# Unseen Passage

For Class 4 to Class 12

# Thermal Properties of Matter MCQ Class 11 Physics

Please refer to Chapter 11 Thermal Properties of Matter MCQ Class 11 Physics with answers below. These multiple-choice questions have been prepared based on the latest NCERT book for Class 11 Physics. Students should refer to MCQ Questions for Class 11 Physics with Answers to score more marks in Grade 11 Physics exams. Students should read the chapter Thermal Properties of Matter and then attempt the following objective questions.

## MCQ Questions Class 11 Physics Chapter 11 Thermal Properties of Matter

The Thermal Properties of Matter MCQ Class 11 Physics provided below covers all important topics given in this chapter. These MCQs will help you to properly prepare for exams.

Question. 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

D

Question. 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

D

Question. 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

D

Question. 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

C

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

C

Question. 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

B

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

A

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

B

Question. 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

A

Question. 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

B

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

C

Question. 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

C

Question. 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

C

Question. 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

D

Question. 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

B

Question. 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

C

Question. 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
(d) Reflection

B

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