NCERT Solutions for class 11 Physics | Chapter 11 - Thermal Properties of Matter

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Questions
1 Newton’s law of cooling is applicable for
A small excess of temperature over the surrounding
B large excess of temperature over the surrounding
C None of these
D any excess of temperature over the surrounding

Answer:small excess of temperature over the surrounding
2 4200 J of work is required for
A increasing the temperature of 100 g of water through 10°C
B increasing the temperature of 1 kg of water through 10°C
C increasing the temperature of 500 g of water through 10°C
D increasing the temperature of 10 g of water through 10°C

Answer:increasing the temperature of 100 g of water through 10°C
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3 Good absorbers of heat are
A good emitters
B non-emitters
C poor emitters
D highly polished

Answer:good emitters
4 Sweet makers do not clean the bottom of cauldron because
A black and rough surface absorbs more heat
B absorption power of black and bright surface is more.
C transmission power of black and rough surface is more.
D emission power of black and bright surface is more

Answer:black and rough surface absorbs more heat
5 Which of the following statements regarding specific heat capacity of a substance are correct ? It depends on

I. mass of substance.

II. nature of substance.

III. temperature of substance.

IV. volume of substance.

A II and III
B None of these
C I and II
D III and IV

Answer:II and III
6 A uniform metallic rod rotates about its perpendicular bisector with constant angular speed. If it is heated uniformly to raise its temperature slightly
A its speed of rotation increases.
B its speed of rotation decreases.
C its speed of rotation remains same.
D its speed increases because its moment of inertia increases.

Answer:its speed of rotation decreases.
7 An aluminium sphere is dipped into water. Which of the following is true?
A Buoyancy will be less in water at 0°C than that in water at 4°C.
B Buoyancy will be more in water at 0°C than that in water at 4°C.
C Buoyancy in water at 0°C will be same as that in water at 4°C.
D Buoyancy may be more or less in water at 4°C depending on the radius of the sphere.

Answer:Buoyancy will be less in water at 0°C than that in water at 4°C.
8 A perfectly black body emits radiation at temperature T1 K. if it sis to radiate 16 times this power, its temperature T2. will be
A T2 = 16 T1
B T2 = 8 T1
C T1 = 4 T1
D T2 = 2 T1

Answer:T2 = 2 T1
9 A black body is at 300 K. it emits energy at a rate which is proportional to
A (300)
B (300)2
C (300)4
D (300)3

Answer:(300)4
10 The rate of radiation of black body at 0°C is E watt. The n the rate of radiation of this black body at 273°C will be
A 16 E
B 8 E
C 4 E
D E

Answer:16 E
11 An object is at the temperature of 400°C. at what temperature would it radiant energy twice as first? The temperature of surrounding may be assumed to be negligible
A 200°C
B 200°K
C 800°C
D 800°K

Answer:800°K
12 Spectrum of a perfectly black body is
A Line spectrum
B Band spectrum
C Continuous spectrum
D None of these

Answer:Continuous spectrum
13 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

Answer:Radiation
14 A body cools from 60°C to 50°C in 10 minutes. If the room temperature is 25°C and assuming Newtonos law of cooling to hold good, the temperature of the body at the end of the next 10 minutes will be
A 38.5°C
B 40°C
C 42.85°C
D 45°C

Answer:42.85°C
15 The temperature of a piece of metal is raised from 27°C to 51.2°C. the rate at which metal radiates energy increases nearly
A 1.36 times
B 2.36 times
C 3.36 times
D 4.36 times

Answer:1.36 times
16 Three black bodies A, B and C in the form of cubes of sides in the ratio of 3: 4: 5 are kept at the same high temperature. The ratio of the quantity of heat lost per second by A, B and C will be
A 27: 64: 125
B 5:4:3
C 09:16:25
D 25:16:9

Answer:09:16:25
17 Two sphere of the same material have radii 1 m and 4 m and temperature 4000 K and 2000 K respectively. the energy radiated per second by the first sphere is
A Greater then by the second
B Less than that by the second
C Equal in both cases
D The information is incomplete to draw and conclusion

Answer:Equal in both cases
18 If a = 0.72, r = 0.24, then the value of t is
A 0.02
B 0.04
C 0.4
D 0.2

Answer:0.04
19 A cup of tea cools from 80°C to 60°C in one minute. The ambient temperature is 30°C. in cooling from 60°C to 50°C, it will take.
A 50 sec
B 90 sec
C 60 sec
D 30 sec

Answer:50 sec
20 If the temperature of the sun is doubled. The rate of energy received on the earth will be increased by a factor of
A 2
B 4
C 8
D 16

Answer:16

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