Explore topic-wise MCQs in Physics.

This section includes 5 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.

1.

20J of heat energy is extracted from a cold reservoir when 30J of work is done on a refrigerator. What is the coefficient of the refrigerator?

A. 2/3
B. 5/3
C. 3/5
D. 1/3
Answer» B. 5/3
Discussion
2.

The coefficient of a refrigerator can be greater than 1. True or False?

A. True
B. False
Answer» B. False
Discussion
3.

Efficiency of a refrigerator can be greater than 1. True or False?

A. True
B. False
Answer» C.
Discussion
4.

Select the correct order of steps in which a working substance(gas) goes through in a refrigerator.

A. Expansion of gas, absorption of heat, heating of vapour, release of heat
B. Absorption of heat, expansion of gas, heating of vapour, release of heat
C. Heating of vapour, expansion of gas, absorption of heat, release of heat
D. Heating of vapour, absorption of heat, expansion of gas, release of heat
Answer» B. Absorption of heat, expansion of gas, heating of vapour, release of heat
Discussion
5.

What is the coefficient of performance of a refrigerator? Let Q1 be the heat released to hot reservoir, Q2 be the heat extracted from a cold reservoir & W be the work done on the refrigerator.

A. Q1/W
B. Q1/Q2
C. Q2/W
D. Q2/Q1
Answer» D. Q2/Q1
Discussion