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Class 11 Physics Objective Chapter – 11 Thermal Properties of Matter
1. Absorptive power of perfectly black body is
( a ) Zero
( b ) Infinity
( c ) One
( d ) Constant
Ans:- ( c)
2. A liquid with coefficient of cubical expansion γ is contained in a vessel having coefficient of linear expansion γ ⁄ 7. When heated, what will happen to the level of the liquid in the vessel?
( a ) It falls
( b ) It rises
( c ) Remains unchanged
( d ) It may rise or fall depending upon the nature of the container
Ans:- ( c)
3. The form of energy transferred between two systems or a system and its surrounding by virtue of temperature difference is called as
( a ) Heat
( b ) Temperature
( c ) Both a and b
( d ) None
Ans:- ( a)
4. S.I. unit of heat is
( a ) Joule
( b ) Calorie
( c ) Kilo calorie
( d ) None of the above
Ans:- ( a)
5.The reading of Centigrade thermometer coincides with that of Fahrenheit thermometer in a liquid. The temperature of the liquid is
( a ) 40°C
( b ) 100°C
( c ) 313°C
( d ) 0ºC
Ans:- ( a)
6.In order that the heat flows from one part of a solid to another part, what is required?
( a ) Uniform density
( b ) Temperature gradient
( c ) Density gradient
( d ) Uniform temperature
Ans:- ( b)
7. Which of the following will expand the most for same rise in temperature?
( a ) Aluminium
( b ) Wood
( c ) Glass
( d ) All will expand same
Ans:- ( a)
8. Two stars A and B radiate maximum energy at 3600°A and 4800°A respectively. Then the ratio of absolute temperatures of A and B is
( a ) 256 : 81
( b ) 81 : 256
( c ) 3 : 4
( d ) 4 : 3
Ans:- ( d)
9.A black body at hot temperature at 227°C radiates heat at a rate of 5 cal/cm²s. at a temperature of 727°C the rate of heat radiated per unit area will be
( a ) 50 cal/cm²s
( b ) 250 cal/cm²s
( c ) 80 cal/cm²s
( d ) 100 cal/cm²s
Ans:- ( c)
10. The temperature determines the direction of net change of:
( a ) gross potential energy
( b ) intermolecuiar potential energy
( c ) gross kinetic energy
( d ) intermolecuiar kinetic energy
Ans:- ( d)
11. The SI unit of heat energy is
( a ) J
( b ) N
( c ) Pa
( d ) N/m2
Ans:- ( a)
12. Which of the following will radiate heat to large extent?
( a ) Rough surface
( b ) Polished surface
( c ) Black rough surface
( d ) Black polished surface
Ans:- ( c)
13. Expansion during heating
( a ) generally decreases the density of a material
( b ) None of these
( c ) increases the weight of a material
( d ) occurs only in solids
Ans:- ( a)
14.The sprinkling of water slightly reduces the temperature of a closed room because
( a ) temperature of water is less than that of the room
( b ) specific heat of water is high
( c ) water has large latent heat of vaporisation
( d ) water is a bad conductor of heat
Ans:- ( c)
15. An iron tyre is to be fitted on to a wooden wheel 1m in diameter. The diameter of tyre is 6 mm smaller than that of wheel. The tyre should be heated so that its temperature increases by a minimum of ( the coefficient of cubical expansion of iron is 3.6 × 10-5/°C )
( a ) 500°C
( b ) 334°C
( c ) 1000°C
( d ) 167°C
Ans:- ( a)
16. Two spheres made of same material have radii in the ratio 2 : 1. if both the spheres are at same temperature, then what is the ratio of heat radiation energy emitted per second by them?
( a ) 1 : 4
( b ) 4 : 1
( c ) 3 : 4
( d ) 4 : 3
Ans:- ( b)
17. A body cools from 50°C to 46°C in 5 minutes and to 40°C in the next 10 minutes. The surrounding temperature is
( a ) 30°C
( b ) 28°C
( c ) 36°C
( d ) 32°C
Ans:- ( a)
18. Thermal equilibrium implies equality of:
( a ) energy
( b ) internal energy
( c ) K.E.
( d ) temperature
Ans:- ( d)
19. The SI unit of temperature is
( a ) Kelvin
( b ) Degree Celsius
( c ) Degree Fahrenheit
( d ) All
Ans:- ( a)
20. Co-efficient of reflection, coefficient of absorption and coefficient transmission are related as
( a ) a + r + 1 = 1
( b ) a + r + t1 1
( c ) a + r = -t
( d ) a1 r + 1
Ans:- ( a)
21. Which of the following will expand the most for same rise in temperature?
( a ) Aluminium
( b ) Wood
( c ) Glass
( d ) All will expand same
Ans:- ( a)
22. Which of the following is not close to a black body?
( a ) Black board paint
( b ) Green leaves
( c ) Black holes
( d ) Red roses
Ans:- ( a)
23. The triple point of a substance is unique i.e. it occurs at one particular set of values of pressure and temperature
( a ) Assertion is correct, reason is correct; reason is a correct explanation for assertion
( b ) Assertion is incorrect, reason is correct
( c ) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
( d ) None of these
Ans:- ( a)
24. The earth intercepts approximately one billionth of the power radiated by the sun. if the surface temperature of the sun were to drop by a factor of 2, the average radiant energy incident on earth per second would reduce by factor of
( a ) 2
( b ) 4
( c ) 8
( d ) 16
Ans:- ( d)
25.For which of the following process, the thermal conduction is maximum?
( a ) Combustion
( b ) Radiation
( c ) Convection
( d ) Conduction
Ans:- ( b)
26. Two bars of copper having same length but an equal diameter are heated to the same temperature. The change in length will be:
( a ) more in thicker bar
( b ) more in thinner bar
( c ) same for both
( d ) determined by the ratio of length and diameter of the bars
Ans:- ( c)
27. The commonly used unit of temperature is
( a ) Kelvin
( b ) Degree Fahrenheit
( c ) Degree Celsius
( d ) All
Ans:- ( c)
28. The good absorber of heat are
( a ) Non-emitter
( b ) Poor-emitter
( c ) Good-emitter
( d ) Highly polished
Ans:- ( c)
29.A metal sheet with a circular hole is heated. The hole
( a ) gets larger
( b ) gets deformed
( c ) gets smaller
( d ) None of these
Ans:- ( a)
30.According to Newton’s law of cooling, the rate of cooling of a body is proportional to ( Dq)n, where Dq is the difference of the temperature of the body and the surroundings, and n is equal to
( a ) two
( b ) three
( c ) four
( d ) one
Ans:- ( d)
31. A metal sheet with a circular hole is heated. The hole
( a ) gets larger
( b ) gets deformed
( c ) gets smaller
( d ) None of these
Ans:- ( a)
32. A bucket full of hot water is kept in a room and it cools from 75°C to 70°C in t1 minutes from 70°C to 65°C in t2 minutes and from 65°C to 60°C in t3 minutes; then
( a ) t1 – t2 = t3
( b ) t1 < t2 < t3
( c ) t1 > t2 > t3
( d ) t1 < t2 > t3
Ans:- ( b)
33. Two stars A and B radiate maximum energy at 3600°A and 4800°A respectively. Then the ratio of absolute temperatures of A and B is
( a ) 256 : 81
( b ) 81 : 256
( c ) 3 : 4
( d ) 4 : 3
Ans:- ( d)
34.A metallic ball has a spherical cavity at its centre. If the ball is heated, what happens to the cavity?
( a ) Its volume decreases
( b ) Its volume increases
( c ) Its volume remains unchanged
( d ) Its volume may increase or decrease depending upon the nature of the metal
Ans:- ( b)
35.Charle’s law is given by
( a ) V = constant
( b ) V/T = constant
( c ) T = constant
( d ) None
Ans:- ( b)
36.Expansion during heating
( a ) generally decreases the density of a material
( b ) None of these
( c ) increases the weight of a material
( d ) occurs only in solids
Ans:- ( a)
37.A solid ball of metal has a spherical cavity inside it. The balln is heated. The volume of cavity will
( a ) increase
( b ) decrease
( c ) remain unchanged
( d ) have its shape changed
Ans:- ( a)
38. metallic rod l cm long, A square cm in cross-section is heated through tºC. If Young’s modulus of elasticity of the metal is E and the mean coefficient of linear expansion is a per degree celsius, then the compressional force required to prevent the rod from expandin
( a ) E A ∝ t
( b ) E A ∝ t/( 1 + at)
( c ) E A ∝ t/( 1 – ∝ t)
( d ) E l ∝ t
Ans:- ( a)
39. A solid ball of metal has a spherical cavity inside it. The balln is heated. The volume of cavity will
( a ) increase
( b ) decrease
( c ) remain unchanged
( d ) have its shape changed
Ans:- ( a)
40. A sphere, a cube and a thin circular plate, all made of the same material and having the same mass are initially heated to a temperature of 3000°K, which of these will cool fastest?
( a ) Sphere
( b ) Cube
( c ) Plate
( d ) None
Ans:- ( c)
41. Unit of Stefans constant is given by
( a ) W/ m K²
( b ) W/ m² K²
( c ) W²/ m² K4
( d ) W/ mK
Ans:- ( b)
42. Gas thermometers are more sensitive than liquid thermometers as the gases
( a ) have low specific heat
( b ) have high specific heat
( c ) have large coefficient of expansion
( d ) are lighter
Ans:- ( c)
43. The absolute zero temperature is given by
( a ) +273.15°C
( b ) -273.15°C
( c ) 0°C
( d ) 1°C
Ans:- ( b)
44. A circular disc is heated. Its M.I. about an axis passing through its centre and perpendicular to its plane
( a ) increases
( b ) decreases
( c ) remains same
( d ) first increases and then decreases
Ans:- ( a)
45. Water kept in an open vessel will quickly evaporate onthe surface of the moon.
Reason : The temperature at the surface of the moon is much higher than boiling point of the water.
( a ) Assertion is correct, reason is incorrect
( b ) None of these
( c ) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
( d ) Assertion is correct, reason is correct; reason is a correct explanation for assertion
Ans:- ( a)
46. A black body rediates energy at the rate of E watt per metre2 at a high temperature T K. when the temperature is reduced to ( T/2 ) K, the radiant energy will be
( a ) E/16
( b ) E/4
( c ) E/2
( d ) 2E
Ans:- ( a)
47. The process of heat transfer in which heat is transferred with actual migration of medium particles is known as ( AFMC- 94)
( a ) Conduction
( b ) Convection
( c ) Radiation
( d ) Reflection
Ans:- ( b)
48. Which of the following statement is wrong?
( a ) Rough surfaces are better radiators tan smooth surfaces
( b ) Highly polished mirror surfaces are very good radiators
( c ) Black surfaces are better absorbers then white ones
( d ) Black surfaces are better radiators then white ones
Ans:- ( b)
49. A metal piece heated to T1°K. The temperature of the surrounding is T2°K. the heat in the surrounding due to radiation is proportional to
( a ) ( T14 – T24)
( b ) ( T1 – T2)4
( c ) ( T14 + T24)
( d ) ( T13 – T23)
Ans:- ( a)
50. An iron ball is heated. The percentage increase will be largest in
( a ) density
( b ) surface area
( c ) diameter
( d ) volume
Ans:- ( d)
51.The increase in dimensions of body due to the increase in temperature of the body is called as
( a ) Thermal expansion
( b ) Linear expansion
( c ) Area expansion
( d ) Volume expansion
Ans:- ( a)
52. In which process the rate of transfer of heat is maximum?
( a ) Conduction
( b ) Convection
( c ) Radiation
( d ) In all these heat is transferred with the same velocity
Ans:- ( c)
53. Two marks on a glass rod 10 cm apart are found to increase their distance by 0.08 mm when the rod is heated from 0°C to 100°C. A flask made of the same glass as that of rod measures a volume of 1000 cc at 0°C. The volume it measures at 100°C in cc is
( a ) 1002.4
( b ) 1008.2
( c ) 1004.2
( d ) 1006.4
Ans:- ( a)