# MCQ Questions for Class 11 Physics Chapter 11 Thermal Properties of Matter with Answers

Students are advised to practice the NCERT MCQ Questions for Class 11 Physics Chapter 11 Thermal Properties of Matter with Answers Pdf free download is available here. MCQ Questions for Class 11 Physics with Answers are prepared as per the Latest Exam Pattern. Students can solve these Thermal Properties of Matter Class 11 MCQs Questions with Answers and assess their preparation level.

## Thermal Properties of Matter Class 11 MCQs Questions with Answers

Solving the Thermal Properties of Matter Multiple Choice Questions of Class 11 Physics Chapter 11 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Thermal Properties of Matter Class 11 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 11 Physics Class 11 and cross-check your answers during preparation.

Question 1.
Two stars A and B radiate maximum energy at 3600°A and 3600°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

Question 2.
Which of the following will radiate heat to large extent?
(a) Rough surface
(b) Polished surface
(c) Black rough surface
(d) Black polished surface

Question 3.
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

Question 4.
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

Question 5.
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

Answer: (b) t1 < t2 < t3

Question 6.
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

Question 7.
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: (d) T² = 2 T1

Question 8.
Unit of Stefans constant is given by
(a) W/ m K²
(b) W/ m² K²
(c) W²/ m² K4
(d) W/ mK

Question 9.
The good absorber of heat are
(a) Non-emitter
(b) Poor-emitter
(c) Good-emitter
(d) Highly polished

Question 10.
A black body is at a temperature of 500K. it emits energy at a rate which is proportional to
(a) 500
(b) (500)2
(c) (500)3
(d) (500)4

Question 11.
The coefficient of transmission of a perfectly black body is
(a) Zero
(b) One
(c) 0.5
(d) 0.75

Question 12.
Newtons law of cooling is also applicable to
(a) Convection losses
(b) Natural convection losses
(c) Forced convection losses
(d) None of the above

Question 13.
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 300°C. which one of these cools faster?
(a) Circular plate
(b) Sphere
(c) Cube
(d) All will cool at the same rate

Question 14.
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

Question 15.
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

Question 16.
In which process the rate of transfer of heat is maximum?
(a) Conduction
(b) Convection
(d) In all these heat is transferred with the same velocity

Question 17.
Which of the following will radiate heat to large extent?
(a) Rough surface
(b) Polished surface
(c) Black rough surface
(d) Black polished surface

Question 18.
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

Question 19.
A surface at temperature T0°K receives power P by radiation from a small sphere at temperature T >> T0 and at a distance d. if both T and d are doubled, the power received by surface will becomes approximately
(a) P
(b) 2p
(c) 4p
(d) 16p

Question 20.
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