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Class 11 Physics Practice Test: Thermodynamics - Refrigerators and Heat Pumps
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Avg score: 64% • Most missed: “Efficiency of a refrigerator can be greater than 1. True or False?”

Both refrigerator or a heat pump are engines running in reverse. For a refrigerator, the focus is on removing heat from a specific area. For a heat pump, the focus is on dumping heat to a specific area.

Class 11 Physics Practice Test: Thermodynamics - Refrigerators and Heat Pumps
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5 Questions

1. Efficiency of a refrigerator can be greater than 1. True or False?
2. 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?
3. 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.
4. The coefficient of a refrigerator can be greater than 1. True or False?
5. Select the correct order of steps in which a working substance(gas) goes through in a refrigerator.

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