Class 11 Physics · Chapter 6 · Test 3
Heat Engines and Entropy
44 MCQs This test covers heat engines, the second law and Kelvin’s statement, the Carnot cycle, Carnot’s theorem and engine efficiency with numericals. It also covers the refrigerator and its coefficient of performance, and entropy as a measure of disorder with the entropy statement of the second law.
49 questions · 35 min · 49 marks
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Sample questions
The first 5 of 49. Try each one, then tap to see the answer.
Question 1
A device that converts thermal energy into mechanical energy is called a:
- ARefrigerator
- BThermocouple
- CHeat engine
- DBarometer
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Answer: C
A heat engine converts some thermal energy into work.
Question 2
The earliest heat engine developed was the:
- ASteam engine
- BPetrol engine
- CDiesel engine
- DCarnot engine
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Answer: A
The steam engine was the earliest heat engine.
Question 3
The working principle of a heat engine is the:
- AConversion of work into heat in a single step
- BConversion of mass into energy
- CStorage of heat in a reservoir
- DConversion of heat energy into work through a cyclic process
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Answer: D
A heat engine works by cyclically converting heat energy into mechanical work.
Question 4
A heat engine absorbs heat Q_H from a:
- ALow temperature reservoir
- BHigh temperature reservoir
- CVacuum
- DRefrigerator
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Answer: B
The engine absorbs heat from the hot reservoir performs work and rejects the rest to the cold reservoir.
Question 5
The work done by a heat engine in one cycle is:
- AW = Q_H - Q_C
- BW = Q_H + Q_C
- CW = Q_C - Q_H
- DW = Q_H x Q_C
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Answer: A
Since ΔU = 0 over a cycle the work equals the heat absorbed minus the heat rejected.
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