SSC General Awareness Topic Wise Solved Papers – General Science
1. A concave lens always forms an image which is (SSC CGL 1st Sit. 2010)
(a) real and erect
(b) virtual and erect
(c) real and inverted
(d) virtual and inverted
2. A vitamin requires cobalt for its activity. The vitamin is (SSC CGL 1st Sit. 2010)
(a) Vitamin B12
(b) Vitamin D
(c) Vitamin B2
(d) Vitamin A
3. One of the constituents of tear gas is
4. The modulus of rigidity is the ratio of (SSC CGL 1st Sit. 2010)
(a) longitudinal stress to longitudinal strain
(b) Volume stress to volume strain
(c) shearing stress to shearing strain
(d) tensile stress to tensile strain
5. The propagation of sound waves in a gas involves (SSC CGL 1st Sit. 2010)
(a) adiabatic compression and refraction
(b) isothermal compression and rarefaction
(c) isochoric compression and rarefaction
(d) isobaric compression and rarefaction
6. An atomic clock is based on transitions in (SSC CGL 1st Sit. 2010)
7. Plasma membrane in eukaryotic celle is made up of (SSC CGL 1st Sit. 2010)
8. Which one of the following is also called the ‘power house’ of the cell ? (SSC CGL 1st Sit. 2010)
(a) Golgi body
9. What is the chemical name of vinegar ? (SSC CGL Is Sit. 2010)
(a) Citric acid
(b) Acetic acid
(c) Pyruvic acid
(d) Malic acid
10. Which of the following is not a property of heavy water? (SSC CGL 1 Sit. 2010)
(a) Boiling point of heavy water is lower than that of ordinary water
(b) Density of heavy water is higher than that of ordinary water
(c) Freezing point of heavy water is higher than that of ordinary water
(d) It produces corrosion
11. In which of the following processes energy is released ? (SSC CGL 1st Sit. 2010)
12. Animals living in the tree trunks are known as (SSC CGL Is* Sit. 2010)
13. In input frequency of a full wave rectifier be n, then the output frequency would be (SSC CGL 1st Sit. 2010)
14. Heat transfer horizontally within the atmosphere is called (SSC CGL 1st Sit. 2010)
15. Noise is measured in (SSC CGL 1st Sit. 2010)
16. The bats can fly in the dark because (SSC CGL 1st Sit. 2010)
(a) they can see the objects in darkness
(b) they have weak legs and are likely to be attacked by predators
(c) they generate flashes of light
(d) they generate ultrasonic sound waves
17. What changes will happen to a ball of ice and water kept at exactly zero degree (Celsius? (SSC CGL 1st Sit. 2010)
(a) All ice will melt
(b) All water will become ice
(c) No change will happen
(d) Only some ice will melt
18. The art and science of map making is called (SSC CGL 2nd Sit. 2010)
(a) Remote Sensing
19. Silver halides are used in photographic plates because they are (SSC CGL 2nd Sit. 2010)
(a) oxidised in air
(b) soluble in hyposolution
(c) reduced by light
(d) totally colourless
20. Tetra ethyle lead (TEL) is (SSC CGL 2nd Sit. 2010)
(a) a catalyst used in burning fossil fuel
(b) an antioxidant
(c) a reductant
(d) an antiknock compound
21. Curie point is the temperature at which (SSCCGL 2nd Sit. 2010)
(a) Matter becomes radioactive
(b) A metal loses magnetic properties
(c) A metal loses conductivity
(d) Transmutation of metal occurs.
22. The isotope used for the production of atomic energy is (SSC CGL 2nd Sit. 2010)
23. The acceleration due to gravity at the equator (SSC CGL 2nd Sit. 2010)
(a) is less than that at the poles
(b) is greater than that at the poles
(c) is equal to that at the poles
(d) does not depend on the earth’s centripetal acceleration
24. Which of the following is not a nucleon ? (SSC CGL 2nd Sit. 2010)
25. The material used in the manufacture of lead pencil is (SSC CGL 2nd Sit. 2010)
26. Angle of friction and angle of repose are (SSC CGL 2nd Sit. 2010)
(a) equal to each other
(b) not equal to each other
(c) proportional to each other
(d) None of the above
27. What happens to a person who receives the wrong type of blood? (SSC CGL 2nd Sit. 2010)
(a) All the arteries constrict
(b) All the arteries dialate
(c) The RBCs agglutinate
(d) The spleen and lymph nodes deteriorate
28. If all bullets could not be removed from gun shot injury of a man, it may cause poisoning by (SSC CGL 2nd Sit. 2010)
29. Ringworm is a disease. (SSCCGL 2nd Sit. 2010)
30. Pituitary gland is situated in (SSC CGL 2nd Sit. 2010)
(a) the base of the heart
(b) the base of the brain
(c) the neck
(d) the abdomen
31. Saliva helps in the digestion of (SSC CGL 1st Sit. 2011)
32. The longest bone in the human body is (SSC CGL Is Sit. 2011)
33. The time period of a pendulum when taken to the Moon would (SSC CGL 1st Sit. 2011)
(a) remain the same
(c) become zero
34. The function of ball bearings in a wheel is (SSC CGL 1st Sit. 2011)
(a) to increase friction
(b) to convert kinetic friction into rolling friction
(c) to convert static friction into kinetic friction
(d) just for convenience
35. ‘Shock-absorbers’ are usually made of steel as it (SSC CGL 1st Sit. 2011)
(a) is not brittle
(b) has lower elasticity
(c) has higher elasticity
(d) has no ductile property
36. Which of the following could be used as fuel in propellant of rockets? (SSC CGL Is* Sit. 2011)
(a) Liquid Hydrogen + Liquid Nitrogen
(b) Liquid Oxygen + Liquid Argon
(c) Liquid Nitrogen + Liquid Oxygen
(d) Liquid Hydrogen + Liquid Oxygen
37. The addition of gypsum to portland cement helps in (SSC CGL 1st Sit. 2011)
(a) increasing the strength of cement
(b) rapid setting of cement
(c) preventing rapid setting of cement
(d) reduction in the cost of cement
38. White lung disease is prevalent among the workers of (SSC CGL 1st Sit. 2011)
(a) Paper industry
(b) Cement industry
(c) Cotton industry
(d) Pesticide industry
39. Iodoform is used as an (SSC CGL 1st Sit. 2011)
40. An artificial ecosystem is represented by (SSC CGL 1st Sit. 2011)
(a) pisciculture tank
(b) agricultural land
41. The constituent of automobile exhaust that can cause cancer is (SSC CGL 1st Sit. 2011)
(a) Oxides of nitrogen
(b) Carbon monoxide
(c) Polycyclic hydrocarbons
42. The optimum dissolved oxygen level (in mg/litre) required for survival of aquatic organisms is (SSC CGL 1st Sit. 2011)
43. The world’s only floating national park is situated in (SSC CGL 1st Sit. 2011)
(b) Kuala Lumpur
44. Who invented vaccination for ‘Small Pox’? (SSC CGL 2nd Sit. 2011)
(a) Sir Fredrick Grant Banting
(b) Sir Alexander Fleming
(c) Edward Jenner
(d) Louis Pasteur
45. BT seed is associated with (SSC CGL 2nd Sit. 2011)
(d) Oil seeds
46. Which of the following minerals is found in Monazite sand? (SSC CGL 2nd Sit. 2011)
47. In coriander, the useful parts are (SSC CGL 2nd Sit. 2011)
(a) roots & leaves
(b) leaves & flowers
(c) leaves & dried fruits
(d) flowers & dried fruits
48. Which plant is called Herbal Indian Doctor? (SSC CGL 2nd Sit. 2011)
49. The pH of human blood is (SSC CGL 2nd Sit. 2011)
50. Which amongst the following is the largest endocrine gland in the body? (SSC CGL 2nd Sit. 2011)
51. Which amongst the following is the largest mammal? (SSC CGL 2nd Sit. 2011)
52. Which part is modified as the tusk of elephant? (SSC CGL 2nd Sit. 2011)
(c) Second incisor
53. Optical fibres are based on the phenomenon of (SSC CGL 2nd Sit. 2011)
(d) Total Internal Reflection
54. Now-a-days yellow lamps are frequently used as street lights. Which of the following gases is used in these lamps? (SSC CGL 2nd Sit. 2011)
55. ‘Mirage’ is an example of (SSC CGL 2nd Sit. 2011)
(a) refraction of light only
(b) total internal reflection of light only
(c) refraction and total internal reflection of light
(d) dispersion of light only
56. The phenomenon of light associated with the apprearance of blue colour of the sky is (SSC CGL 2nd Sit. 2011)
57. Lens is made up of (SSC CGL 2nd Sit. 2011)
(a) Pyrex glass
(b) Flint glass
(c) Ordinary glass
(d) Cobalt glass
58. The element used for vulcanizing rubber is (SSC CGL 2nd Sit. 2011)
59. Which of the following is responsible for the extra strength of pyrex glass? (SSC CGL 2nd Sit. 2011)
(a) Potassium Carbonate
(b) Lead Oxide
(d) Ferric Oxide
60. The noble gas used for the treatment of cancer is (SSC CGL 2nd Sit. 2011)
61. Fertilization occurs normally in the (SSC CGL 1st Sit. 2012)
(c) Fallopian tube
62. People consuming alcohol in heavy quantities generally die of (SSC CGL 1st Sit. 2012)
(a) liver or stomach cancer
(b) weakening of heart muscles leading to cardiac arrest
(c) blood cancer
63. The organisms at the base of the grazing food-chain are (SSC CGL 1st Sit. 2012)
64. The mass of 10 moles of water is (SSC CGL 1st Sit. 2012)
(a) 90 g
(b) 45 g
(c) 18 g
65. Vitamin Ais rich in (SSC CGL 1st Sit. 2012)
66. The high boiling point of water compared to hydrogen sulphide or hydrogen chloride is due to (SSC CGL 1st Sit. 2012)
(a) Dipole insulation
(b) Van der Waal’s attraction
(c) Polar covalent bonding
(d) Hydrogen bonding
67. Which of the following determines the chemical properties of an element? (SSC CGL Is* Sit. 2012)
(a) Number of electrons
(b) Number of neutrons
(c) Number of projons
(d) All of the above
68. ‘Lumen’ is the unit of (SSC CGL 1st Sit. 2012)
(c) Luminous flux
(d) Luminous intensity
69. Which one of the following forces is a ‘dissipative force’? (SSC CGL 1st Sit. 2012)
(a) Electrostatic force
(b) Magnetic force
(c) Gravitational force
(d) Frictional force
70. If a resistive wire is elongated, its resistance (SSC CGL 1st Sit. 2012)
(b) remains constant
(d) All of the above
71. If a magnet has a third pole, then the third pole is called (SSC CGL 1st Sit. 2012)
(a) defective pole
(b) consequent pole
(c) extra pole
(d) arbitrary pole
72. The sweet taste of fruits is due to (SSC CGL 1st Sit. 2012)
73. Which is NOT a correct statement? (SSC CGL 2nd Sit. 2012)
(a) Phenols are acidic
(b) In benzene all the atoms lie in one plane
(c) Methylated spirit contains only methanol
(d) Dilute solutions contain less amount of solute
74. The infective stage of Malaria is (SSC CGL 2nd Sit. 2012)
(b) Ring stage
75. Which of the following is meant for the ex-situ conservation of various species? (SSC CGL 2nd Sit. 2012)
(a) Sperm bank
(b) Blood bank
(c) Germplasm bank
76. An algae type ocean deposit is (SSC CGL 2nd Sit. 2012)
(a) Neritic remains
(b) Diatom Ooze
(c) Pteropod Ooze
(d) Pelagic deposits
77. Photosynthetic vesicle found in bacteria is called a (SSC CGL 2nd Sit. 2012)
78. What type of mirror is used in a view finding mirror of a vehicle? (SSC CGL 2nd Sit. 2012)
(a) Convex mirror
(b) Plane mirror
(c) Concave mirror
(d) Paraboloidal mirror
79. Pyroligneous acid obtained from wood contains (SSC CGL 2nd Sit. 2012)
(a) 10% Formaldehyde
(b) 10% Acetic acid
(c) 10% Formic acid
(d) 10% ethanol
80. Union Carbide India Ltd. manufactured essentially (SSC CGL 2nd Sit. 2012)
(a) Heavy water
(d) Leather goods
81. Drying oils contain a fairly large proportion of
(a) Unsaturaled fatty acids (SSC CGL 2nd Sit. 2012)
(d) Saturated fatty acids
82. The red, orange and yellow colours of leaves are due to (SSC CGL 2nd Sit. 2012)
83. We receive sunlight on earth surface. What type of light beams are these? (SSC CGL 2nd Sit. 2012)
84. Polar-bears hold cures for (SSC CGL 2nd Sit. 2012)
(a) Type II diabetes
(d) Kidney failure
85. Which colour/colours of light has the highest velocity through vacuum? (SSC CGL 2nd Sit. 2012)
(d) All of the above
86. The ultimate source of energy in a hydroelectric power station is (SSC CGL 2nd Sit. 2012)
(a) solar energy
(b) the potential energy of water
(c) the kinetic energy of water
(d) the electro-chemical energy of water
87. The disease that kills more people than lung cancer as a consequence of air pollution is (SSC CGL 2nd Sit. 2012)
(a) chronic bronchitis
(d) heart attack
88. Which of the following pairs is correctly matched? (SSC CGL 2nd Sit. 2012)
(a) Milk of lime-sodium sulphate
(b) Glauber’s salt-calcium sulphate
(c) Salt petre-potassium nitrate
(d) Gypsum-calcium hydroxide
89. ‘Eutrophication’ is associated with (SSC CGL 1st Sit. 2012)
(a) nitrates and phosphates
(c) silt load
90. The best way to maintain a natural equilibrium between the pest and predator is by using (SSC CGL 1st Sit. 2012)
(b) biological control
91. ‘Dry ice’ is the condensed form of (SSC CGL 1st Sit. 2012)
(a) sulphur tri-oxide
(b) carbon dioxide
(c) highly cooled water
92. The materials which are strongly attracted by magnet are called (SSC CGL Is* Sit. 2012)
(a) ferro-magnetic substances
(b) universal substances
(c) para-magnetic substances
(d) dia-magnetic substances
93. In a pin-hole camera, we usually get (SSC CGL 1st Sit. 2012)
(a) erect impression
(b) inverted impression
(c) erect image
(d) inverted image
94. What happens to the kinetic energy of gas molecules with rise of temperature ? (SSC CGL 1st Sit. 2012)
(a) Remains same
95. The sex of a child is determined (SSC CGL 1st Sit. 2012)
(a) six to seven weeks after conception
(b) in the third month of pregnancy
(c) at the time of sperm’s entry
(d) at the time of fertilisation of ovum
96. The food chain of the ecosystem is maintained by the activities of (SSC CGL 1st Sit. 2012)
97. Which one of these primates is closest to the modem man ? (SSC CGL 1st Sit. 2012)
98. A gram of fertile agricultural soil may contain bacteria upto (SSC CGL 1st Sit. 2012)
(a) five million
(b) one billion and above
(c) fifty thousand
(d) five hundred thousand
99. A reduction reaction involves (SSC CGL 1st Sit. 2012)
(a) addition of oxygen
(b) addition of nitrogen
(c) addition of hydrogen
(d) None of the above
100. An antiknock for petrol is (SSC CGL 1st Sit. 2012)
(a) sodium hydroxide
(c) sodium benzoate
(d) lead tetraethyl
101. Which one of the following pairs is not correctly matched ? (SSC CGL 1st Sit. 2012)
(a) Vitamin C – Scurvy
(b) Vitamin K – Clotting of blood
(c) Vitamin A – Night blindness
(d) Vitamin E – Rickets
102. The fibre that will yield ammonia when destructively distilled is (SSC CGL 1st Sit. 2012)
(b) cellulose acetate
103. During respiration, energy is derived from (SSC CGL 1st Sit. 2012)
104. When was a global network of daily temperature records created ? (SSC CGL 1st Sit. 2012)
(a) Around 1890
(b) Around 1920
(c) Around 1800
(d) Around 1850
105. Sex hormones are (SSC CGL 1st Sit. 2012)
106. A form of condensation that reduces visibility and causes breathing problems is (SSC CGL 2nd Sit 2012)
107. Green glands are associated with (SSC CGL 2nd Sit. 2012)
108. During respiration, the gases enter into the blood and leave the same by the process of (SSC CGL 2nd Sit 2012)
(a) active transport
(c) diffusion and active transport
109. Heart is devoid of (SSC CGL 2nd Sit. 2012)
(a) cardiac muscle
(b) involuntary muscle
(c) voluntary muscle
(d) smooth muscle
110. The soil salinity is measured by (SSC CGL 2nd Sit. 2012)
(a) conductivity meter
111. Which of the following is a fungal disease? (SSC CGL 2nd Sit. 2012)
112. Chickenpox is caused by (SSC CGL 2nd Sit. 2012)
(a) DNA virus
(b) Variola virus
(d) Vibrio cholerae
113. Instruments can be shielded from outside magnetic effects by surrounding them with (SSC CGL 2nd Sit. 2012)
(a) iron shield
(b) rubber shield
(c) brass shield
(d) glass shield
114. Find the odd one. (SSC CGL 2nd Sit. 2012)
(d) Slaked lime
115. The following is a pseudo-force: (SSC CGL 2nd Sit. 2012)
(a) Centrepetal force
(b) Centrifugal reaction force
(c) Centrifugal force
(d) Strong nuclear force
116. The hydraulic brake used in automobiles is a direct application of (SSC CGL 2nd Sit. 2012)
(a) Archimedes’ principle
(b) Torricellean law
(c) Bernoulli’s Theorem
(d) Pascal’s law
117. Amides can be converted to amines by the reaction named (SSC CGL 2nd Sit. 2012)
118. The base used as an antacid is (SSC CGL 2nd Sit. 2012)
(a) calcium hydroxide
(b) barium hydroxide
(c) magnesium hydroxide
(d) silver hydroxide
119. A process which is not helpful in the prevention of rusting of iron is (SSC CGL 2nd Sit. 2012)
(b) applying grease
120. Denatured alcohol (SSC CGL 2nd Sit. 2012)
(a) is a form of alcohol
(b) is unfit for drinking as it contains poisonous substances
(c) contains coloured impurities
(d) is sweet to taste
121. Phenolics as pollutants can be removed from waste water by use of (SSC CGL 2nd Sit. 2012)
(a) ion exchange resin technique
(b) electrolyte decomposition technique
(c) reverse osmosis method
(d) polymeric adsorbents
122. The stability of a pond ecosystem depends on (SSC CGL 2nd Sit. 2012)
(a) micro-organisms and fishes
(b) micro-organisms and zoo planktons
(c) fishes and reptiles
(d) producers and consumers
123. Supersonic air planes create a shock wave called (SSC CGL 2nd Sit. 2012)
(a) transition wave
(c) transverse wave
(d) sonic boom
124. The danger signals are red while the eye is more sensitive to yellow because (SSC CGL 2nd Sit. 2012)
(a) absorption in red is less than yellow and hence red is visible from a distance
(b) scattering in yellow light is less than red
(c) the wavelength of red light is more than yellow light
(d) none of the above reasons
125. Transboundary pollution (or) Acid rain is caused by (SSC CGL 1st Sit. 2013)
(a) nitrogen oxide and sulphur dioxide
(b) carbon monoxide
(c) carbon dioxide
126. Which of the following is an endemic species? (SSC CGL 1st Sit. 2013)
(a) Nicobar pigeon
(b) Horn bill
(c) Indian Rhino
(d) Pink head duck
127. The natural disaster in which carbon-di-oxide suddenly erupts from a deep lake water is known as (SSC CGL 1st Sit. 2013)
128. Blood group was discovered by
(a) Alexander Fleming
(b) William Harvey
129. Pick out the correct match : (SSC CGL 1st Sit. 2013)
(a) Egg yolk Protein and Fat
(b) Fleshy foods Calcium and Protein
(c) Fish Starch and Vitamin
(d) Milk Fibre and Minerals
130. Blood is a (SSC CGL 1st Sit. 2013)
(a) reproductive tissue
(b) connective tissue
(c) epithelial tissue
(d) muscular tissue
131. DPT vaccine is administered to prevent diseases like (SSC CGL 1st Sit. 2013)
(a) Diphtheria, Pertussis and Typhoid
(b) Diphtheria, Pertussis and Tetanus
(c) Dengue, Pertussis and Typhoid
(d) Dengue, Polio and Tetanus
132. The disease that has been eradicated from the world, is: (SSC CGL 1st Sit. 2013)
(d) Chicken pox
133. In dicots the pollen grains possess : (SSC CGL 1st Sit. 2013)
(a) one germ pore
(b) two germ pores
(c) three germ pores
(d) four germ pores
134. ‘Farad’ is the unit of: (SSC CGL 1st Sit. 2013)
135. Steel is more elasitc than rubber because it: (SSC CGL 1st Sit. 2013)
(a) is harder than rubber
(b) requires larger deforming force
(c) is never deformed
(d) is deformed very easily
136. Identify the odd term amongst the following group : (SSC CGL 1st Sit. 2013)
(a) Coaxial cable
(b) Optical fibre
(c) Twisted pair wire
137. Stains of rust on clothes can be removed by (SSC CGL Is Sit. 2013)
(b) Oxalic acid
138. The percentage of nitrogen present in ammonium sulphate is: (SSC CGL 1st Sit. 2013)
139. Ethanol containing 5% water is known as (SSC CGL 1st Sit. 2013)
(a) Absolute alcohol
(b) Dilute alcohol
(c) Power alcohol
(d) Rectified spirit
140. The hormone used as an oral contraceptive is (SSC CGL 1st Sit. 2013)
141. Expand the term IPCC: (SSC CGL 1st Sit. 2013)
(a) International Pollution Control Council
(b) International Panel of Climate Control
(c) Interim Panel of Climate Change
(d) Intergovernmental Panel on Climate Change
142. Acceptable “Noise Pollution Level” in India range between: (SSC CGL 1st Sit. 2013)
(a) 10-15 dec
(b) 16-35 dec
(c) 40-45 dec
(d) 70-100 dec
143. Endosulfan spray on cashew crop resulted in the pollution to the tune of tragedy in : (SSC CGL 1st Sit. 2013)
(a) Tamil Nadu
(c) Andhra Pradesh
144. Hypothensmia occurs due to loss of excessive heat from body due to sudden low body temperature in : (SSC CGL 1st Sit. 2013)
(c) Human beings
145. Solids which conduct electricity at higher temperature but not at lower temperature are called (SSC CGL 2nd Sit. 2013)
146. Which one of the following has greatest mass? (SSC CGL 2nd Sit. 2013)
(d) hydrogen nucleus
147. A television channel is characterised by (SSC CGL 2nd Sit. 2013)
(a) frequency of transmitted signal
(b) velocity of transmitted signal
(c) physical dimension of television screen
(d) size of picture tube
148. The density of water is 1 g/cc. This is strictly valid at (SSC CGL 2nd Sit. 2013)
(a) (PC ‘
149. The process of photosynthesis involves conversion of (SSC CGL 2nd Sit. 2013)
(a) chemical energy into radiant energy
(b) chemical energy into mechanical energy
(c) solar energy into chemical energy
(d) mechanical energy into solar energy
150. A colloidal system in which a liquid is dispersed in a liquid is called (SSC CGL 2nd Sit. 2013)
151. The antiseptic compound present in dettol is. (SSC CGL 2nd Sit. 2013)
152. Genomic (DNA) studies in camel have been completed recently by the scientists of (SSC CGL 2nd Sit 2013)
(a) South Africa
153. Air quality depicting PM 2.5 is more hazardous to (SSC CGL 2nd Sit. 2013)
(a) Archaeological Monuments
(b) National Parks
(c) Botanical Gardens
(d) Old Men and Women
154. Piped Natural Gas (PNG) is used for (SSC CGL 2nd Sit. 2013)
155. Greenpark Stadium is in (SSC CGL 2nd Sit. 2013)
156. Which of the following is an endangered species? (SSC CGL 2nd Sit. 2013)
(a) Black buck
(b) Blue sheep
(c) Gangetic dolphin
157. Of the following man-made disasters, which is socially induced? (SSC CGL 2nd Sit. 2013)
(a) Debris Avalanche
(b) Salt Water Intrusion
(d) Ozone depletion
158. Which one of the following endocrine gland is situated in the neck? (SSC CGL 2nd Sit. 2013)
159. The seat of intelligence is situated in the (SSC CGL 2nd Sit. 2013)
160. What is the Normal Blood Volume in human adult? (SSC CGL 2nd Sit. 2013)
(a) One litre
(b) Three litres
(c) Five litres
(d) Seven litres
161. The fasting blood glucose level in adults in mg/100 ml is (SSC CGL 2nd Sit. 2013)
162. Entomology is the study of (SSC CGL 2nd Sit. 2013)
163. Exobiology is a science that deals with (SSC CGL 2nd Sit. 2013)
(a) extinct forms
(b) life in other planets
(c) life in the outer space
(d) life in marine habitat
164. In radio-communication, the signals emitted by transmitting antenna are reflected on (SSC CGL 2nd Sit. 2013)
165. Tiny marine animals which constitute limestone skeletons are called (SSC CGL 1st Sit. 2013)
(a) Coral reefs
166. Which of the following plant pigments absorbs in red and far-red region of light? (SSC CGL 1st Sit. 2013)
167. The process through which excess of light energy is dissipated in photosynthesis is known as (SSC CGL 1st Sit. 2013)
168. AIDS virus destroys (SSC CGL 1st Sit. 2013)
169. The device used for measuring the wavelength of X-rays is (SSC CGL 1st Sit. 2013)
(a) Bragg Spectrometer
(b) Mass Spectrometer
(c) G M. Counter
170. Alpha particle is the nucleus of an atom of (SSC CGL 1st Sit. 2013)
171. Teeth and Bones acquire strength and rigidity from (SSC CGL 1st Sit. 2013)
172. The type of tail found in Shark is (SSC CGL 1st Sit. 2013)
173. The Sigmoid Colon is part of (SSC CGL 1st Sit. 2013)
(a) large intestine
(c) small intestine
(d) anal canal
174. A good conductor while carrying current is (SSC CGL 1st Sit. 2013)
(a) positively charged
(b) electrically neutral
(c) alternately charged positive and negative
(d) negatively charged
175. Coating of solid waste with impervious material is known as (SSC CGL 1st Sit. 2013)
(d) chemical fixation
176. Ultraviolet rays can-foe used in water treatment as (SSC CGL 1st Sit. 2013)
177. Thiamidine dimer formation in DNA is caused by (SSC CGL 1st Sit. 2013)
178. Silicone is a polymer of (SSC CGL 1st Sit. 2013)
(a) Dialkyl dichloro silane
(c) Tetraalkyl silane
(d) Silicon tetrachloride
179. Which is a natural colloid? (SSC CGL Is* Sit. 2013)
(c) Sodium chloride
180. Which one of the following does not contain Silver? (SSC CGL 1st Sit. 2013)
(a) German Silver
(b) Horn Silver
(c) Ruby Silver
(d) Lunar Caustic
181. T he presence of Cobalt in Vitamin B12 was revealed for the first time by (SSC CGL 1st Sit. 2013)
(a) Borax-Bead test
(b) Sodium Nitroprusside test
(c) Hydrolysis test
182. Which bacterial strain developed from natural isolates by genetic manipulations can be used for treating oil spills? (SSC CGL 1st Sit. 2013)
183. Reduction of nitrates to ammonia can be achieved through one of the following methods: (SSC CGL 1st Sit. 2013)
(a) in alkaline medium using Devarda’s alloy.
(b) in neutral medium using Devarda’s alloy.
(c) in acidic medium using Devarda’s alloy.
(d) in neutral medium using Cupric oxide.
184. Grits of sewage are removed in (SSC CGL 1st Sit. 2013)
(a) Grit chamber
(b) Detritus tank
(c) Skimming tank
(d) Trickling filter
185. The most affected sulphur containing amino acid by PAN is (SSC CGL 1st Sit. 2013)
186. Which of the following has zero electron affinity ? (SSC CGL 1st Sit. 2013)
187. The human body’s largest blood vessel is (SSC CGL 1st Sit. 2013)
(a) Pulmonary artery
(c) Renal artery
(d) Coronary artery
188. In human body, which one of the following hormones regulates blood calcium and phosphate ? (SSC CGL 1st Sit. 2013)
(b) Growth hormone
(c) Parathyroid hormone
189. How do most insects respire ? (SSC CGL 1st Sit. 2013)
(a) Through skin
(b) Through gills
(c) By tracheal system
(d) By lungs
190. In nuclear reactions, there is conservation of (SSC CGL 1st Sit. 2013)
(a) mass only
(b) momentum only
(c) energy only
(d) mass, energy and momentum
191. When a particle and an antiparticle come in contact with each other, they (SSC CGL 1st Sit. 2013)
(a) repell each other
(b) annihilate each other
(c) go undisturbed
(d) spin about a common axis
192. Photoelectric effect is (SSC CGL Is Sit. 2013)
(a) an instantaneous process
(b) delayed process
(c) emission of protons
(d) emission of neutrons
193. For a particle moving with a constant speed along a straight line PQ, the hodograph is (SSC CGL 1st Sit. 2013)
(a) a straight line parallel to PQ
(b) a straight line perpendicular to PQ
(c) a point
(d) a circle
194. Aluminium is obtained by the electrolysis of pure A1203 dissolved in (SSC CGL 1st Sit. 2013)
195. Complete hydrolysis of cellulose gives (SSC CGL 1st Sit. 2013)
196. Each body segment of Earthworm is called (SSC CGL 1st Sit. 2013)
197. The pollutants which move downward with percolating ground water are called (SSC CGL 1st Sit. 2013)
198. Lungs are located in the (SSC CGL 1st Sit. 2013)
(a) abdominal cavity
(b) pericardial cavity
(c) peritoneal cavity
(d) pleural cavity
199. Which one of the following is the ideal food for newborn babies? (SSC CGL 1st Sit. 2013)
200. Transcription means the synthesis of (SSC CGL 1st Sit. 2013)
201. Hydrochloric acid is secreted by the cells lining the (SSC CGL 1st Sit. 2013)
(a) Oral cavity
202. Emulsification is (SSC CGL 1st Sit. 2013)
(a) breaking fats into small globules
(b) digestion of fats
(c) absorption of fats
(d) storage of fats
203. Taxonomy is a science that deals with (SSC CGL 1st Sit. 2013)
(d) Economic uses
204. Which of the following is responsible for the working of Newton’s colour disc experiment? (SSC CGL 1st Sit. 2013)
(a) Formation of pure spectra
(b) Formation of impure spectra
(c) Persistence of vision
(d) Principle of complementary colour
205. The dimension MLT-2 corresponds to (SSC CGL 1st Sit. 2013)
(b) work done
206. Who is the founder of quantum theory of radiation? (SSC CGL 1st Sit. 2013)
(d) S.N. Bose
207. Fiber optics cable used in communication, works on the principle of (SSC CGL 1st Sit. 2013)
(a) regular reflection of light
(b) diffuse reflection of light
(c) refraction of light
(d) total internal reflection of light
208. The outer skin most of the crustaceans are made up of a carbohydrate. This carbohydrate is (SSC CGL 1st Sit. 2013)
209. Rutherford’s scattering experiment proved the presence of (SSC CGL 1st Sit. 2013)
(a) atoms in all matter
(b) electrons in atoms
(c) neutrons in atoms
(d) nucleus in atoms
210. When a metal is heated in a flame, the electrons absorb energy and jump to higher energy state. On coming back to the lower energy state, they emit light, which we can observe in (SSC CGL 1st Sit. 2013)
(a) Raman spectra
(b) Absorption spectra
(c) Emission spectra
211. Blood pressure may be increased by the excessive secretion of (SSC CGL 1st Sit. 2013)
212. The Concept of ‘Green House Gases” was postulated by (SSC CGL 1st Sit. 2013)
(a) Joseph Fourier
(b) Abdul Kalam
(c) M. S. Swaminathan
(d) Richael Carlson
213. “Bhopal gas tragedy” 1984 is related to (SSC CGL 1st Sit. 2013)
(a) Aluminium Phosphide
(b) Methyl bromide
(c) Methyl isocyanate
(d) Carbon dioxide
214. The Particulate Matter (PM-10) exhaled from the polluted atmosphere is often filtered out during the process of (SSC CGL 1st Sit. 2013)
(c) A and B
215. The animal who can consume more salt among the following is (SSC CGL 1st Sit. 2013)
216. Cactus is referred to as (SSC CGL 2014)
217. Which of the following is not a renewable resource? (SSC CGL 2014)
(b) Geothermal heat
(c) Tidal power
(d) Radiant energy
218. How many neck canal cells are found in the archegonium of a fern? (SSC CGL 2014)
219. Which angiosperm is vesselless? (SSC CGL 2014)
220. Who was the first child bom after operative procedure? (SSC CGL 2014)
221. Myrmecology is study of (SSC CGL 2014)
222. HIV often changes is shapes due to the presence of an enzyme called (SSC CGL 2014)
(a) Reverse Transcriptase
223. Fleming’s right hand rule is used to find the direction of the (SSC CGL 2014)
(a) Alternate current
(b) Direct current
(c) Induced current
(d) Actual current
224. The unit of electrical power is (SSC CGL 2014)
(c) Kilowatt hour
225. The resistance of the human body (dry condition) is of the order of (SSC CGL 2014)
(a) 101 Ohm
(b) 102 Ohm
(c) 103 Ohm
(d) 104 Ohm
226. Certain substances loose their electrical resistance completely at super low temperature. Such substances are called (SSC CGL 2014)
(a) super conductors
(b) semi conductors
(d) perfect conductors
227. Brass contains (SSC CGL 2014)
(a) Copper and Zinc
(b) Copper and Tin
(c) Copper and Silver
(d) Copper and Nickel
228. Which is the purest commercial form of iron? (SSC CGL 2014)
(a) Pig iron
(c) Stainless steel
(d) Wrought iron
229. In galvanization, iron is coated with (SSC CGL 2014)
230. Which one of the following is also known as solution? (SSC CGL 2014)
(a) A compound
(b) A homogeneous mixture
(c) A heterogeneous mixture
(d) A suspension
231. The cells which are closely associated and interacting with guard cells are (SSC CGL 2014)
(a) Transfusion tissue
(b) Complementary cells
(c) Subsidiary cells
(d) Hypodermal cells
232. Conversion of starch to sugar is essential for (SSC CGL 2014)
(a) Stomatal opening
(b) Stomatal closing
(c) Stomatal formation
(d) Stomatal growth
233. Which of the following Genetically Modified vegetable is recently being made available in Indian market? (SSC CGL 2014)
234. Electric current is measured using which of the following instrument ? (SSC CGL 1st Sit. 2015)
235. Photoperiodism affects (SSC CGL 1st Sit. 2015)
(b) vegetative growth
(d) all of thease
236. Match the following: (SSC CGL 1st Sit. 2015)
237. Allantois of Embryo helps in (SSC CGL Sit. 2015)
239. Outside the nucleus DNA is found in (SSC CGL 1st Sit. 2015)
(c) Endoplasmic reticulum
(d) Golgi bodies
240. Animal protein is called first class protein because it is (SSC CGL 1St Sit. 2015)
(a) delicious in taste
(b) cheaper in the market
(c) rich in essential amino acids
(d) easily digestible
241. It is easy to burst a gas filled balloon with a needle than with a nail. It is because (SSC CGL Pt Sit. 2015)
(a) nail exerts more pressure than needle on the balloon
(b) needle exerts more pressure than nail on the balloon
(c) gas is reactive with the needle
(d) nail is more longer than needle
242. The velocity of sound in moist air is more than in dry air
because the moist air has (SSC CGL 1st Sit. 2015)
(a) less pressure than dry air
(b) more pressure than dry air
(c) more density than dry air
(d) less density than dry air
243. X-rays can be used (SSC CGL 1st Sit. 2015)
(a) to detect heart diseases.
(b) to detect defects in precious stones and diamonds.
(c) to detect gold under the earth.
(d) for cutting and welding of metals.
244. Ice is packed in saw dust because (SSC CGL 1st Sit. 2015)
(a) saw dust is poor conductor of heat.
(b) saw dust is a good conductor of heat.
(c) saw dust does not stick to the ice.
(d) saw dust will not get melted easily.
245. What happens when a drop of glycerol is added to crushed KMn04 spread of a paper ? (SSC CGL 1st Sit. 2015)
(a) There is a violent explosion
(b) There is no reaction
(c) The paper ignites
(d) There is a crackling sound.
246. Most commonly used bleaching agent is (SSC CGL 1st Sit. 2015)
(b) Carbon dioxide
(d) Sodium chloride
247. The least penetrating power ray is (SSC CGL 1st Sit. 2015)
248. Hydrogen peroxide is an effective sterilizing agent. Which one of the following product results when it readily loses active oxygen ? (SSC CGL 1st Sit. 2015)
(d) Nasant Hydrogen
249.The maximum fixation of solar energy is done by (SSC CGL 1st Sit. 2015)
(c) Green plants
250. The term ‘brown air’ is used for (SSC CGL 1st Sit. 2015)
(a) Photochemical smog
(b) Sulfurous smog
(c) Industrial smog
(d) Acid fumes
251. Peroxyacetyl nitrate is a (SSC CGL 1st Sit. 2015)
(a) Plant hormone
(c) Secondary pollutant
(d) Acidic dye
252. Which of the following particles has the dual nature of particle-wave ? (SSC CGL 1st Sit. 2015)
253. The metal ion present in vitamin B j 2 is (SSC CGL 1st Sit. 2015)
254. Who of the following has given the term rhizosphere (SSC CGL 1st Sit. 2015)
(d) None of the given options
255. Reverse transcription was discovered by (SSC CGL 1st Sit. 2015)
(a) Beadle and Tatum
(b) Watson and Crick
(c) Temin and Baltimore
(d) Har Govind Khorana
256. Burns caused by steam are much more severe than those caused by boiling water because: (SSC CGL 1st Sit. 2015)
(a) Steam pierces through the pores of body quickly
(b) Temperature of steam is higher
(c) Steam is gas and engulfs the body quickly
(d) Steam has latent heat
257. Which among the following is the sweetest sugar? (SSC CGL 1st Sit. 2015)
258. Ultra purification of a metal is done by: (SSC CGL 1st Sit. 2015)
(c) zone melting
259. Microbial degradation of nitrates into atmospheric nitrogen is known as: (SSC CGL 1st Sit. 2015)
260. The best milch breed in the world is : (SSC CGL 1st Sit. 2015)
261. Muddy water is treated with alum in purification process, it is termed as: (SSC CGL 1st Sit. 2015)
262. An enzyme produced by HIV that allows the integration of HTV DNA into the host cell’s DNA is: (SSC CGL 1st Sit. 2015)
(a) DNA gyrase
263. The two specific heats of gases are related by : (SSC CGL 1st Sit. 2015)
(a) C / Cv = R
(b) C – Cv = RJ
(c) Cp-CV = R/J
(d) Cp + CV=RJ
264. The antibiotic penicillin is obtained from which of the following ? (SSC CGL 1st Sit. 2016)
(a) synthetic process
(b) a bacterium
(d) virus infected cells
265. Which of the following is indicated by the colour of a star ? (SSC CGL 1st Sit. 2016)
266. Atomic number of an atom gives the number of which of the following ? (SSC CGL 1st Sit. 2016)
(d) neutrons and protons
267. DPT vaccine is categorized as which of the following ? (SSC CGL 1st Sit. 2016)
(a) Anti viral vaccine
(b) Anti protozoan vaccine
(c) Anti rickettsial vaccine
(d) A combined vaccine
268. Which is the highest quality of hard coal? (SSC CGL 1st Sit. 2016)
269. For which one of the following, ‘Diodes’ are generally used for? (SSC CGL 1st Sit. 2016)
270. An anemometer measures which of the following ? (SSC CGL 1st Sit. 2016)
(a) Speed of light
(b) Speed of wind
(c) Speed of water current
(d) Speed of satellites
271. Which cell disorder in our body is responsible for colour blindness? (SSC CGL 1st Sit. 2016)
(b) Cone cell
(c) Rod Cell
272. Which one of the following forms the base of vegetable fibres? (SSC CGL 1st Sit. 2016)
273. A particle is thrown vertically upward. When it reaches the highest point, it has (SSC CGL 1st Sit. 2016)
(a) a downward acceleration
(b) an upward acceleration
(c) a downward velocity
(d) a horizontal velocity
274. During fermentation of sugar, the compound which is always formed is (SSC CGL 1st Sit. 2016)
(a) Methyl Alcohol
(b) Ethyl Alcohol
(c) Acetic Acid
275. The quality or tone of a musical sound produced by a stringed instrument depends on (SSC CGL 1st Sit. 2016)
(a) frequency of vibration
(b) length of the strings in the instrument
(c) Amplitude of vibration
(d) waveform of the sound
276. Removal of carbon particles from air involves the principle of (SSC CGL 1st Sit. 2016)
277. Which light is least effective in photosynthesis? (SSC CGL 1st Sit. 2016)
(a) Blue light
(b) Green light
(c) Red light
278. Which of the following acts as best adsorbent? (SSC CGL 1st Sit. 2016)
(b) Activated Charcoal
(c) Activated Coconut Charcoal
(d) Carbon black
279. The maximum fixation of solar energy is done by (SSC CGL 1st Sit. 2016)
(d) Green plants
280. ‘Parsec’ is the unit measurement of (SSC CGL Is* Sit. 2016)
(a) Density of stars
(b) Astronomical distance
(c) Brightness of heavenly bodies
(d) Orbital velocity of giant stars
281. At room temperature, the metal that remains liquid is: (SSC CGL 1st Sit. 2016)
282. Which is known as carbolic acid? (SSC CGL 1st Sit. 2016)
(c) Acetic acid
(d) Oxalic acid
283. Which one of the following substances is normally found in urine? (SSC CGL 1st Sit. 2016)
(a) Blood proteins
(c) Red blood cells
(d) White blood cells
284. The thymus gland produces a hormone called (SSC CGL 1st Sit. 2016)
285. Blood group AB has (SSC CGL Is* Sit. 2016)
(a) No antigen
(b) No antibody
(c) Neither antigen nor antibody
(d) Both antigen and antibody
286. Which vitamins are those, if taken in excess can be dangerous as they are stored in the body? (SSC CGL 1st Sit. 2016)
(a) B Complex
287. Atomic explosion is triggered by (SSC CGL 1st Sit. 2016)
(a) thermo nuclear reaction
(b) chemical reaction
(c) controlled chain reaction
(d) uncontrolled chain reaction
288. The phenomenon of change in direction of light when it passes from one medium to another is called (SSC CGL 1st Sit. 2016)
289. When ice cubes are made, the entropy of water (SSC CGL 1st Sit. 2016)
(a) does not change
(d) may either increase or decrease depending on the process used
290. Two vectors are said to be equal if (SSC CGL 1st Sit. 2016)
(a) only their magnitudes are same
(b) only their directions are same
(c) both magnitude and direction are same
(d) magnitudes are same but directions are opposite
291. The chemical component that is invariably found in all viruses is (SSC CGL 1st Sit. 2016)
292. Which is used as an Air pollution indicator? (SSC CGL 1st Sit. 2016)
293. Salination of soil is caused by (SSC CGL 1st Sit. 2016)
(b) soil erosion
(c) excess irrigation
(d) crop rotation
294. Which enzyme digests proteins in the stomach? (SSC CGL 1st Sit. 2016)
(c) Salivary amylase
(d) Pancreatic canal
295. Fermentation is a type of process. (SSC CGL 1st Sit. 2016)
(a) Aerobic Respiration
(b) Anaerobic Respiration
(c) Exothermic Reaction
296. Which part of the plant is used as ‘saffron’? (SSCCHSL 2012)
(c) Style and Stigma
297. Suspended colloidal particles in the water can be removed by the process of: (SSC CHSL 2012)
298. Grave’s disease is caused due to: (SSC CHSL 2012)
(a) hyperactivity of thyroid
(b) hypoactivity of thymus
(c) hypoactivity of thyroid
(d) hyperactivity of thymus
299. A white solid ‘A’ on heating gives offa gas which turns lime water milky. The residue is yellow when hot but turns white on cooling. The solid A is: (SSC CHSL 2012)
(a) Zinc Carbonate
(b) Lead Sulphate
(c) Lead Carbonate
(d) Zinc Sulphate
300. Which of the following is the strongest coagulant ? (SSCCHSL 2012)
(a) Zinc Chloride
(b) Aluminium Chloride
(c) Barium Chloride
(d) Magnesium Sulphate
301. The property which is seen in light wave but not in sound wave is: (SSC CHSL 2012)
302. Iron and manganese are removed in water by the process of: (SSC CHSL 2012)
(c) Lime-soda treatment
303. Which enzyme is obtained from Red gram ? (SSC CHSL 2012)
304. A radioactive substance has a half-life of four months. Three-fourth of the substance will decay in : (SSC CHSL 2012)
(a) 8 months
(b) 12 months
(c) 4 months
(d) 6 months
305. Chiropterophily means: (SSC CHSL 2012)
(a) production of flowers
(b) pollination by wind
(c) pollination by bat
(d) production of leaves
306. Which one among the following is a solid lubricant ? (SSC CHSL 2012)
307. Longest cell in human body is: (SSC CHSL 2012)
(a) Blood cell
(b) bone cell
(c) Nerve cell
(d) muscle cell
308. The acid rain destroys the vegetation because it contains: (SSC CHSL 2012)
(b) Carbon monoxide
(c) Sulphuric acid
309. Activated sludge treatment is called: (SSC CHSL 2012)
(a) Preliminary treatment
(b) Biological treatment
(c) Pre treatment
(d) Chemical treatment
310. Caustic soda is: (SSC CHSL 2012)
311. Red light is used in traffic signal for stopping the traffic because: (SSC CHSL 2012)
(a) eye is more sensitive to red light.
(b) it is least scattered and hence can be easily noticed from long distance.
(c) it is very pleasant to the eye.
(d) it is visible even to longsighted people.
312. What is a neuron? (SSC CHSL 2013)
(a) Basic unit of nervous system
(b) Basic unit of energy
(c) Particle released during radioactivity
(d) The anti-particle of neutron
313. Acellulosjcwall is found in the ceilsof (SSCCHSL 2013)
314. The filtration unit of kidney is (SSCCHSL 2013)
(a) yellow fiber
315. The nutritive tissue in the seeds of higher plants is known as (SSC CHSL 2013)
316. Yeast is an important source of (SSC CHSL 2013)
(b) vitamin B
(d) vitamin C
317. Enzymes are (SSC CHSL 2013)
318. Heating of an ore below its melting point in the absence of air is known as (SSC CHSL 2013)
319. The most electronegative element among the following is (SSC CHSL 2013)
320. Mark the compound which possesses ionic, covalent and co-ordinate bonds. (SSC CHSL 2013)
321. The depletion of Ozone layer is mainly due to (SSC CHSL 2013)
(a) Chlorofluorocarbon s
(b) Volcanic eruptions
(c) Aviation fuels
(d) Radioactive rays
322. Match correctly the infectious agents given in List I with the diseases caused by them given in List II: (SSCCHSL 2013)
323. Matter waves are (SSCCHSL 2013)
(a) Longitudinal waves
(b) de Brogue waves
(c) Electromagnetic waves
(d) Transverse waves
324. When the milk is churned vigorously the cream from it is separated out due to (SSC CHSL 2013)
(a) Centrifugal force
(b) Centripetal force
(c) Gravitational force
(d) Frictional force
325. Gas thermometers are more sensitive than the liquid thermometers because the gases (SSC CHSL 2013)
(a) have high specific heat
(b) have large coefficient of expansion
(c) are lighter
(d) have low specific heat
326. Which of the following is not caused by atmospheric refraction of light? (SSC CHSL 2013)
(a) Sun becoming visible two or three minutes before actual sunrise
(b) Sun appearing red at sunset
(c) Twinkling of stars at night
(d) Sun appearing higher in the sky than it actually is
327. From which part of Opium Plant we get morphine ? (SSC CHSL 2014)
(d) Fruit coat
328. Which of the following is a Biological method of soil conservation ? (SSC CHSL 2014)
(a) Contour farming
(b) Contour terracing
(c) Gully control
(d) Basin listing
329. Glucose is a type of (SSC CHSL 2014)
(a) Pentose sugar
(b) Hexose sugar
(c) Tetrose sugar
(d) Diose sugar
330. Number of mitochondria in bacterial cell is (SSC CHSL 2014)
331. Rainbow is formed due to (SSC CHSL 2014)
(a) refraction and dispersion
(b) scattering and refraction
(c) diffraction and refraction
(d) refraction and reflection
332. Golden view of sea shell is due to (SSC CHSL 2014)
333. An object covers distance which is directly proportional to the square of the time. Its acceleration is (SSC CHSL 2014)
334. Ifthe horizontal range of a projectile is four times its maximum height, the angle of projection is (SSC CHSL 2014)
335. Which of the following metals has least melting point ? (SSC CHSL 2014)
336. The gas produced in marshy places due to decomposition of vegetation is (SSC CHSL 2014)
(a) Carbon monoxide
(b) Carbon dioxide
(c) Sulphur dioxide
337 In cactue, the spines are the modified (SSC CHSL 2014)
338. The smallest known prokaryotic organism is (SSC CHSL 2014)
339. According to your text, what can “be thought of as the genetic library that keep life going on Earth” ? (SSC CHSL 2014)
(a) A bio-engineering lab
(b) Human genes
(c) The human genome project
340. The boiling point of water decreases at higher altiudes is due to (SSC CHSL 2014)
(b) low atmospheric pressure
(c) high temperature
(d) high atmospheric pressure
341. The chemical name of “Hypo”commonly used in photography is (SSC CHSL 2014)
(a) Sodium thiosulphate
(b) Silver nitrate
(c) Sodium nitrate
(d) Silver iodide
342. Soldering of two metals is possible because of the property of: (SSC CHSL 2015)
(c) Surface tension
343. Stalactites & Stalagmites form due to the precipitation of: (SSC CHSL 2015)
344. Which of the following is a form of sexual reproduction : (SSC CHSL 2015)
345. In which region of electromagnetic spectrum does the Lyman series of hydrogen atom lie ? (SSC CHSL 2015)
346. An electrochemcial cell which is used as a source of direct electrical current at constant voltage under standard conditions is called a: (SSC CHSL 2015)
(a) Power transistor
(d) Uninterrupted power supply (UPS)
347. A light wave is incident over a plane surface with velocity X. After reflection the velocity becomes : (SSC CHSL 2015)
348. The area reserved for the welfare of wild life is called (SSC CHSL 2015)
(b) Botanical garden
(d) National pak
349. The gas dissolved in water that makes it basic is ? (SSC CHSL 2015)
(c) sulphur dioxide
(d) carbon dioxide
350. Yellow complexion, medium stature, oblique eye with an epicanthic fold is the characteristic feature of: (SSC CHSL 2015)
351. Chromosome designation of Turner syndrome is: (SSC CHSL 2015)
352. Distant objects are visible as a little out of focus in this condition : (SSC CHSL 2015)
353. Maximum oxygen is available from: (SSC CHSL 2015)
(a) Green forests
(c) Grass lands
354. In a reaction of the type A + B C + D one could ensure it to be a first order reaction by: (SSC CHSL 2015)
(a) Increasing the concentration of a reactant
(b) Adding a catalyst
(c) Increasing the temperature
(d) Increasing the concentration of a product
355. The amount of matter in a ball of steel is its: (SSC CHSL 2015)
356. Transpiration increases in : (SSC CHSL 2015)
(a) Hot, damp and windy condition
(b) Cool, damp and windy condition
(c) Cool, dry and still condition
(d) Hot, dry and windy condition
357. If xylem and phloem are arranged in the same radius, such a vascular bundle is called: (SSC CHSL 2015)
358. Plank’s constant has the dimensions of: (SSC CHSL 2015)
(a) linear momentum
(b) angular momentum
359. The most abundant element by number in the living system is: (SSC CHSL 2015)
360. Which of the following phenomenon helps to conclude that light is a transverse wave ? (SSC CHSL 2015)
361. Among the following districts ofTamil Nadu, which district is unfit for cultivation due to increased salinity: (SSC CHSL 2015)
362. Natural system of classification was proposed by botanists. (SSC CHSL 2015)
363. Minamata disease is caused by pollution of water by : (SSC CHSL 2015)
(b) methyl isocyanate
364. The “King of Metals” is : (SSC CHSL 2015)
365. Amino acids are required for the synthesis of: (SSC CHSL 2015)
366. The most suitable unit for expressing nuclear radius is: (SSC CHSL 2015)
367. Blowing Air with open pipe is an example of: (SSCCHSL 2015)
(a) Isochoric Process
(b) Isobaric process
(c) Adiabatic process
(d) Isothermal process
368. Christmas factor is involved in : (SSC CHSL 2015)
(d) Blood Coagulation
369. Which one out of the following helps in burning (SSC Multitasking 2013)
(a) Carbon dioxide
(c) Carbon monoxide
370. In organic compounds, nitrogen is estimated by (SSC Multitasking 2013)
(a) Dumas’ method
(b) Carius method
(c) Victor-Meyer’s method
(d) Liebig’s method
371. Master copy of genetic information is (SSC Multitasking 2013)
372. Contraceptive pills in the market contain (SSC Multitasking 2013)
(b) inorganic compounds
373. Nematocysts are present in (SSC Multitasking 2013)
(a) Sea anemone
374. Which of the following micro-organisms is used in milk curdling? (SSC Multitasking 2013)
375. Which of the following is present in Chlorophyll molecule? (SSC Multitasking 2013)
376. When a body fells from an aeroplane, there is increase in its (SSC Multitasking 2013)
(a) potential energy
(b) kinetic energy
377. What does ‘Ozone Layer’ absorb? (SSC Multitasking 2013)
(c) Ultraviolet rays
378. In a water lifting electric pump, we convert (SSC Multitasking 2013)
(a) electrical energy into kinetic energy
(b) electrical energy into potential energy
(c) kinetic energy into electrical energy
(d) kinetic energy into potential energy
379. The type of mirror used in automobiles to see the traffic on the rear side is (SSC Multitasking 2013)
380. The hottest part of the gas flame is known as (SSC Multitasking 2013)
(a) dark zone
(b) blue zone
(c) non-luminous zone
(d) luminous zone
381. Which of the following radiations has the least wavelength? (SSC Multitasking 2013)
382. The earth is a (SSC Multitasking 2013)
(a) bad absorber and bad radiator of heat
(b) good reflector of heat
(c) non-absorber of heat
(d) good absorber and good radiator of heat
383. BCG vaccination is given at the age of (SSC Multitasking 2013)
(a) Within 15days
(b) 2-3 years
(c) 10 years
384. Which of the following atmospheric gases constitute greenhouse gases? (SSC Multitasking 2013)
1. Carbon dioxide
3. Nitrous oxide
4. Water vapour
Select the correct answer using the codes given below.
(c) 1 and 4
(d) 1 and 3
385. Hydrogen bomb is based on the principle of (SSC Multitasking 2014)
(a) Double decomposition
(b) Artificial radioactivity
(c) Nuclear fission
(d) Nuclear fusion
386. The commonly used safety fuse-wire is made of (SSC Multitasking 2014)
(a) an alloy of Nickel and Lead
(b) an alloy of Tin and Lead
(c) an alloy of Tin and Nickel
(d) an alloy of Lead and Iron
387. At what temperature is the density of water the maximum? (SSC Multitasking 2014)
388. The linear expansion of a solid rod is independent of its (SSC Multitasking 2014)
(a) increase in temperature
(b) time of heat flow
(c) initial length
389. Cathode rays when obstructed by metal cause emission of (SSC Multitasking 2014)
(a) y- rays
390. Who is the father of biology? (SSC Multitasking 2014)
(b) Robert Hooke
391. The smallest unit of classification is (SSC Multitasking 2014)
392. Arenchyma is present in (SSC Multitasking 2014)
(a) Banana stem
(b) Palm stem
(c) Aquatic plants
(d) Xerophytic plants
393. The deficiency of vitamin A causes (SSC Multitasking 2014)
(b) Night blindness
394. Clove is a (SSC Multitasking 2014)
(a) Dried flower bud
395. On heating, Gypsum loses certain percentage of its water content and becomes (SSC Multitasking 2014)
(b) Calcium sulphate
(c) Plaster of Paris
(d) a pearl
396. The name of the scientist who discovered neutron is (SSC Multitasking 2014)
397. The bubbles in Champagne and Soda are (SSC Multitasking 2014)
398. Gobar gas contains mainly (SSC MultitaskIng 2014)
(b) Carbon monoxide
(d) Carbon dioxide
399. “Carbon Credit” is a term associated with the (SSC Multitasking 2014)
(a) Global deforestation
(b) Offshore banking
(e) Protection of environment
(d) Deforestation in India
400. The green colour of plant leaves is due to (SSC Multitasking 2014)
401. Temperature is measured by the instrument called (SSC MultitaskIng 2014)
402. The pH of pure water is (SSC Multitasking 2014)
403. The process of separation of pure water from impurities is called (SSC Multitasking 2014)
(a) Fractional crystallisation
404. H2S04 cannot be used as (SSC Multitasking 2014)
(b) Food preservative
(c) Drying agent
(d) Dehydrating agent
405. The red colour of ripe tomatoes is due to the presence of (SSC Sub. Ins. 2012)
406. Anticoagulants are not present in (SSC Sub. Ins. 2012)
(b) Bed bug
407. Vegetation is effective in absorbing (SSC Sub. Ins. 2012)
(a) Pollutant gases
(b) Polluted water
(c) High frequency sound
(d) Pollutant metals
408. When a person cries, there is a watery discharge from the nose due to activation of (SSC Sub. Ins. 2012)
(a) Salivary gland
(b) Lachrymal gland
(c) Thyroid gland
(d) Endocrine gland
409. The fundamental role of root hairs in plants is (SSC Sub. Ins. 2012)
(a) to protect the young root from damage by coarse soi Id particles
(b) to protect the root from soil microbes
(c) to absorb water and mineral salts from the soil
(d) to bind soil particles to the root for firm fixation of the plant
410. Catch crops are (SSC Sub. Ins. 2012)
(a) crops painted to attract certain insect pests to be destroyed
(b) crops planted to attract certain useful insects to be used for biological control of pests
(c) crops to be cut and fed green to the cattle
(d) substitute crops planted after the regular crop has failed.
411. The pigment that protects plants form UV damage is (SSC Sub. Ins. 2012)
412. A bioenergy source obtained by fermentation to supplement fossil fuel petrol is (SSC Sub. Ins. 2012)
413. The substance that causes the worst air pollution is (SSC Sub. Ins. 2012)
(b) Sulphur dioxide
(c) Carbon dioxide
(d) Carbon monoxide
414. A liquid is said to boil when its (SSC Sub. Ins. 2012)
(a) vapour pressure equals the surrounding pressure
(b) vapour pressure vanishes to zero
(c) vapour pressure is greater than the surrounding pressure
(d) vapour pressure is less than the surrounding pressure
415. Which is not correct regarding covalent compounds? (SSC Sub. Ins. 2012)
(a) The reaction is slow
(b) The reaction is fast
(c) Compounds are usually liquids and gases
(d) Boiling points and melting points are low
416. Choose the correct statement (SSC Sub. Ins. 2012)
(a) The components of a mixture cannot be separated
(b) The properties of a mixture are the same as those of its components*
(c) Mixtures are homogeneous
(d) In a mixture the components are present in a fixed ratio
417. PVC is obtained by the polymerisation of (SSC Sub. Ins. 2012)
(b) Vinyl chloride
418. To eliminate the glare of headlights in motor cars, (SSC Sub. Ins. 2012)
(a) polaroids are used
(b) glass prisms are used
(c) thin films are used
(d) filters are used
419. The substances which have infinite electrical resistance are called (SSC Sub. Ins. 2012)
420. Stainless steel is an alloy of (SSC Sub. Ins. 2012)
(a) iron, chromium and nickel
(b) iron, chromium and carbon
(c) iron, carbon and zinc
(d) iron, zinc and manganese
421. Enriched uranium used in a nuclear reactor is (SSC Sub. Ins. 2012)
(a) uranium free of all impurities
(b) uranium treated with radiation
(c) uranium alloyed with aluminium
(d) uranium with a high percentage of a particular isotope
422. In a refrigerator, cooling is produced by (SSC Sub, ins. 2012)
(a) the ice which deposits in the freezer
(b) the sudden expansion of a compressed gas
(c) the evaporation of a volatile liquid
(d) None of these
423. Which one of the following statements about Pyrolysis which is a process for solid waste treatment is incorrect? (SSC Sub. Ins. 2013)
(a) ¡t converts the waste into solid, liquid and gas of which the resultant liquid and gas can be used to produce energy.
(b) The process occurs at a temperature above 430°C at atmospheric pressure.
(c) The process occurs under high pressure at temperature above 430°C.
(d) It is a thermochemical decomposition of organic waste
424. Which of the tòllowing supports particle nature of ph otons? (SSC Sub. Ins. 2013)
(c) Photoelectric effect
425. The heaviest naturally occurring element is: (SSC Sub. Ins. 2013)
426. Haptens are: (SSC Sub. ins. 2013)
(b) Incomplete antigens
427. Sulphur dioxide bleaches colouring matter by: (SSC Sub. Ins. 2013)
428. Which of the following elements is not radio-active? (SSC Sub. Ins. 2013)
429. Wilting of plants occurs due to excessive: (SSC Sub. Ins. 2013)
430. Gypsum is used for improvement of: (SSC Sub. Ins. 2013)
(a) Alkaline soils
(b) Saline soils
(d) Acidic soils
431. Indicate the correct arrangement for electromagnetic radiation in order of their increasing wavelength. (SSC Sub. Ins. 2013)
(a) Microwave, infrared, visible, X-rays
(b) X -rays, visible, inared, microwave
(c) Visible, infrared, microwave, X-rays
(d) X – rays, infrared, visible, microwave
432. The rapidly growing mass of phytop!ankton covering the surface water of a lake or pond is known as (SSC Sub. Ins. 2013)
(b) Water bloom
(c) Water pollution
(d) Water hyacinth
433. Wings of birds are: (SSC Sub. Ins. 2013)
(a) Modified hind limbs
(b) New structure
(c) Integumentary outgrowth
(d) Modified fore limbs
434. Spontaneous change is one in which there is (SSC Sub. Ins. 2013)
(a) A lowering of entropy
(b) A lowering of free energy
(c) Increase in free energy
(d) An increase in Internal energy
435. Sandstone is metamorphosed to (SSC Sub. Ins. 2013)
436. Instrument used to study the behaviour of a vibrating string is (SSC Sub. Ins. 2013)
437. The casual organism of Polio is (SSC Sub. Ins. 2013)
(a) A fungi
(b) A virus
(c) A worm
(d) A bacteria
438. Panda belongs to the same family as that (SSC Sub. Ins. 2013)
439. The pancreas secretes (SSC Sub. Ins. 2014)
(c) Peptic juice
(d) None of these
440. When we touch leaves of “Touch me not plant”, they close, these movements are called (SSC Sub. Ins. 2014)
(a) photonastic movements
(b) nyctinastic movements
(c) seismonastic movements
(d) chemonastic movements
441. The concept of tissue culture was introduced by (SSC Sub. Ins. 2014)
442. Beak is formed by (SSC Sub. Ins. 2014)
443. Pinna (external ear) is present in (SSC Sub. Ins. 2014)
444. Purity of a metal can be determined with the help of (SSC Sub. Ins. 2014)
(a) Pascal’s law
(b) Boyle’s law
(c) Archimedes principle
(d) ‘ Conservation of mass principle
445. If both the mass and the velocity of a body is increased to twice of their magnitude, the kinetic energy will increase by (SSC Sub. Ins. 2014)
(a) 2 times
(b) 4 times
(c) 8 times
(d) 16 times
446. Two bodies kept at a certain distante feel a gravitational force F to each other. If the distance between them is made double the former distance, the force will be (SSC Sub. Ins. 2014)
447. Stationary wave is formed by (SSC Sub. Ins. 2014)
(a) a transverse wave superposing a longitudinal wave
(b) two waves of the same speed superposing
(c) two waves of same frequency travelling in the same direction
(d) two waves of same frequency travelling in the opposite direction
448. In an oxygen molecule, two atoms are united by (SSC Sub. Ins. 2014)
(a) the bond
(b) two bonds
(c) three bonds
(d) four bonds
449. The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing is (SSC Sub. Ins. 2014)
450. How many neutrons are there in 92U238 atom ? (SSC Sub. Ins. 2014)
451. Root pressure is measured by (SSC Sub. Ins. 2014)
452. Cell becomes turgid because of (SSC Sub. Ins. 2014)
453. The process of imbibition involves (SSC Sub. Ins. 2014)
(b) capillary action
(d) both (A) & (B)
454. A cell increases in volume when it is placed in (SSC Sub. Ins. 2014)
(a) Hypertonic solution
(b) Hypotonic solution
(c) Isotonic solution
(d) None of these
455. A reversible and an irreversible engine are working between the same limits of temperature. The efficiency of. (SSC Sub. Ins. 2015)
(a) The reversible engine is greater than the irreversible engine.
(b) Each engine is 100%.
(c) The two engines are equal
(d) The irreversible engine is greater than the reversible engine.
456. Which of the following is used in the treatment of cancer? (SSC Sub. Ins. 2015)
457. The most abundant element is (SSC Sub. Ins. 2015)
458. An electron microscope gives higher magnifications than an optical microscope because (SSC Sub. Ins. 2015)
(a) the electrons have more energy than the light particles.
(b) the electron microscope uses more powerful lenses.
(c) the wavelength of electrons is smaller as compared to the wavelength of visible light.
(d) the velocity of electrons is smaller than that of light.
459. What does the word ‘ amphibian ’ mean ? (SSC Sub. Ins. 2015)
(a) Two lives
(b) Four lives
(c) Three lives
(d) One life
460. Nitrogen in water is commonly found in the form of (SSC Sub. Ins. 2015)
(a) Nitric oxide
(b) Nitrous oxide 1
461. Immunization technique was developed by (SSC Sub. Ins. 2015)
(a) Louis Pasteur
(b) Robert Koch
(c) Joseph Lister
(d) Edward jenner
462. The hydrophilic nature of DNA is due to the presence of (SSC Sub. Ins. 2015)
(a) a number of hydrogen bonds
(b) phosphate group
(c) deoxyribose sugar
(d) thymine base
463. The sense of balance is achieved by (SSC Sub. Ins. 2015)
(a) Cerebellum equilibrium
(b) Thalamus equilibrium
(c) Cerebrum equilibrium
(d) Spinal cord equilibrium
464. Aluminium salt commonly used to stop bleeding is (SSC Sub. Ins. 2015)
(a) Aluminium chloride
(b) Aluminium nitrate
(c) Aluminium sulphate
(d) Potash alum
465. Total internal reflection cannot take place when light goes from: (SSC Sub. Ins. 2015)
(a) water to glass
(b) water to air
(c) glass to air
(d) glass to water
466. Interferons are synthesized in response to (SSC Sub. Ins. 2015)
467. The first law of thermodynamics is simply the case of (SSC Sub. Ins. 2015)
(a) Charle’s law.
(b) the law of conservation of energy
(c) the law of heat exchange.
(d) Newton’s law of cooling.
468. Red rot of sugarcane is caused by (SSC Sub. Ins. 2015)
(b) Cercospora personata
(c) Altemaria altemata
(d) Phylophthora Infestans
469. A clone is a group of individuals obtained through : (SSC Sub. Ins. 2015)
(a) self pollination
(d) cross pollination
470. Chemical name of Gammexane is: (SSC Sub. Ins. 2015)
471. The fleshy thalamus is edible in: (SSC Sub. Ins. 2015)
(b) Orange .
472. A new molecule Heat Shock Protein 90 (HSP90) was discovered in 2014 by the Didier Picard. The new discovery could help in effective treatment of (SSC Sub. Ins. 2016)
(b) AIDS .
(d) None of these
473. Antigen presenting cells are specialized cells present in all of the following, except (SSC Sub. Ins. 2016)
(b) Lymph node
474. Which of the following determines whether a group of organisms that is from the same genus and species arise from a common source or from different sources? (SSC Sub. Ins. 2016)
(b) DNA hybridization / DNA
(d) Phage typing
475. Starch is insoluble in water but still it is stored in large quantity in potato because (SSC Sub. Ins. 2016)
(a) soil microorganisms deposit it in the tuber.
(b) it is synthesized in potato root.
(c) it is useful for human.
(d) it is translocated in the form of sugar from leaves.
476. Viruses that infect bacteria are called (SSC Sub. Ins. 2016)
(a) Basal body
477. A dispersion indicates (SSC Sub. Ins. 2016)
(a) the value of standard deviation.
(b) spread of data around central measure.
(c) the value of mean
(d) the value of mode
478. The principle involved in the absorption of water by soil is (SSC Sub. Ins. 2016)
(a) Suction action
(c) Capillary action
(d) Principal of absorption
479. Which of the following is present in maximum amount in acid rain? (SSC Sub. Ins. 2016)
(c) H2 CO3
480. The lethal dose required to kill 50% of the lab animals tested under standard is referred as (SSC Sub. Ins. 2016)
481. Wheat is a _______ (SSC CGL 2017)
482. Snakes, turtle, lizards and crocodiles falls under which category of animals? (SSC CGL 2017)
483. Which of the following instrument is used to measure Soil Water Tension? (SSC CGL 2017)
484. What is the SI unit of Force? (SSC CGL 2017)
485. Which one of the following is a bad Thermal Conductor? (SSC CGL 2017)
486. Rusting is . (SSC CGL 2017)
(c) Redox reaction (Oxidation and Reduction)
487. Which amongst the following is not a Cation? (SSC CGL 2017)
(a) Aluminium ion
(b) Copper iron
(c) Sulphate ion
(d) Zinc ion
488. Which of the following is not a component of Smog? (SSC CGL 2017)
(a) Volatile organic compounds
(b) Nitrogen Oxide
(c) Sulphur dioxide
(d) Chlorine oxide
489. Auxiliary bud develops into which of the following part of the plant? (SSC CGL 2017)
490. Xylem helps in transportation of which of the following? (SSC CGL 2017)
(d) Both food and water
491. Who proposed five kingdom classification? (SSC CGL 2017)
(a) Ernst Mayr
(b) RH. Whittaker
(c) M.W. Beijerinck
(d) D.I. Ivanovsky
492. What is the other name of Galileo’s law of falling bodies ? (SSC CGL 2017)
(a) Law of motion
(b) Newton’s first law
(c) Newton’s second law
(d) Newton’s third law
493. Which of the following device is best suited for measuring the temperature inside metallurgical furnaces? (SSC CGL 2017)
494. Which acid is released when an Ant bites? (SSC CGL 2017)
(a) Hydrochloric Acid
(b) Formic Acid
(c) Acetic Acid
(d) Phosphoric Acid
495. Which among the following is an example of solid sol? (SSC CGL 2017)
(a) Milk of magnesia
(c) Acetic Acid
(d) Phosphoric Acid
496. Which metal is rcponsible for Itai – Itai disease? (SSC CGL 2017)
497. Cattle quickly swallow grass and store it in their . (SSC CGL 2017)
(c) small intestine
(d) salivary glands
498. Which of the following carries oxygen to various parts of human body? (SSC CGL 2017)
(a) Red blood cells
(b) White blood cells
499. Which of the following function is performed by the kidneys in the human body? (SSCCGL 2017)
500. The bending of light when it passes around a corner or a slit is due to . (SSC CGL 2017)
(d) total internal reflection
501. What is the reason for formation of Mirage in desert? (SSCCGL2017)
(a) Refraction of light
(b) Reflection of light
(c) Total internal reflection of light
(d) Both Refraction and Total internal reflection of light
502. Which of the following bonds are weakest in nature? (SSCCGL2017)
(a) Single bond
(b) Double bond
(c) Triple bond
(d) Hydrogen bond
503. In the following reaction, fill in the blank. Acid + Base ® + Water. (SSCCGL2017)
(a) Carbon dioxide
(b) Metal Oxide
(c) Hydrogen Gas
504. Bishnoi movement was started against which of the following? (SSC CGL 2017)
(a) Cutting of Trees
(b) Inequality of Women
(c) Killing of Animals
(d) Increasing Pollution
505. Cinnamon is obtained from which part of the plant? (SSC CGL 2017)
506. Insulin is a kind of (SSC CGL 2017)
507. Which among the following carries impure blood to human heart? (SSC CGL 2017)
(b) Pulmonary vein
(c) Pulmonary arteries
(d) Vena Cava
508. Why does water tank appear shallower when viewed from the top? (SSC CGL 2017)
(a) Due to reflection
(b) Due to refraction
(c) Due to diffraction
(d) Due to total internal reflection
509. Which colour is formed when Red and Green are mixed? (SSC CGL 2017)
(a) Light blue
510. What is an endothermic reaction? (SSC CGL 2017)
(a) Reaction in which heat is released
(b) Reaction in which heat is absorbed
(c) Reaction in which neither heat is released nor absorbed
(d) None of these
511. Which ofthe following is an ore of Aluminium? (SSC CGL 2017)
(d) Epsom Salt
512. Which of the following gas was released during Bhopal gas tragedy? (SSC CGL 2017)
(a) Methyl isocyanate
(b) Sodium isothiocyanate
(c) Nitrogen isothiocynate
(d) Potassium isothiocynate
513. Which drug is used as an Anti-Anxiety drug? (SSC CHSL 2017)
514. Ficus benghalensis is the scientific name of (SSC CHSL 2017)
515. Equus burchellii is the scientific name of . (SSC CHSL 2017)
516. Atomic number of which ofthe following elements is greater than that of Copper? (SSC CHSL 2017)
517. Which of the following is false with reference to a photo-voltaic cell? (SSC CHSL 2017)
(a) It is another name as solar cell
(b) It can be used as infra-red detectors
(c) It can store light energy in the form of electrical energy
(d) It converts electric energy into light energy
518. Methane an air pollutant is produced (SSC CHSL 2017)
(a) by action of ultraviolet light on nitrogenous compounds.
(b) as a by-product of manufacturing ammoniacal fertilizers
(c) by burning of coal in insufficient air
(d) by digestion of food by animals
519. Rate of work done is (SSC CHSL 2017)
520. What is the unit of the physical quantity, “Young’s modulus”? (SSC CHSL 2017)
521. Where is bile stored? (SSC Sub. Ins. 2017)
(c) Gall bladder
522. Which of the following is not a connective tissue? (SSC Sub. Ins. 2017)
(a) Adipose Tissue
(b) Compact Bone
(c) Cardiac Musle
(d) Areolar Tissue
523. Normallyhow many times the human heart beats in a minute? (SSC Sub. Ins. 2017)
524. Muscle fatigue occurs due to accumulation of . (SSC Sub. Ins. 2017)
(c) Lactic Acid
(d) Carbonic Acid
525. The inexhaustible source of energy of stars is due to . (SSC Sub. Ins. 2017)
(a) Conversion of hydrogen to helium
(b) Conversion of helium to hydrogen .
(c) Decay of radioactive elements.
(d) Excess of oxygne
526. Which of the following waves has the highest frequency? (SSC Sub. Ins. 2017)
527. Why the clear nights are cooler than the cloudy nights? (SSC Sub. Ins. 2017)
528. The subatomic particle that does not have any electric charge is aJan . (SSC Sub. Ins. 2017)
(d) All options are correct.
529. Which of the following gas is used in bulb? (SSC Sub. Ins. 2017)
530. Chlorine gas is a major component ofwhich of the following? (SSC Sub. Ins. 2017)
(b) Tear gas
(c) Liquified petroleum Gas
(d) Gobar gas
531. What is Brine solution? (SSC Sub. Ins. 2017)
(a) Excess salt + water
(c) Excess Ethanol + water
(d) Excess Starch + water
532. Which of the following primarily causes lead pollution? (SSC Sub. Ins. 2017)
(a) CFL Lamp
(b) Automobile Battery
(d) Diesel Engine
533. What was the main aim of Montreal protocol? (SSC Sub. Ins. 2017)
(a) Protection of Ozone layer
(b) Bio- diversity Conservation
(c) Global Warming
(d) Climate Change
534. Supersonic jets cause thinning of which layer? (SSC Sub. Ins. 2017)
(a) 02 layer
(b) 03 Layer
(c) C02 layer
(d) SO2L layer
535. Biogas is formed through: (SSC MTS 2017)
(c) Aerobic respiration
536. Slow and uniform cooling of hot iron in its metallurgy is known as: (SSCMTS 2017)
(a) chilling ,
537. In the context of alternative sources of cnergy ethanol as a viable bio – fuel can be obtained from: (SSC MTS 2017)
538. Distant objects can be seen with the help of? (SSC MTS 2017)
539. Two gaseous molecules can react only when they have same (SSCMTS2O17)
(c) Free energy
(d) orientationlsteric factor
540. Brown ring test is used for the detection of (SSC MTS 2017)
541. The element involved with blood clotting is: (SSCMTS 2017)
542. Which type of function does the analytical engine perform? (SSC MTS 2017)
(a) Logical functions
(b) Arithimetic functions
(c) Control functions
(d) Relational functions
543. The largest part of our brain is: (SSC MTS 2017)
(b) Medulla oblongata
544. Insulin activates in (SSC Steno. 2017)
545. Which amòng the following is not related to vitamin B complex group? (SSC Steno. 2017)
(c) Ascorbic acid
(d) Fol ic acid
546. Viruses are usually rade of which of the following? (SSCSteno. 2017)
(a) Protein + Carbohydrates
(b) Protein + Nucleic acid
(c) Protein + Ascorbic Acid
(d) Protein + Lipid
547. “Shrubs” are woody plants generally smaller and more compact than trees. Which of the fbllowing is not a shrub tree? (SSC Steno. 2017)
(c) Butterfly Bush
548. A medical procedure, during which a small sample of tissue is removed from a part of the body, is . (SSC Steno. 2017)
(b) CT Scan
(d) All options are correct.
549. Which among the following is cryogenic engines are used? (SSC Steno. 2017)
(a) In rocket technology
(b) To run the navy ships
(c) In frost free refrrigerators (d)
All options are correct.
550. During photosynthis light energy is converted into which of the following? (SSC Steno. 2017)
(a) Mechanical energy
(b) Chemical energy
(e) Heat energy
(d) Radiation energy
551. What is the reason of surface tension in a liquid? (SSC Steno. 2017)
(a) Electrical force between molecules
(b) Cohesive force between molecules
(e) Adhesive force between molecules
(d) Gravitational force between molecules
552. In which process there is gain of electron? (SSC Steno. 2017)
552. In which process there is gain of electron? (SSC Steno. 2017)
(c) Oxidation ‘
553. Solder is an alloy made of which two metals? (SSC Steno. 2017)
(a) Zinc and lead
(b) Zinc and copper
(c) Tin and zinc
(d) Tin and lead
554. An increase in which of the following gases leads to global warming? (SSC Steno. 2017)
(b) Carbon dioxide
(c) Sulphur dioxide
Hints & Solutions
Vitamin B-12, also called cobalamin, is a water-soluble vitamin that has a key role in the normal functioning of the brain and nervous system, and the formation of red blood cells.
Chloropicrin is a chemical compound currently used as a broad-spectrum antimicrobial, fungicide, herbicide, insecticide, andnematicide. Chloropicrin is harmful to humans. It can be absorbed systemically through inhalation, ingestion, and the skin. At high concentrations it is severely irritating to the lungs, eyes, and skin.
Air at atmospheric pressure is a nearly ideal gas, and sound transmission in air is close to adiabatic for normal frequencies and transmission distances. The total internal energy of the gas through which sound travels remains same.
The plasma membrane is composed of a phospholipid bilayer. Phospholipids are lipids with a phosphate group attached to them. The phospholipids have one head and two tails. The head is polar and hydrophilic, or water-loving. The tails are nonpolar and hydrophobic.
Mitochondria are called the powerhouse a cell because they produce energy for the functioning of a cell. Energy is produced by the oxidation of food by the process of respiration.
Boiling point of heavy water is higher than that of ordinary water.
Arboreal animals are creature who spend the majority of their lives in trees. They eat, sleep and play in the tree canopy. There are thousands of species that live in trees, including monkeys, koalas, possums, sloths, various rodents, parrots, chameleons, geckos, tree snakes and a variety of insects.
Advection is the transfer of heat or matter by the flow of a fluid, especially horizontally in the atmosphere or the sea.
Bats are good at flying at night because they use sound rather than sight to navigate. Bats send pulses of sound through their mouths or noses, and these pulses echo back outlining the objects in the bats flight path. The ears of a bat are large and oddly constructed but they help it to determine where the echoes are coming from.
No change will happen.
Cartography, the art and science of graphically representing a geographical area, usually on a flat surface such as a map or chart. It may involve the superimposition of political, cultural, or other non geographical divisions for the representation of a geographical area.
An antiknock agent is a gasoline additive used to reduce engine knocking and increase the fuel’s octane rating by raising the temperature and pressure at which
auto ignition occurs. The typical antiknock agents in use is Tetraelhyllead.
The equatorial bulge and the effects of the surface centrifugal force due to rotation results in lower acceleration due to gravity at Equator than that at the poles.
A nucleon of a atom consists of either a proton or a neutron. Positrons are not present in a normal atom and are only produced during radioactive decay.
Bullets tired from gun contain lead which when not removed from the body of an injured body may cause toxic effect.
Salivary gland contains an enze called ptyalin which breaks down starch into simpler sugars such as maltose and dextrin that can be further broken down in the
Thelimeperiodofapendulum is inverselyproportional to gravity Thè gravity of the Moon is six times less than that of the Earth, hence the time period of a pendulum onth Moon is more than that on the Earth.
The most common use for asbestos is as a cement additive. By adding asbestos to a mixture of cement, the tensile strength of a sheet of cement would be
increased 10 fold. Workers working in the cement industry are exposed to asbestos, getting infected with white lung disease.
Lead in automobile exhaust is carcinogenic to humans causing lung cancer.
Keibul Lamjao National Park in the Bishnupur district of Manipur is the only floating park in the world.
Amia is called Herbal Indian Doctor becäuse it is used to cure many ailments naturally.
Mirage formation is a result of the refraction and the total internal reflection of light in the’ air. Mirages happen when the ground is very hot and the air is cool. The hot ground warms a layer of air just above the ground. A layer of very warm air near the ground refracts the light from the sky nearly into a U-shaped bend. Our brain thinks the light has travelled in a straight line.
Vulcanization is a chemical process for converting natural rubber or related polymers into more durable materials by the addition of sulfur.
This process usually occurs in the upper third part of the fallopian tube of the woman.
Cirrhosis is a condition in which the liver does not function properly due to long-term damage. Cirrhosis is most commonly caused by alcohol, hepatitis B, hepatitis C, and non-alcoholic fatty liver disease. Typically, more than two or three drinks per day over a number of years is required for alcoholic cirrhosis to occur.
The food webs we see are grazing food chains since at their base are producers which the herbivores graze on.
Weight of 1 mole of water (H20) = 18 gm Therefore, weight of 10 moles of water=180 gm
Carrot is rich in Vitamin A and it improves eyesight.
The reason for this is the hydrogen bonding between neighboring water molecules. Because hydrogen bonding is a relatively strong intermolecular force, high heat energy is required to break up the force.
Valence electrons are important in determining how an elements reacts chemically with other elements. Since the valence electrons are the electrons in the highest energy level, they are the most exposed of all the electrons, so they are the electrons that get most involved in chemical reactions.
The lumen is the SI derived unit of luminous flux, a measure of the total “amount” of visible light emitted by a source.
A dissipative force counteracts motion. Its direction is opposite to the direction of the velocity vector. Dynamic friction is a dissipative (non-conservative) force, it dissipates energy (mainly through heat and sound), and energy lost by moving in one direction.
As the length increases and the cross sectional area decreases, the electrical resistance of the wire also rises.
Consequent Poles are magnetic poles that exist where the specimen has been successively magnetized in different sections to create more than two poles; e.g., two north poles with one south pole between them.
Fructose, or fruit sugar, a is one of the three dietary monosaccharide, along with glucose and galactose, which is absorbed directly into the bloodstream during digestion.
Methylated spirit contains mostly ethanol. Methylated spirits is a mixture of ethyl alcohol (95%) and methyl alcohol (%5). The methyl alcohol is poisonous and is added to prevent the methylated spirits being used as cheap drinking alcohol.
A sporozoite is the cell form that infects new hosts. In plasmodium, for instance, the sporozoites are cells that develop in the mosquito’s salivary glands, leave the mosquito during a blood meal, and enter liver cells (hepatocytes) where they multiply.
Ex-situ conservation is the process of protecting an endangered species of plant or animal outside of its natural habitat. Zoos and botanical gardens are the most conventional methods of ex-situ conservation. Endangered plants may also be preserved in part through seed banks or germplasm banks.
Diatom ooze (formed from microscopic unicellular algae having cell walls consisting of or resembling silica) is the most widespread deposit in the high southern latitudes.
Photosynthetic Chromatophores vesicles found in some purple bacteria constitute one of the simplest light-harvesting systems in nature.
Convex mirrors reflect light outwards; therefore they are not used to focus light. So, the convex mirror has a wide field of view and hence is used as rear view mirror as it gives a clear diminished and an erect image of the vehicle that is behind.
The principal components of pyroligneous acid are acetic acid, acetone and methanol. It was once used as a commercial source for acetic acid.
UCIL produced batteries, carbon products, welding equipment, plastics, industrial chemicals, pesticides, and marine products.
Most drying oils owe their drying properties to the presence of a large percentage of linolenic acid (which derives its name from “linseed”), which is highly unsaturated.
Carotenoids are tetraterpenoid organic pigments that are naturally occurring in the chloroplasts and chromoplasts of plants and some other photosynthetic organism like algae, some bacteria, and some types of fungus.
Close to the surface of the Sun, the light it emits is not in parallel beams at all. It sends photons out in pretty much every direction at random. But the Sun is far away from Earth. Most of those photons don’t reach the Earth because they’re heading in the wrong direction. Only those photons that happen to be heading toward the Earth actually get there – and the photons that are heading to the Earth are all heading in more or less the same direction. So the photons that actually reach the Earth are all travelling in more or less parallel directions.
Polar bears, which pile on fat to survive hibernation and yet do not become diabetic, hold clues for treating Type II diabetes, a disease associated with obesity that afflicts more than 190 million people worlwide, reaching epidemic proportions in many countries.
All electromagnetic waves regardless of their wavelengths, including all colors of light, have the identical speed in a vacuum. ’
In hydroelectric power plants the potential energy of water is utilized to produce electricity. The height of water in the reservoir decides how much potential energy water possesses.
In people with emphysema, the lung tissue involved in exchange of gases (oxygen and carbon dioxide) is impaired or destroyed. Emphysema is included in a group of diseases called chronic obstructive pulmonary disease of COPD.
Potassium Nitrate occurs as a mineral niter and is a natural solid source of nitrogen. Potassium nitrate is one of several nitrogen-containing compounds collectively referred to as saltpeter.
Dry ice is the solid form of carbon dioxide. It is used primarily as a cooling agent. Its advantages include lower temperature than that of water ice and not leaving any residue.
With the rise of temperature, the velocity of gas molecules increases, increasing the kinetic energy.
Tetraethyllead is an organolead compound used as a petro-fuel additive that allowed engine compression to be raised substantially. This in turn increased vehicle performance.
Two pollutants emitted by motor vehicles react to form ground-level ozone or smog which can cause respiratory problems and reduce visibility.
Green glands in some crustaceans have an excretory function and open at the bases of the larger antennae.
Cardiac muscle is an involuntary striated muscle tissue found only in the organ heart. Involuntary muscles are smooth muscles that are not directly controllable at will. For example You don’t have to remind yourself to make your heart beat, so it is involuntary. Voluntary muscles are controllable like those found in your arms, legs, hands, etc.
Ringworm is common disease, especially among children. It is caused by a fungus, not a worm like the name suggests. It is a common and highly infectious skin infection that causes a ring-like red rash on the skin.
Marble, chalk and limestone are all carbonates of calcium, whereas slaked lime is calcium hydroxide.
Centrifugal force is an example of a pseudo-force, that is, an apparent force to someone whose frame of reference is not at rest or moving with a constant velocity. In the case of centrifugal force, the frame of reference is rotating.
An antacid is a substance which neutralizes stomach acidity.
Annealing is the process by which both metal and glass are treated with heat in order to change their properties.
This is because the scattering in red light is less than that of yellow colour. The longest visible wavelength is red and the shortest is violet. The wavelength of red light is more than yellow light.
Transboundary pollution is the pollution that originates in one country but is able to cause damage in another country’s environment, by crossing borders through pathways like water or air. Acid rain is a classic example of a transboundary pollution because it can be blown anywhere by the wind. Sulphur dioxide and nitrous oxides are the two main chemicals that react with water to make acid rain. The chemicals are commonly released from power stations, factories and transport.
The Nicobar pigeon is a pigeon found on small islands and in coastal regions from the Nicobar Islands, India, through the Malay Archipelago, to the Solomons and Palau. It is the only living member of the genus Caloenas and the closest living relative of the extinct dodo..
A limnic eruption, also referred to as a lake overturn, is a rare type of natural disaster in which dissolved carbon dioxide (C02) suddenly erupts from deep lake waters, forming a gas cloud that can suffocate wildlife, livestock and humans.
The inventor of blood group is Karl Landsteiner, was bom in Vienna, June 14,1868. He is a scientist in the field of bio-treatment. He was awarded Nobel Prize for Medicine and Fisiologi field in 1930. This is because the classification of all types of blood into four namely; A, B, AB, and O in the year 1909.
DPT refers to a class of combination vaccines against three infectious diseases in humans: diphtheria, pertussis (whooping cough), and tetanus. The vaccine components include diphtheria and tetanus toxoids and kills whole cells of the organism that cause pertussis.
The oxalic acid is an ideal chemical for cleaning purposes. Its bleach-like qualities make it perfect for sterilizing household items. It is also efficient in removing rust on various different surfaces. Stains on counters, bathtubs and kitchen sinks can be removed through careful application of this chemical.
Rectified spirit, also known as neutral spirits, rectified alcohol, or ethyl alcohol of agricultural origin is highly concentrated ethanol which has been purified by means of repeated distillation, a process that is called rectification. It is 95.5% alcohol and 4.5% water. It is treated with CaO to form lime of alcohol, which undergoes fractional distillation to give ethanol.
The Intergovernmental Panel on Climate Change (IPCC) is a scientific and intergovernmental body under the auspices of the United Nations, set up at the request of member governments, dedicated to the task of providing the world with an objective, scientific view of climate change and its political and economic impacts.
Hypothermia is a medical emergency that occurs when your body loses heat faster than it can produce heat, causing a dangerously low body temperature. Normal body temperature is around 98.6 F (37 C). Hypothermia occurs as your body temperature passes below 95 F (35 C).
Semiconductors are insulators at low temperatures and reasonably good conductors at higher temperatures. As temperature increases, the semi-conductor material becomes a better and better conductor.
Mass of proton is 1.672621777 (74) x 10’27 kg. An electron has a mass (9.1093829140) x 10-31 kg) that is approximately 1/1836 that of the proton. The mass of neutron is slightly larger than that of a proton. The mass of the hydrogen nucleus is 1.7 x 10 27 kg. The heaviest of these particles is the neutron.
A television channel is a physical or virtual channel over which a television station or television network is distributed. Channel numbers represent actual frequencies used to broadcast the television signal. For example, in North America. “Channel 2” refers to the broadcast or cable band of 54 to 60 MHz, with carrier frequencies of55.25 MHz for NTSC analog video (VSB) and 59.75 MHz for analog audio (FM), or 55.31 MHz for digital ATSC (8 VSB).
Water never has an absolute density because its density varies with temperature. Water has its maximum density of lg/cm3 at 4 degrees Celsius. When the temperature changes from either greater or less than 4 degrees, the density will become less than 1 g/cm3.
Photosynthesis is the process by which light energy is converted into chemical energy by organisms. Carbon dioxide and water are the raw materials of this process. The light energy comes from the sun and its end products are oxygen and glucose.
An emulsion is a mixture of two or more liquids that are normally immiscible (nonmixable or unblendable). Emulsions are part of a more general class of two- phase systems of matter called colloids. In an emulsion, one liquid (the dispersed phase) is dispersed in the other the continuous.
The active ingredient in Dettol that confers its antiseptic property is chloroxylenol (CgHgCIO), an aromatic chemical compound. Chloroxylenol comprises 4.8% of Dettol’s total mixture, with the rest composed of pine oil, isopropanol, castor oil soap caramel and water.
Researchers in Mangolia and China completed studies to unravel the genomic Peculiarities behind the physiological tricks that camels use to survive in the harshest of conditions. They described the genomes of wild and domesticated Bactrian camels.
Fine particles known as PM10 and PM25can penetrate deep into the lungs, creating health problems. People with heart or lung diseases, older adults, and children are most likely to have problems because of contact with particle pollution. Short-term exposure to PM among pregnant women has been associated with prematurity and growth retardation.
PNG is a mixture consisting mainly methane CH4 with a small percentage of other higher hydrocarbons. The ratio of carbon to hydrogen is least in methane and hence it bums almost completely making it the cleanest fuel. Domestic PNG customers, also known as Residential customers, use gas for cooking purpose and also for heating water through gas geysers.
Green Park Stadium is a 60,000 capacity floodlit multi purpose stadium located in Kanpur, India, and the home of the Uttar Pradesh cricket team.
AccordingtotheRedlistof2012GangesRiverDolphin is one of critically endangered species in India. Endangered species in India comprise large varieties of rare species of wild animals, aquatic animals and insects.
Arson is the crime of intentionally and maliciously setting fire to buildings, wild land areas, vehicles or other property with the intent to cause damage. Distinct from spontaneous combustion and natural wildfires, it is considered to be a man-made disaster which is socially induced.
The thyroid gland is one of the largest endocrine gland in the throat, and consists of two connected lobes. It is found at the front of the neck, below the Adam’s apple. The thyroid gland secretes thyroid hormones, which influence the metabolic rate, protein synthesis, and have a wide range of other effects, including on development.
The cerebrum is the seat of intelligence and provides us with the ability to read, write and speak, make calculations and compose music; remember the past and plan for the future; and create works.
The average adult has a blood volume of roughly 5 liters, which is composed of plasma and several kinds of cells. By volume, the red blood cells constitute about 45% of whole blood, the plasma about 54.3%, and white cells about 0.7%.
The normal range of, conentration of fasting blood sugar is 80 to 120 mg/ml; in the testing of true blood sugar, the normal range of concentration is 70 to 100 mg/ml. so normal glucose levels fall between 70 and 150 mg. Higher levels may indicate diseases such as diabetes mellitus.
Entomology is the scientific study of insects. It is derived from the Greek word ‘entomos’ which means – “that which is cut in pieces or engraved/segmented”, hence “insect”.
The ionosphere is a region of Earth’s upper atmosphere, from about 60 km (37 mi) to 1,000 km (620 mi) altitude and includes the thermosphere and parts of the mesosphere and exosphere, it is ionized by solar radiation, plays an important part in atmospheric electricity and forms the inner edge of the magnetosphere. It has practical importance because among other functions, it influences radio propagation to distant places on the Earth.
Coral reefs are underwater structures made from calcium carbonate secreted by corals. Cora’l reefs are colonies of tiny animals found in marine waters that contain few nutrients.
Phytochrome is a photoreceptor, a pigment that plants use to detect light. It is a protein with a bilin chromophore. It detects mainly red and far-red region of the visible spectrum and regulates germination of seeds.
Quenching is a process in which absorbed light energy is dissipated as heat and does not take part in photochemistry. The phenomenon involves quenching of chlorophylla (Chla) fluroescence, which is induced under steady-state illumination.
AIDS virus destroys the T-cells of the immune system. T cells or T lymphocytes belong to a group of white blood cells known as lymphocytes, and play a central role in cell – mediated immunity.
Bragg Spectrometer is an instrument used to analyze crystal structure by using X- rays. In it, a beam of collimated X-rays strikes the crystal, and a detector measures the angles and intensities of the reflected beam.
Alpha particles consist of two protons and two neutrons bound together into a particle identical to a helium nucleus, which is generally produced in the process of alpha decay.
The human body requires more calcium than any other mineral. At least 99% of the calcium is found in the bones and teeth, giving them strength and rigidity.
The sigmoid colon is the part of the large intestine. It forms a loop that averages about 40 cm in length.
A good conductor of electricity while carrying current remains electrically neutral because the total number of electrons and protons always remains same in the
Containment of toxic or hazardous constituents in industrial solid wastes is currently being accomplished using: (i) coating grains of waste material with an inert and non-reactive impervious material (microencapsulation), and (ii) coating blocks of waste material with an inert, non-reactive impervious material (microencapsulation).
UV radiation can be an effective viricide and bactericide. Disinfection using UV radiation is commonly used in wastewater treatment and is finding an increased usage in drinking water treatment.
When cells are exposed to sunlight, radiant energy can damage the DNA. For example, ultraviolet ‘ irradiation cause covalent bond formation between adjacent thymines on the same strand of DNA. Ultraviolet light is absorbed by a double bond in thymine and cytosine bases in DNA.
In order to manufacture silicones, alkyl-substituted chlorosilanes are used as starting material. Since dimethylsilane contains – OH group at the end of the chain, polymerization and chain length increases. However, the hydrolysis of alkyl trichlorosilane gives very complex cross linked polymer.
Examples of natural colloids can be found in our body itself : blood consists of colloidal sized red blood corpuscles (RBC) which carry the vital oxygen to all the body tissues.
Nickel silver, also known as German silver, is a copper alloy with nickel and often zinc. The usual formulations is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated.
Atomic absorption spectroscopy is an analytical chemistry technique used for determining concentration of particular metal element and is widely used in pharmaceutics. It was used for the determination of cobalt in Vitamin 812.
Prof. Ananda Mohan Chakrabarty genetically engineered a new species of Pseudomonas bacteria (“the oil-eating bacteria”) in 1971 while working for the Research & Development Center at General Electric Company in Schenectady, New York.
Devarda’s alloy is an alloy of aluminium (44% – 46%) copper (49% – 51%) and zinc (4% – 6%). Devarda’s alloy is used as reducing agent in analytical chemistry
for the determination ofnitrates after their reduction to ammonia under alkaline conditions. It owes its name to the Italian chemist Arturo Devarda (1859-1944), who synthezised it at the end of the 19th century to develop a new method to analyze nitrate in Chile saltpeter.
Grit chambers are long narrow tanks that are designed to slow down the flow so that solids such as sand, coffee grounds, and eggshells will settle out of the water. Grit causes excessive wear and tear on pumps and other plant equipment. Its removal is particularly important in cities with combined sewer systems, which carry a good deal of silt, sand, and gravel that wash off streets or land.
Cysteine (abbreviated as Cys or C) is an ci-amino acid with the chemical formula HO,CCH(N1-12)CH2SH. It is a semi-essential amino acid, which means that it can be biosynthesized in humans. The thiol side chain in cysteine often participates in enzymatic reactions, serving as a nucleophile.
Neon isa chemical element with symbol Ne and atomic number 10. It is in group 18 (noble gases) of the periodic table. Neon is a colorless, odorless, inert monatomic gas under standard conditions, with about two-thirds the density of air.
The aorta is the largest artery in the human body, originating from the left ventricle of the heart and extending down to the abdomen, where it bifurcates ‘ into two smiller arteries (the common iliac arteries). The aorta distributes oxygenated blood to all parts of the body through the systemic circulation.
Parathyroid hormone (PTH), parathormone or parathyrin, is secreted by the chief cells of the parathyroid glands as a polypeptide containing 84 amino acids. It acts to increase the concentration of calcium (Ca2j in the blood, whereas calcitonin (a hormone produced by the parafollicular cells (C cells) of the thyroid gland) acts to decrease calcium concentration.
Insects, and some other invertebrates, exchange oxygen and carbon dioxide between their tissues and the air by a system of air-filled tubes called tracheae.
In a nuclear reaction, the total (relativistic) energy is conserved. The “missing” rest mass must therefore reappear as kinetic energy released in the reaction; its
source is the nuclear binding energy.
Aannihilation is the process that occurs when a subatomic particle collides with its respective antiparticle to produce other particles, such as an electron colliding with a positron to produce two photons.
In the photoelectric effect, electrons are emitted from solids, liquids or gases when they absorb energy from light. Electrons emitted in this manner may be called
A hodograph of a particle moving with constant velocity is a point, and the corresponding trajectory is a straight line.
Aluminium oxide has a very high melting point (over 2,000°C), so it would be expensive to melt it. Instead, it is dissolved in molten cryolite, an aluminium compound with a lower melting point than aluminium oxide. The use of cryolite reduces some of the energy costs involved in extracting aluminium.
Glucose (C6H1206, also known as D-glucose, dextrose, or grape sugar) is a simple monosaccharide found in plants. It is one of the three dietary monosaccharides.
along with fructose and galactose. that are absorbed directly into the bloodstream during digestion.
Any of the homologous segments, lying in a longitudinal series, that compose the body of certain animals, such as earthworms and lobsters. Also called somite.
Transcription is the process in which a particular segment of DNA is copied into RNA by the enzyme RNA polymerase. During transcription, a DNA sequence is read by an RNA polymerase, which produces a complementary, anti-parallel RNA strand called a primary transcript.
In 1900, the German physicist Max Planck introduced the idea that energy is quantized in order to derive a formula for the observed frequency dependence of the
energy emitted by a black body, called Planck’s law, that included a Boltzmann distribution.
Chitin is a hard, tough substance that occurs widely in nature, particularly in the shells (exoskeletons) of arthropods such as crabs, insects and spiders. The walls of hyphae are composed of slightly different chitin. Chemically chitin is a polysaccharide, derived from glucose.
Recently scientists in China sequenced the DNA of the wild bactrian camel, to study camel’s salt tolerance. Camels consume eight times more salt than cattle or sheep and have twice the blood glucose levels of other ruminants.
Succulent plants store water in their stems or leaves. They include the Cactaceae family, which has round stems and can store a lot of water. The leaves are often vestigial, as in the case of cacti, wherein the leaves are reduced to spines, or they do not have leaves at all. Water is stored in the bulbs of some plants, at or below ground level. They may be dormant during drought conditions and are, therefore, known as drought evaders.
Thorium is an element which are used in radioactive chemicals and is non-renewable where as all other three options are power generating systems which are regenerated.
Archegonium i s th e female reproductive organ in ferns and mosses. An archegonium also occurs in some gymnosperms, e.g., cycads and conifers. A flask-shaped structure, it consists of a neck, with one or more layers of cells, and a swollen base-the venter – which contains the egg.
Trochodendron is a genus of flowering plants with one living species, Trochodendron aralioides, and six extinct species known from the fossil record.
A Caesarean section (often C-section) is a surgical procedure in which one or more incisions are made through a mother’s abdomen (laparotomy) and uterus (hysterotomy) to deliver one or more babies. The first modern Caesarean section was performed by German gynecologist Ferdinand Adolf Kehrer in 1881. But in ancient medical history Julius Caesar was the first person to be borne by this method and thus the operation named after him.
Study of ants is called Myrmecology.
A Reverse transcriptase (RT) is an enzyme used to generate complementary DNA (cDNA) from an RNA template, a process termed reverse transcription. RT is needed for the replication of retroviruses (e.g., HIV), and RT inhibitors are widely used as antiretroviral drugs.
Fleming’s right-hand rule (for generators) shows the direction of induced current when a conductor moves in a magnetic field. The right hand is held with the thumb, first finger and second finger mutually perpendicular to each other (at right angles).
The watt (symbol: W) is a derived unit of power in the International System of Units (SI), named after the Scottish engineer James Watt (1736-1819).
The NIOSH states “Under dry conditions, the resistance offered by the human body may be as high as 100,000 Ohfhs. Wet or broken skin may drop the body’s resistance to 1,000 Ohms,” adding that “high- voltage electrical energy quickly breaks down human skin, reducing the human body’s resistance to 500 Ohms.”
The critical temperature for superconductors is the temperature at which the electrical resistivity of a metal drops to zero. The transition is so sudden and complete that it appears to be a transition to a different phase of matter; this superconducting phase is described by the BCS theory.
Brass is an alloy made of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties.
Wrought iron is an iron alloy with a very low carbon content, in comparison to steel, and has fibrous inclusions, known as slag. This is what gives it a “grain” texture resembling wood, which is visible when it is etched or bent to the point of failure. Wrought iron is tough, malleable, ductile and easily welded.
Galvanization, or galvanisation, is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanization, in which parts are submerged in a bath of molten zinc.
A homogeneous mixture is a type of mixture in which the composition is uniform and every part of the solution has the same properties. A homogeneous mixture in which there is both a solute and solvent present is also a solution.
The plant epidermis consists of three main cell types: pavement cells, guard cells and their subsidiary cells that surround the stomata.
As sugar concentration increases in the guard cells, as a result water enters the guard cells. The guard cells become turgid (swollen with water). The thin outer walls bulge out and force the inner wall into a crescent shape. In this way a stoma or pore is formed between each pair of guard cell.
Mahyco, an Indian seed company based in Jalna, Maharashtra, has developed the Bt brinjal. The genetically modified brinjal event is termed Event EE 1 and Mahyco have also applied for approval of two brinjal hybrids.
Electric current is measured using a device called an ammeter.
Photoperiodism is the physiological reaction of organisms to the length of day or night. It occurs in plants and animals. It affects Flowering,Vegetative growth and fruiting in plants.
The correct match is as follows: Ascorbic acid- Vitamin C Chlorophyll- Photosynthetic pigment Carotenoid- Quencher Superoxide dismutase- Enzyme
Allantois is a membrone around developing embryo which is primarily involved in nutrition exchange and excretion.
Haliotis belongs to Mollusca.
Although most DNA is packaged in chromosomes within the nucleus, mitochondria also have a small amount of their own DNA. This genetic material is known as mitochondrial DNA or mtDNA
First class proteins contain all the essential amino acids in sufficient amounts. Animal proteins obtained from milk, egg, fish, meat etc. are first class proteins. These are also called adequate proteins.
Needle exerts more pressure than nail on the balloon.
The speed of sound is greater in moist air than in dry air because moist air have larger density than dry air. Velocity of sound is directly proportional to the density of the medium in which it travels.
X rays are frequently used to check the defects in Diamonds and other precious stones.
When ice is kept on saw dust then it does not melt quickly as it’s an insulator of heat and air does not circulate in good insulators. So, it prevents ice from melting quickly.
When a drop of Glycerol is added to crushed KMnO4 spread on a paper there is a violent explosion.
A bleaching agent is a material that lightens or whitens a substrate through chemical reaction. The most common bleaching agents generally fall into two categories: chlorine and its related compounds (such as sodium hypochlorite) and the peroxygen bleaching agents, such as hydrogen peroxide and sodium
Alpha particles are the least penetrating as they are the most densely ionizing. The penetrating power of nuclear radiation depends upon the ionizing power of
the radiation. The more local ised the ionization the less penetrating power it will possess.
Hydrogen- peroxide is an effective sterilizing agent. Water results when it readily loses active oxygen.
The maximum fixation of solar energy is done by green plants.The energy is stored in the plants as carbohydrates for their metabolic activities as growth ,respiration etc.
The term ‘brown air’ is used for photochemical smog. The brown color is cause by the presence of a various Nitrous Oxides.
Peroxyacetyl nitrate is a secondary pollutant present in photochemical smog. It is thermally unstable and decomposes into peroxyethanoyl radicals and nitrogen
Wave particle duality is a quantum mechanics ef1ct. It means the electron sometimes acts like a particle and sometimes it acts like a wave. It depends on the
Vitamin B12 consists of a class of chemically related compounds (vitamers). It contains the biochemically rare element cobalt.
In 1904 the German agronomist and plant physiologist Lorenz Hiltner first coined the term “rhizosphere” to describe the plant-root interface, a word originating in part from the Greek word “rhiza”, meaning root. Hiltner descrjbed the rhizosphere as the area around a plant root that is inhabited by a unique population of
microorganisms influenced, he postulated, by the chemicals released from plant roots.
Reverse transcription were discovered by Howard Temin and independently isolated by David Baltimore.
Steam will produce more severe burns than boiling water because steam has more heat energy than water due to its latent heat of vaporisation.
Fructose is the sweetest of all natural sugar types.
Zone melting, any of a group of techniques used to purify an element or a compound or control its composition by melting a short region (1:C., zone) and causing this liquid zone to travel slowly through a relatively long ingot, or charge, of the solid.
is the biological conversion of nitrate to nitrogen gas, nitric oxide or nitrous oxide. These compounds are gaseous compounds and are not readily available for microbial growth; therefore they are typically released to the atmosphere.
Holstein Friesians are a breed of cattle known today as the world’s highest-production dairy animals. They are found in Europe and America.
Coagulation removes dirt and other particles suspended in water. Alum and other chemicals are added to water to form tiny sticky particles called “floe” which attract the dirt particles. The combined weight of the dirt and the alum (floe) become heavy enough to sink to the bottom during sedimentation.
Retroviral integrase (IN) is an enzyme produced by a retrovirus (such as HIV) that enables its genetic material to be integrated into the DNA of the infected cell.
High grade (HG) and ultra high grade (UHG) anthracite are the highest grades of anthracite coal.
Anemometer is an instrument for measuring the speed of the wind, or of any current of gas.
The retina of the eye has two types of light-sensitive cells called rods and cones. Both are found in the retina which processes images. Rods work in low light conditions to help night vision, but cones work in daylight and are responsible for colour discrimination.
Leaves being green in color reflect green color and therefore is least absorbed during the process of photosynthesis.
A parsec (symbol: pc) is a unit of length used to measure large distances of objects outside our Solar System.
Phenol, also known as carbolic acid, is an aromatic organic compound with the molecular formula C6HJOH. It is a white crystalline solid that is volatile. The molecule consists of a phenyl group (-C6H5) bonded to a hydroxyl group (OH).
It grows larger until puberty and then begins to shrink. The gland produces thymosins, which are hormones that stimulate the development of antibodies.
Lichens can be used as air pollution indicators, especially of the concentration of sulfur dioxide in the atmosphere. Lichens are plants that grow in exposed places such as rocks or tree bark. They need to be very good at absorbing water and nutrients to grow there.
Irrigation salinity is the rise in saline groundwater and the build-up of salt in the soil surface in irrigated areas. It is caused by using large volumes of irrigation water that locally raise groundwater levels and mobilise salt. Irrigation salinity is made worse when water used to irrigate is from salty sources.
Saffron, a spice derived from the dried stigmas of the saffron crocus a small plant about a foot tall. Each flower has three female parts (stigmas) two male parts (stamens), each stigmas is red or dark red in color towards the top and yellow towards the bottom of the stigma, where it is attached to the flower.
Red light scatters much less than lights of other color due to its greater wavelength.
The basic unit of nervous system is known as neuron. The nervous system consists of nerves, brain and spinal cord. They control the working of various organs of the body. The part of brain and spinal cord is called the Autonomic Nervous System.
Acellulosicwallisfoundinthecellsofplants.Cellulose is an important structural component of the primary cell wall of green plants, many forms of algae and the oomycetes. Some species of bacteria secrete it to form biofilms. Cellulose is the most abundant organic polymer on Earth.
The filtration unit of kidney is known as nephron. Kidneys filter the nitrogenous waste products of the body through nephron and throw them out in the form of urine. Kidneys and skin are the chief organs of excretion.
The nutritive tissue in the seeds of higher plants is known as endosperm. Endosperm is the tissue produced inside the seeds of most flowering plants around the time of fertilization. It surrounds the embryo and provides nutrition in the form of starch, though it can also contain oils and protein.
Yeast is an important source of vitamin B. Yeasts is eukaryotic microorganisms classified in the kingdom Fungi, with 1,500 species (estimated to be 1% of all fungal species). Yeasts are unicellular, although some species with yeast forms may become multicellular through the formation of strings of connected budding cells known as pseudohyphae, or false hyphae, as seen in most molds.
Enzymes are proteins. Enzymes are large biological molecules responsible for the thousands of metabolic processes that sustain life. They are highly selective catalysts, greatly accelerating both the rate and specificity of metabolic reactions, from the digestion of food to the synthesis of DNA. Most enzymes are proteins, although some catalytic RNA molecules have been identified.
Heating of ore below its melting point in the absence of air is known as calcinations. Calcinations is a thermal treatment process in presence of air or oxygen applied to ores and other solid materials to bring about a thermal decomposition, phase transition, or removal of a volatile fraction
The most electronegative element among the following is fluorine. Fluorine is a chemical element with symbol F and atomic number 9. It is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. As the most electronegative element, it is extremely reactive: almost all other
elements, including some noble gases, form compounds with fluorine.
NH4C1 is the compound which possesses ionic, covalent and coordinate bonds. Ammonium chloride, an inorganic compound with the formula NH4C1, is a white crystalline salt, highly soluble in water. Solutions of ammonium chloride are mildly acidic. Sal ammoniac is a name of the natural, mineralogical form of ammonium chloride
The depletion of Ozone layer is mainly due to chlorofluorocarbons. A chlorofluorocarbon is an organic compound that contains only carbon, chlorine, and fluorine, produced as a volatile derivative of methane, ethane, and propane. They are also commonly known by the DuPont brand name Freon.
Bacterium is associated with tuberculosis, Fungus with ringworm, Protozoan with kaala-azaar and virus with influenza.
Matter waves are de Broglie waves. In quantum mechanics, the concept of matter waves or de Broglie waves reflects the wave-particle duality of matter. The theory was proposed by Louis de Broglie in 1924 in his PhD thesis. The de Broglie relations show that the wavelength is inversely proportional to the momentum of a particle and is also called de Broglie wavelength.
When the milk is churned vigorously, the cream is separated out due to centrifugal force. Centrifugal force is the apparent force that draws a rotating body away from the center of rotation. It is caused by the inertia of the body as the body’s path is continually redirected.
Gas thermometers are more sensitive than liquid thermometers because the gases have large coefficient of expansion. Coefficient of Thermal expansion is the tendency of matter to change in volume in response to a change in temperature, through heat transfer. When a substance is heated, its particles begin moving more and thus usually maintain a greater average separation.
Sun appearing red at sunset is not caused by atmospheric refraction of light. Refraction is essentially a surface phenomenon. During sunrise and sunset, the rays have to travel a larger part of the atmosphere because they are very close to the horizon. Therefore, light other than red is mostly scattered away. Most of the red light, which is the least scattered, enters our eyes. Hence, the sun and the sky appear red.
Morphine is the most abundant opiate found in opium, the dried latex from unripe seedpods of Papaver somniferum (the opium poppy).
Efforts by the U.S. Soil Conservation Service to promote contouring in the 1930s as an essential part of erosion control eventually leading to its widespread adoption. The practice has been proved to reduce fertilizer loss, power and time consumption, and wear of machines, as well as to increase crop yields and reduce erosion. Contour farming is most effective when used in conjunction with such practices as strip cropping, terracing, and water diversion.
Glucose has the molecular formula C6H1206 and is thus a hexose sugar.
Bacteria are prokaryotes, which, by definition, are cells that don’t possess membrane-bound organelles. Mitochondria are membrane-bound organelles.
The rainbow comes from the reflection and refraction of the sunlight in the falling drops; its colors are mainly due to dispersion, which means that the refractive index of water depends on the wavelength of light.
When a ray of light falls on sea shell, then its small amount gets refracted (slightly polarised) and rest almost gets reflected back (fully polarised).
An object covers distance which is directly proportional to the square of the time. Its acceleration is constant.
If the horizontal range of a projectile is four times its maximum height, the angle of projection ¡s 45 degrees. Range is the total horizontal distance covered during
u2 sin 20 the time of flight. It is calculated as , where g O is the angle of projection.
Mercury has the least melting point of the following metals (—38.83°C). Gold, silver and copper have 1064°C, 961.8°C and 1085°C respectively.
Marsh Gas or methane gas is produced when vegetation decomposes in water. Methane, also called marsh gas, colourless, odourless gas that occurs abundantly in nature as the chief constituent of natural gas, as a component of fire damp in coal mines, and as a product of the anaerobic bacterial decomposition of
vegetable matter under water.
In cactus, spines are modified leaves, and thorns are modified branches.
Mycoplasma are the smallest bacterial cells yet discovered, can survive without oxygen and are typically about 0.1 im in diameter.
Biodiversity can be thought of as the genetic library that keeps life going on Earth. Biodiversity, short for biological diversity, is the term used to describe the variety of life found on Earth and all of the natural processes. This includes ecosystem, genetic and cultural diversity, and the connections between these
and all species.
Boiling point of water is lower at higher altitudes due to the decreased air pressure. Boiling point of water changes with altitude because atmospheric pressure
changes with altitude.
Sodium thiosuiphate, also called sodium hyposuiphite or “hypo” is used as a photographic fixer in photography.
Stalactites and Stalagmites are fornied due to the precipitation of Calcium carbonate (CaCO3).
Hermaphroditism is a form of sexual reproduction in which an organism can self-fertilize or mate with another. individual of the same species.
Lyman series of hydrogen atom spectral lines in the Ultraviolet.
An electric battery is a devices consisting of two or more electrochemical cells that convert stored chemical energy into electrical energy.
The area reserved for the welfare of wildlife is called National Park.
Mongoloid is a term used for all or some peoples indigenous to East Asia, Central Asia, Southeast Asia, North Asia, South Asia, the Arctic, the Americas, the
Pacific Islands, and other lesser occurrences in other regions. Individuals within these populations often share certain associated phenotypic traits, such as epicanthic folds (skin folds covering the corners of the eyes), sinodonty and neoteny (retaining more juvenile physiological traits).
Turner Syndrome, represented by 44A + XO. This occurs in females in which one of the X-chromosoms is missing.
Myopia also known as short sightedness is a condition of the eye where one looking at a distant object seems a little out of focus.
In the process of photosynthesis, phytoplankton release oxygen into the water. Half of the world’s oxygen is produced from phytoplankton photosynthesis. The other half is produced via photosynthesis on land by trees, shrubs, grasses and other plants.
Rate of transpiration increases in hot, dry and windy condition. Dry, windy weather provides a favorable condition for evaporation to take place on the surface
Collateral Bundle is a type of vascular bundle in which the phloem and xylem lie on the same radius, with the phloem located towards the periphery of the stem and xylem towards the centre.
The Planck constant has dimensions of physical action, these are the same as those of angular momentum. In SI units, the Planck constant is expressed in joule
All living organisms are made up of biomolecules which has carbon as an important constituent.
Polarization is a property of waves that can oscillate with more than one orientation. Electromagnetic waves such as light exhibit polarization, as do some other
types of wave, such as gravitational waves.
Minamata disease is a neurological syndrome caused by severe mercury poisoning.
Gold is often referred as king of metals.
Fermi is the unit of length used to measure nuclear distances. The unit is named after the Italian physicist Enrico Fermi.
Christmas factor or factor IX is one of the proteases of the coagulation system.
Highly concentrated sources of oxygen promote rapid combustion. Fire and explosion hazards exist when concentrated oxidants and fuels are brought into close proximity, however, an ignition event, such as heat or a spark, is needed to trigger combustion. Oxygen itself is not the fuel, but the oxidant.
The Dumas method in analytical chemistry is a method for the quantitative determination of nitrogen in chemical substances based on a method first described by Jean-Baptiste Dumas in 1826.
Deoxyribonucleic acid (DNA) is a molecule that encodes the genetic instructions used in the development and functioning of all known living organisms and many viruses. DNA is a nucleic acid; alongside proteins and carbohydrates, nucleic acids compose the three major macromolecules essential for all known forms of life.
A steroid hormone (abbreviated as sterone) is a steroid that acts as a hormone. Steroid hormones can be grouped into five groups by the receptors to which they bind: glucocorticoids, mineralocorticoids, androgens, estrogens, and progestogens. Vitamin D derivatives are a sixth closely related hormone system with homologous receptors, though they are technically sterols rather than steroids. Steroid hormones help control metabolism, inflammation, immune functions, salt and water balance, development of sexual characteristics, and the ability to withstand illness and injury.
Nematocyst is’minute, elongated, or spherical capsule produced exclusively by members of the phylum Cnidaria (e.g., jellyfish, corals, sea anemones). Several such capsules occur on the body surface. Each is produced by a special cell called a cnidoblast and contains a coiled, hollow, usually barbed thread, which quickly turns outward (i.e., is everted) from the capsule upon proper stimulation. The purpose of the thread, which often contains poison, is to ward off enemies or to capture prey.
Lactobacillus, also called Doderlein’s bacillus, is a genus of Gram-positive facultative anaerobic or microaerophilic rod-shaped bacteria.
Chlorophyll is a green pigment found in cyanobacteria and the chloroplasts of algae and plants. Its name is derived from the Greek words chloros (“green”) and phyllon (“leaf”). Chlorophyll is an extremely important biomolecule, critical in photosynthesis, which allows plants to absorb energy from light. It contains magnesium.
n physics, the kinetic energy of an object is the energy which it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes.
The ozone layer is a layer in Earth’s atmosphere that absorbs most of the Sun’s UV radiation. It contains relatively high concentrations of ozone (03), although
it is still very small with regard to ordinary oxygen, and is less than ten parts per million, the average ozone concentration in Earth’s atmosphere being only about
0.6 parts per million. The ozone layer is mainly found in the lower portion of the stratosphere from approximately 20 to 30 kilometres (12 to 19 mi) above Earth, though the thickness varies seasonally and geographically.
Airlift pumps are often used in deep dirty wells where sand would quickly abrade mechanical parts. (The compressor is on the surface and no mechanical parts are needed in the well). However airlift wells must be much deeper than the water table to allow for submergence. Air is generally pumped at least as deep under the water as the water is to be lifted. (1f the water table is 50 ft below, the air should be pumped 100 feet deep).
The passenger-side mirror on a caris typically a convex mirror. ¡n some countries, these are labeled with the safety warning “Objects in mirror are closer than they
appear”, to warn the driver of the convex mirror’s distorting effects on distance perception. Convex mirrors are preferred in vehicles because they give an upright, though diminished, image. Also they provide a wider field of view as they are curved outwards.
Gamma radiation, also known as gamma rays, refers to electromagnetic radiation of extremely high frequency and therefore high energy per photon. Gamma rays are ionizing radiation, and are thus biologically hazardous.
Ozone layer shields earth from UV radiation – Ionosphere layer allows radio waves to be bounced off and radios to work.
Bacillus Calmette-Guérin is a vaccine against tuberculosis that is prepared from a strain of the attenuated live bovine tuberculosis bacillus, Mycobacteriuni bovis, that has lost its virulence in humans.
A greenhouse gas (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The primary greenhouse gases in the Earth’s atmosphere 395 are water vapour, carbon dioxide, methane, nitrous oxide, and ozone.
Hydrogen bomb is based on the principle of nuclear fusion. Hydrogen bomb or H-bomb, weapon deriving a large portion of its energy from the nuclear fusion of hydrogen isotopes. The hydrogen bomb functions by the fusion, or joining together, of lighter elements into heavier elements. The end product again weighs less than its components, the difference once more appearing as energy. Because extremely high temperatures are required in order to initiate fusion reactions, the hydrogen bomb is also known as a thermonuclear bomb.
The commonly used safety fuse wire is made up of an alloy of tin and lead. Fuse is a safety device used in any electrical installation, which forms the weakest link
between the supply and the load. ¡t is a short length of wire made of lead / tin /alloy of lead and tin! zinc having a low melting point and low ohmic losses. A fuse wire should always have a high resistance and low melting point. High resistance to heat up soon and low melting point to melt away due to the heat produced by high resistance so that the circuit is not damaged.
When cooled from room temperature liquid water becomes increasingly dense like other substances, but at approximately 4 oc (39 °F), pure water reaches its maximum density. As it is cooled further, it expands to become less dense.
The linear expansion of a solid rod is independent of the time of heat flow. It is directly dependent on the temperature, length of the rod and material of the rod.
X-rays are produced as a result of obstruction of cathode rays with metal.
Aristotle is the father of I3iology and Zoology.
the smallest unit of classification is species. The hierarchy of biological classification’s major taxonomie ranks is as follows: species< genus< family < order< class< phylum < kingdom < domain.
Aerenchyma refers to spaces or air channels in the leaves, stems and roots of some plants, which allows exchange of gases between the shoot and the root.Aerenchyma is widespread in aquatic and wetland plants which must grow in hypoxic soils.
Night blindness is the first sign of vitamin A deficiency. Night blindness and its worsened condition, . xerophthalmia, are markers ofvitamin A deficiency, as it can also lead to impaired immune function, cancer, and birth defects.
Cloves are the aromatic flower buds of a tree in the family Myrtaceae, Syzygium aromaticum. They are native to the Maluku Islands in Indonesia, and are commonly used as a spice.
Heating gypsum partially dehydrates the mineral by driving off approximately 75% of water contained in its chemical structure. The partially dehydrated mineral is called calcium sulfate hemihydrate or calcined gypsum commonly known to be Plaster of Paris.
Neutron was discovered by a British Physicist named Sir James Chadwick. In 1932, Chadwick showed that the radiation from the element beryllium, caused by the bombardment of alpha particles is actually a stream of electrically neutral particles. He called these particles neutrons. He also studied some other properties of these particles. Neutrons directly emitted from atomic nuclei are termed as fast neutron.
Carbonated beverages like soda get their name from the carbon dioxide dissolved in the beverage. Most gases will dissolve in water (which is the main component of soda) but carbon dioxide is particularly good at dissolving and it adds a slightly sour taste to the beverage. It may also be added to make it reminiscent of the carbonation found in fermented beverages like champagne.
Biogas is a clean unpolluted and cheap source of energy in rural areas. It consists of 55-70% methane which is inflammable. Biogas is produced from cattle dung in a biogas plant commonly known as gobar gas plant through a process called digestion.
Carbon credit is a permit which allows a country or organization to produce a certain amount of carbon emissions and which can be traded if the full allowance is not used. It is associated with protection of environment.
A green leaf is green because of the presence of a pigment known as chlorophyll, which is inside an organelle called a chloroplast.
Temperature is measured by a thermometer. One of the most common devices for measuring temperature is the glass thermometer. This consists of a glass tube filled with mercury or some other liquid, which acts as the working fluid. Temperature increase causes the fluid to expand, so the temperature can be determined by measuring the volume of the fluid. Such thermometers are usually calibrated so that one can read the temperature simply by observing the level of the fluid in the thermometer.
At 25° C the pH of pure water is very close to 7. Acids have a pH less than 7 while bases have a pH greater than 7. Because it has a pH of 7, water is considered to be neutral. It is neither an acid nor a base, but is the reference point for acids and bases.
Distillation is a process of separating the component substances (impurities) from a liquid mixture by selective evaporation and condensation. The end result is pure water.
H2S04 is the sulphuric acid which is a highly corrosive strong mineral acid. It cannot be used in food industry as a preservative.
The deep red colour that is present in tomatoes, pink grapefruit, guava and watermelon is caused by lycopene, a carotenoid.
When a person cries there is a watery discharge from the nose due to activation of lachrymal fluid through nasal cavity.
The functions of root hairs is to collect water and mineral nutrients present in the soil and take this solution up through the roots to the rest of the plant. As root hair cells do not carry out photosynthesis as they do not contain chloroplasts.
In agriculture, a catch crop is a fast-growing crop that is grown simultaneously with, or between successive plantings of a main crop.
Carotenoids protect the plant from damage from UV light and this protection is attributed to their antioxidant properties: they are able to absorb the harmful oxidative chemicals produced during photosynthesis, the process whereby plants make energy from sunlight.
The substance that causes the worst air pollution is carbon monoxide (CO). Carbon monoxide combines with hemoglobin ofblood to form carbaminohemoglobin which fails to carry oxygen to body tissues, causing oxygen starvation.
Pyrolysis is a thermo-chemical decomposition of organic material at elevated temperatures in the absence of oxygen (or any halogen). Pyrolysis generally takes place well above atmospheric pressure at temperatures exceeding above 430 °C.
Light is made up of photons, so it has some particle properties. In the photoelectric effect light hits some material which absorbs it and then ejects incident electrons. The reason that the photoelectric effect is evidence for the particle nature of light has to do with how materials absorb that light energy and then eject it in the form of electrons.
The heaviest element in terms of heaviest per a given number of atoms is the element with the highest atomic weight. This is the element with the largest number of protons, which is presently element 118, ununoctium. Unnoctium is the heaviest element, but it is man-made. The heaviest naturally-occurring element is uranium (atomic number 92, atomic weight 238.0289).
Haptens are small molecules that react with a specific antibody but cannot induce the formation of antibodies unless bound to a carrier protein or other large antigenic molecule. They are incomplete or partial antigens.
Sulphur dioxide gas exhibits bleaching properties in presence of moisture. It dissolves in water liberating nascent hydrogen. Nascent hydrogen removes oxygen atoms from thecoloring matter (reduces coloring matter) and it loses its color.
Zirconium is a lustrous, grey-white strong transition metal that resembles titanium. Zirconium is mainly used as a refractory and opacifier, although it is used in small amounts as an alloying agent for its strong resistance to corrosion.
Plant wilting occurs after excessive loss of water by transpiration and lesser absorption. On a hot day, plants transpire heavily and cannot absorb water speedily to keep pace with transpiration loss, even when there is enough water.
Gypsum is calcium sulphate which is essential to the sustainability of most irrigated soils. Irrigated land eventually leads to sodicity and salinity unless extreme care is taken. It improves sodic (saline) soils by removing sodium from the soil and replacing it with calcium.
The Electromagnetic spectrum in order of decreasing energy, thus increasing wavelength : Gamma Rays- wavelength: 0.01 nm: X-rays -1 nm; Ultra-violet Rays- 0.1 micrometres ; Visible Light-Red light : 0.7 micrometres. Violet Light: 0.4 micrometres; Infrared Radiation-0.01 mm ; Microwaves -less than 10 cm. usually 1 cm: Radiowaves- Long, Medium and Short Waves : 2 km-10 m ; and Very High frequency (VHF) and Ultra High Frequency (UHF): 10 m-10 cm.
Eutrophication is the eco-system response to the addi¬tion of artificial or natural substances, such as nitrates and phosphates through fertilizers or sewage to an aquatic system. One example is the “bloom” or great increase of phytoplankton in a water body as a response to increased levels of nutrients.
The wings are modified forelimbs of birds which are the key to bird flight. Each wing composed of three limb bones, the humerus, ulna and radius.
Entropy and enthalpy together make a new quantity, the Free Energy which, under conditions of constant temperature and pressure, determines the direction of spontaneous change. All spontaneous processes have a negative change in free energy.
Sandstone can be turned into a metamorphic rock by being either heated up to a point where it undergoes a significant change or subjected to high pressures, or subjected to chemically active fluids, or some combination thereof. A common result of the metamorphosis of sandstone is the creation of quartzite.
A Sonometer is a device for demonstrating the relationship between the frequency of the sound produced by a plucked string, and the tension, length and mass per unit length of the string. These relationships are usually called Mersenne’s laws after Marin Mersenne (1588-1648), who investigated and codified them.
Polio is a highly infectious disease caused by a virus. Its causative agent, poliovirus, was identified in 1908 by Karl Landsteiner. The polio virus invades the nervous system, and can cause total paralysis.
It is generally considered that the Panda belongs to the bear family, though differences persist. Some DNA studies have shown that the giant panda is closer to the bear family while the red panda is indeed closer to the raccoon family.
The pancreas is a glandular organ in the upper abdomen, but it serves as two glands a digestive exocrine gland and a hormone-producing endocrine gland. Functioning as an exocrine gland, the pancreas produce enzymes to break down the proteins, lipids, carbohydrates, and nucleic acids in food. Functioning as an endocrine gland, the pancreas secretes the hormones insulin and glucagon to control blood sugar levels throughout the day.
Due to the action of motor cells at the base of the petiole and leaflets, the leaves of touch me not plant closes. The motor cells are activated by touch of the sensitive hairs present on the surface of touch-me-not plant. Like a number of other plant species, it undergoes changes in leaf orientation termed “sleep” or nyctinastic movement. The foliage closes during darkness and reopens in light.
The theoretical basis for plant tissue culture was proposed by botanist Gottlieb Haberlandt in 1902 on his experiments on the culture of single cell.
Beak is technically only the external surface of a bird’s mouth. The entire mouth structure of a bird is called the bill. The bill (or rostrum) consists of a bony framework, a vascular layer containing the blood vessels and nerves, a layer of connective tissue, which “glues” the beak to the bones, and the beak, which is the outer sheath covering the jaw bones. The beak is composed ofkeratin – the same tough, insoluble protein found in fingernails, hoofs, antlers and horns.
External ear is present in Mammals. Many mammals can move the pinna (with the auriculares muscles) in order to focus their hearing in a certain direction in
much the same way that they can turn their eyes. Most humans, unlike most other mammals, do not have this ability
Archimedes used the principle of buoyancy to find the purity of gold. According to which a body immersed in fluid experiences a buoyant force equal to the weight
of the fluid it displaces. With the help of this principle, the density of the golden crown and solid gold was compared by balancing the crown on a scale with a reference piece, this set up is then immersed in water. If the crown is less dense than gold, it will displace more water, and thereby will experience a greater buoyant
The kinetic energy of a non-rotating object of mass m 12 traveling ata speed vis j.mv . Ifm and vare increased to twice its magnitude, then K.E= Y2 x 2m x 2v X 2v
12 —mv (8) =8 times kinetic energy.
The gravitational force is inversely proportional to the square of the distance: If you double the distance between the two bodies, the force of gravity is reduced to one-fourth its original value.
Stationary wave can occur because the medium is . moving in thoopposite direction to the wive, or it can arise in a stationary medium as a result of interference
between two waves travelling in opposite directions
Two oxygen atoms can both achieve stable structures by sharing two pairs of electrons joined in a double bond. 0=0. Each line represents one pair of shared electrons.
Helium is used by deep sea divers in their diving tanks as a substitute of nitrogen. The trouble with nitrogen in this situation is that nitrogen is a fairly heavy gas, and is soluble in blood at high pressure. Long term use of nitrogen can cause a strange sense of euphoria, or well being called nitrogen narcosis. This is a bit like being drunk, and makes the diver unable to assess dangers. Divers who work at depth or for long periods use a mixture of 20% Oxygen and 80% Helium. Helium is used for a number of reasons – It is light, cheap, and does not dissolve in blood the same way that nitrogen does. Being inert it cannot be toxic to the diver or corrosive to equipment.
The atomic number of uranium is 92, and the mass number of the isotope is given as 238. Therefore, it has 92 protons, 92 electrons, and 238 -92 = 146 neutrons.
Auxanometer measures root pressure which is developed in the xylem of the roots . The auxanometer measures plant growth as well as the pressure developed within the xylem cells of roots.
Cell becomes turgid because of endosmosis. Plant cells need to be turgid (i.e. rigid) to support plant tissues. Plant cells become turgid when the concentration inside the cell is higher than outside. Therefore water moves into the cell by osmosis, and the vacuole swells and pushes against the cell wall. Endosmosis is the movement of water molecules from outside to inside of a cell through osmosis process.
Imbibition is a process by which a photographic print is produced by absorption of a water-soluble dye by a relief image or a differentially absorbing image in gelatin or a similar medium or in which a previously formed dye image is transferred by absorption from one layer into another layer
A physical phenomenon known as osmosis causes water to flow from an area of low solute, high water concentration to an area of high solute, low water concentration, until the two areas have an equal ratio of solute to water. Normally, the solute diffuses toward equilibrium as well; however, all cells are surrounded by a lipid bilayer cell membrane which permits the flow of water in and out of the cell but restricts the flow of solute under many circumstances. As a result, when a cell is placed in a hypotonic solution, water rushes into the membrane, increasing the cell’s volume.
Chemotherapy is the use of medicines or drugs to treat cancer.
Oxygen is the most abundant element, making up about 47% of the earth’s mass.
Edward Jenner is often called “the father of immunology”.
Potash Alum is used to reduce bleeding in minor cuts and abrasions, nose bleeds, and haemorrhoids.
Interferon is produced by the body’s cells as a defensive response to viruses.
The first law of thermodynamics is a version of the law of conservation of energy.
Tomato, wheat, grass are few examples of herbs.
Lizards, snakes, crocodiles and tortoises belong to the reptile group.
Tensiometers are devices that measure soil moisture tension.
The SI unit of force is the newton, symbol N.
Substances become bad conductors of heat when they contain a large number of free electrons. Glass, asbestos, wood, cork, cotton wool and air are some examples of Bad conductor.
Many oxidation-reduction reactions are as common and familiar as fire, the rusting and dissolution of metals, the browning of fruit, and respiration and photosynthesis-basic life functions.
A Cation is an ion or group of ions possessing a positive
charge and having th? natural ability to move toward the negative electrode in electrolysis. Sulphate ion doesn’t in this group.
The main components of photochemical smog are
nitrogen oxides, Volatile Organic Compounds (VOCs), tropospheric ozone, and PAN (peroxyacytyl nitrate). Chlorine oxide is not a component of Smog.
An axillary bud is a sprout that develops in the axil of a plant, which is the angle formed by the upper side of the stem and an outgrowing leaf or branch.
The basic function of xylem is to transport waterfrom roots to shoots and leaves, but it also transports some nutrients.
Whittaker proposed an elaborate five kingdom classification – Monera, Protista, Fungi, Plantae and Animalia.
Newton’s first law of motion: An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. This law is also called Galileo’s law of falling bodies.
A thermocouple is a device used extensively for measuring temperature. It is best suited for measuring the temperature inside metallurgical furnace.
The acid produced by ants bite is called formic acid.
Solid sol is a type of colloid Examples of Solid sol are Pumice stone, Foam rubber etc.
Itai-Itai disease was caused by Cadmium in the sea area of japan.
Cows are known as “ruminants” because the largest pouch of the stomach is called the rumen. Cattles store grass in it after swallow.
Red blood cells (Hemoglobin) transports oxygen to all the parts of the body and ultimately to all the cells.
The primary function of the kidney is to remove nitrogenous wastes (mainly urea) from the body.
Light does travel around corners a little. This effect is called diffraction.
It is due to the phenomena of’total internal reflection.
Weak bonds are those forces of attraction that, in biological situations, do not take a large amount of energy to break. For example, hydrogen bonds are broken by energies in the order of 4 – 5 kcal/mol.
Above reaction is the example of neutralization reaction. It happens when an acid and a base react to form water and a salt and involves the combination of H+ ions and OH- ions to generate water.
The Bishnois are considered as the first environmentalists of India. It was started in 1485AD by Saint Guru Jambheshwar in the Thar Desert of Rajasthan, India. It was started against of cutting of trees.
Cinnamon is obtained from barks of the plants.
The body manufactures insulin in the pancreas, and the hormone is secreted by its beta cells, primarily in response to glucose.
The only Pulmonary arteries carry impure blood to human heart.
The light travels straight as long as it is in the water, but if it emerges obliquely from the water into the air it is bent downward toward the surface. This bending is
known as refraction, and this is the main cause that water tank appear shallower when viewed from the top.
In light, yellow is a secondary color, and is made by combining Red and Green.
An endothermic reaction is any chemical reaction that absorbs heat from its environment.
Besides Bauxite, CryoLlite (Na3Alf6) is also the ore of Aluminiwn
Bhopal gas tragedy occurred on the night of 2—3 December 1984 at the Union Carbide India Limited (UCIL) pesticide plant. Over 500,000 people were exposed to methyl isocyanate (MIC) gas and other chemicals.
Bile is stored in Gall bladder after being secreted from Liver.
Others are connective Tissue but Cardic muscle is an involuntary, striated muscle that is found in the walls of the heart.
Normally, human heart beats 72 times a minute.
Muscle fatigue occurs due to accumulation of Lactic acid which is an organic compound formed when there is anaerobic energy production at high rates.
The inexhaustible source of energy of stars is due to conversion of hydrogen to helium.
Gamma Rays are penetrating electromagnetic rays which has the highest frequency.
Clouds are made of tiny droplets of liquid or frozen water. Clouds act like blankets which prevent heat energy stored in the air and soil from leaving the Earth in the form of infrared radiation.
The subatomic particle that does not have any electric charge is Neutron. It is neither positive nor negative.
Argon is a gas used to fill incandescent light bulbs.
Tear gas Known as La chrymator has chlorine gas one of its major component that cause severe eye, respiratory and skin irritation, pain, bleeding and even blindness.
Brine is a solution of excess salt and water. The high salt content in Brine prevents the growth of Bacteria and thus helps to preserve the food for a long time.
Automobile Battery primarily causes lead pollution which is harmful for environment.
Montreal protocol is an international treaty signed on 14 september 1987 to protect the ozone layer.
Super sonic jets cause thining of 03. layer which protects earth from harmful sun radiation.
Biogas is formed through Fermentation in which anaerobic digestion takes place inside a closed system.
Quenching is a process of cooling a material at a rapid rate. in ferrous alloys, this will often produce a harder metal, while non-ferrous alloys will usually become
Ethanol which is a viable bio-fiiel can be obtained from Sugarcane.
Distant objects can be seen with help of Telescope. It is an optical instrument that aids in the observation of remote objects by collecting electromagnetic radiation, (such as visible light).
Orientation/Steric factor. According to the collision model, a chemical reaction can occur only when the reactant molecules, atoms, or ions collide with more than a certain amount of kinetic energy and in the proper orientation.
Brown Ring test is used for the detection of ionic nitrates.
Calcium If normal amounts of calcium, platelets and tissue factors are present, Prothrombin is converted to Thrombin. Thrombin helps in blood coagulation or thrombus formation.
Analytical Engine was the world’s first general purpose computer which was used to perform analytical operations.
The cerebrum is the largest part of the human brain, making up about two – third of the brain’s mass.
Pancreas is a vital part of digestive system and a critical controller of Insulin.
Ascorbic Acid is not related to vitamin B complex group. Vitamin B complex group contains 8 water soluble. Vitamins-Vitamin B1, B2, B3, B6, B12, folate, biotin and pant othenic acid.
A virus is made up of a core of genet material either DNA or RNA, small which are made up of protein and nucleic Acid.
Sunflower is a Large plant and is not a shrub.
Biopsy, is a medical procedure during (SF) which a small sample of tissue is removed from a part of the body.
A Cryogenic rocket engine is a rocket engine that uses cryogenic fuel or oxidizer, its fuel are gases liquefied and stored at very low temperature
During photosynthesis light energy is connerted into chemical energy. The light energy is intercepted by chlorophyll, then some of the light energy is converted to chemical energy. During the process; a phosphate is added to a molecule to cause the formation of ATP.
Cohesive force between molecules is the reason of surface tension of liquid. Cohesine force is the action or property of like molecules sticking together.
Reduction is the process of adding oxygen to form an oxide. In this there is gain of electrons. ’
Solder is an alloy made up of Tin and lead. Solder is used to create a permanent bond between metal work pieces.
Carbon dioxide is a gas which leads to Global warming. Global warming is the rise in the average temperature of the Earth’s climate system.