NEET AIPMT Physics Chapter Wise Solutions – Properties of Matter
1. The cylindrical tube of a spray pump has radius R, one end of which has n fine holes, each of radius r. If the speed of the liquid in the tube is V, the speed of the ejection of the liquid throughthe holes is
2. Water rises to a height h in capillary tube. If the length of capillary tube above the surface of water is made less than h, then
(a) water rises upto a point a little below the top and stays there.
(b) water does not rise at all.
(c) water rises upto the tip of capillary tube and then starts overflowing like a fountain.
(d) water rises upto the top of capillary tube and stays there without overflowing. (AIPMT 2015)
3. The value of coefficient of volume expansion of glycerin is 5 x 10-4K-1. The fractional change in the density of glycerin for a rise of 40°C in its temperature, is
(d) 0.020 (AIPMT 2015)
4. The Young’s modulus of steel is twice that of brass. Two wires of same length and of same area of cross section, one of steel and another of brass are suspended from the same roof. If we want the lower ends of the wires to be at the same level, then the weights added to the steel and brass wires must be in the ratio of
(d) 2:1 (AIPMT 2015)
5. The two ends of a metal rod ate maintained at temperatures 100°C and 110°G. The rate of heat flow in the rod is found to be 4.0 J/s. If the ends are maintained at temperatures 200°C and 210°C, the rate of heat flow will be ,
(a) 8.0 J/s
(b) 4.0 J/s
(c) 44.0 J/s
(d) 16.8 J/s (AIPMT 2015, Cancelled)
6. A wind with speed 40 m/s blows parallel to the roof of a house. The area of the roof is 250 m2. Assuming that the pressure inside the house is atmospheric pressure, the force exerted by the wind on the roof and the direction of the force will be
7. On observing light from three different stars P, Q and R, it was found that intensity of violet colour is maximum in the spectrum of P, the intensity of green colour is maximum in the spectrum of R and the intensity of red colour is maximum in the spectrum of Q. If TP, TQand TR are the respective absolute temperatures of P, Q and R, then it can be concluded from the above observations that
8. The approximate depth of an ocean is 2700 m. The compressibility of water is 45.4 x 10-1 Pa-1 and density of water is 103 kg/m3. What fractional compression of water will be obtained at the bottom of the ocean?
9. Copper of fixed volume V is drawn into wire of length l. When this wire is subjected to a constant force F, the extension produced in the wire is Δl. Which of the following graphs is a straight line?
10. A certain number of spherical drops of a liquid of radius r coalesce to form a single drop of radius R and volume V. If T is the surface tension of the liquid, then
11. Steam at 100°C is passed into 20 g of water at 10°C. When water acquires a temperature of 80°C, the mass of water present will be [Take specific heat of water =1 cal g-1°C-1 latent heat of steam = 540 cal g-1]
(a) 24 g
(b) 31.5 g
(c) 42.5 g
(d) 22.5 g (AIPMT g014)
12. Certain quantity of water cools from 70°C to 60°C in the first 5 minutes and to 54°C in the next 5 minutes. The temperature of the surroundings is
13. A piece of iron is heated in a flame. It first becomes dull red then becomes reddish yellow and finally turns to white hot. The correct explanation for the If the ratio of diameters, lengths and Young’s modulus of steel and copper wires shown in the figure are p, q and s respectively, then the corresponding ratio of increase in their lengths
(a) Kirchhoff’s Law
(b) Newton’s Law of cooling
(c) Stefan’s Law
(d) Wien’s displacement Law (NEET 2013)
14. The wettability of a surface by a liquid depends primarily on
(b) angle of contact between the surface and the liquid
(d) surface tension (NEET 2013)
15. The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied?
(a) length = 200 cm, diameter = 2 mm
(b) length = 300 cm, diameter = 3 mm
(c) length = 50 cm, diameter = 0.5 mm
(d) length = 100 cm, diameter = 1 mm (NEET 2013)
16. The molar specific heats of an ideal gas at constant pressure and volume are denoted by Cp and Cv respectively, if γ= and R is the universal constant, then Cv=
17.If the ratio of diameters, lengths and Young’s modulus of steel and copper wires shown in the figure are p, q and s respectively, then the corresponding ratio of increase in their lengths would be
18. Two metal rods 1 and 2 of same’ lengths have same temperature difference between their ends. Their thermal conductivities are K1 and K2 and cross sectional areas A1 and A2, respectively. If the rate of heat conduction in 1 is four times that in 2, then
19. A fluid is in streamline flow across a horizontal pipe of variable area of cross section. For this which of the following statements is correct?
(a) The velocity is maximum at the narrowest part of the pipe and pressure is maximum at the widest part of the pipe.
(b) Velocity and pressure both are maximum at the narrowest part of the pipe.
(c) Velocity and pressure both are maximum at the widest part of the pipe.
(d) The velocity is minimum at the narrowest part of the pipe and the pressure is minimum at the widest part of the pipe. (Karnataka NEET 2013)
20. The density of water at 20°C is 998 kg/m3 and at 40°C 992 kg/m3. The coefficient of volume expansion of water is
21. If the radius of a star is R and it acts as a black body, what would be the temperature of the star, in which the rate of energy production is Q?
22. Liquid oxygen at 50 K is heated to 300 K at constant pressure of 1 atm. The rate of heating is constant. Which one of the following graphs represents the variation of temperature with time?
23. A slab of stone of area 0.36 m2 and thickne 1 m is exposed on the lower surface to steam at 100°C. A block of ice at 0°C rests on the upper surface of the slab. In one hour 4.8 kg of ice is melted. The thermal conductivity of slab is (Given latent heat of fusion of ice = 3.36 x 10s J kg-1)
24. A cylindrical metallic rod in thermal contact with two reservoirs of heat at its two ends conducts an amount of heat Q in time t. The metallic rod is melted and the material is formed into a rod of half the radius of the original rod. What is the amount of heat conducted by the new rod, when placed in thermal contact with the two reservoirs in time t?
25. The total radiant energy per unit area, normal to the direction of incidence, received at a distance R from the centre of a star of radius r, whose outer surface radiates as a black body at a temperature T K is given by
26. Assuming the sun to have a spherical outer surface of radius r, radiating like a black body at temperature t°C, the power received by a unit surface, (normal to the incident rays) at a distance R from the centre of the sun is
27. A black body at 227°C radiates heat at the rate of 7 cals/cm2s. At a temperature of 727°C, the rate of heat radiated in the same units will be
(d) 60 (Prelims 2009)
28. The two ends of a rod of length L and a uniform cross-sectional area A are kept at two temperatures T1 and T2(T1 > T2). The rate of heat transfer , through the rod in a steady state is dQ/dT , dt given by
29. On a new scale of temperature (which is linear) and called the W scale, the freezing and boiling points of water are 39°W and 239° W respectively. What will be the temperature on the new scale, corresponding to a temperature of 39°C on the Celsius scale ? .
(a) 200° W
(d) 117°W (Prelims 2008)
30. A black body is at 727°C. It emits energy at a rate which is proportional to
(d) (727)2. (2007)
31. A black body at 1227°C emits radiations with maximum intensity at a wavelength of 5000 Å. If the temperature of the body is increased by 1000°C, the maximum intensity will be observed at
32. Which of the following rods, (given radius r and length l) each made of the same material and whose ends are maintained at the same temperature will conduct most heat?
33. If lm denotes the wavelength at which the radiative emission from a black body at a temperature 7K is maximum, then
34. Consider a compound slab consisting of two different materials having equal thicknesses and thermal conductivities K and 2 K, respectively. The equivalent thermal conductivity of the slab is
35. Unit of Stefan’s constant is
(a) watt m2 K4
(b) watt m2/K4
(d) watt/m2K4. (2002)
36. Consider two rods of same length and different specific heats (S1, S2), conductivities (K1 K2) and area of cross-sections (A1 A2) and both having temperatures T1 and T2 at their ends. If rate of loss of heat due to conduction is equal, then
37. For a black body at temperature 727°C, its radiating power is 60 watt and temperature of surrounding is 227°C. If temperature of black body is changed to 1227°C then its radiating power will be
(a) 304 W
(b) 320 W
(c) 240 W
(d) 120 W. (2002)
38. Which of the following is best close to an ideal black body?
(a) black lamp
(b) cavity maintained at constant temperature
(c) platinum black
(d) a lump of charcoal heated to high temperature. (2002)
39. The Wien’s displacement law express relation between
(a) wavelength corresponding to maximum energy and temperature
(b) radiation energy and wavelength
(c) temperature and wavelength
(d) colour of light and temperature. (2002)
40. A cylindrical rod having temperature T1 and T2at its aid. The rate of flow of heat Q1 cal/sec. If all the linear dimension are doubled keeping temperature constant, then rate of flow of heat Q2 will be
41. A black body has maximum wavelength 1 m at 2000 K. Its corresponding wavelength at 3000 K will be
42. A black body is at a temperature of500 K. It emits energy at a rate which is proportional to
(d) (500) . (1997)
43. A beaker full of hot water is kept in a room. If it cools from 80°C to 75°C in t1 minutes, from 75°C to 70°C in t2 minutes and from 70°C to 65°C in t3 minutes, then
44. Heat is flowing through two cylindrical rods of the same material. The diameters of the rods are in the ratio 1:2 and the lengths in the ratio 2 :1. If the temperature difference between the ends is same, then ratio of the rate of flow of heat through them will be
(a) 2 : 1
(b) 8 : 1
(d) 1 :8. (1995)
45. If the temperature of the sun is doubled, the rate of energy recieved on earth will be increased by a factor of
(d) 16 (1993)
46. Mercury thermometer can be used to measure temperature upto
(d) 500°C (1992)
47. A Centigrade and a Fahrenheit thermometer are dipped in boiling water. The water temperature is lowered until the Fahrenheit thermometer registers 140°F. What is the fall in temperature as registered by the centigrade thermometer ?
(d) 30°C (1990)