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Free download in PDF Class 11 Physics Chapter 11 Thermal Properties of Matter Multiple Choice Questions and Answers for Board, JEE, NEET, AIIMS, JIPMER, IIT-JEE, AIEE and other competitive exams. MCQ Questions for Class 11 Physics with Answers were prepared based on the latest exam pattern. These short solved questions or quizzes are provided by Gkseries. These will help the students for preparation of their examination./p>
(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
(3)
Good absorbers of heat are
[A]
good emitters
[B]
non-emitters
[C]
poor emitters
[D]
highly polished
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(20)
If the temperature of the sun is doubled. The rate of energy received on the earth will be increased by a factor of
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