Heat Engines and Carnot Cycle MCQs
Heat Engines and Carnot Cycle MCQs
Class: CBSE Class 11
Subject: Physics
Section: Thermodynamics
Topic: Heat Engines and Carnot Cycle MCQs
Board: CBSE Board Examination (Strictly NCERT Based)
Subject: Physics
Section: Thermodynamics
Topic: Heat Engines and Carnot Cycle MCQs
Board: CBSE Board Examination (Strictly NCERT Based)
Q1. A heat engine converts:
Answer: B
Explanation: A heat engine converts thermal energy into mechanical work.
Explanation: A heat engine converts thermal energy into mechanical work.
Q2. A heat engine operates between:
Answer: B
Explanation: It works between a hot and a cold reservoir.
Explanation: It works between a hot and a cold reservoir.
Q3. Efficiency of a heat engine is:
Answer: C
Explanation: Efficiency = Work output / Heat absorbed from hot reservoir.
Explanation: Efficiency = Work output / Heat absorbed from hot reservoir.
Q4. Carnot engine is:
Answer: B
Explanation: Carnot engine is an ideal engine with maximum possible efficiency.
Explanation: Carnot engine is an ideal engine with maximum possible efficiency.
Q5. Carnot cycle consists of:
Answer: A
Explanation: Carnot cycle has two isothermal and two adiabatic processes.
Explanation: Carnot cycle has two isothermal and two adiabatic processes.
Q6. Carnot engine efficiency depends on:
Answer: Temperatures of reservoirs.
Q7. Carnot efficiency formula:
Answer: η = 1 − T₂/T₁.
Q8. T₁ represents:
Answer: Hot reservoir temperature.
Q9. T₂ represents:
Answer: Cold reservoir temperature.
Q10. Efficiency is maximum when:
Answer: Temperature difference is maximum.
Q11. Efficiency can never be:
Answer: 100%.
Q12. Heat rejected to sink is:
Answer: Qc.
Q13. Heat absorbed from source is:
Answer: Qh.
Q14. Carnot cycle is plotted on:
Answer: PV diagram.
Q15. Carnot engine violates:
Answer: None of the laws.
Q16. Work done in one cycle equals:
Answer: Area enclosed by cycle.
Q17. Real engines are less efficient because:
Answer: Irreversibility and friction.
Q18. Carnot engine is reversible because:
Answer: No entropy generation.
Q19. Refrigerator is reverse of:
Answer: Heat engine.
Q20. COP of refrigerator relates to:
Answer: Cooling effect.
Q21. COP is always:
Answer: Greater than 1.
Q22. Carnot refrigerator efficiency depends on:
Answer: Reservoir temperatures.
Q23. Work done in isothermal expansion is:
Answer: Equal to heat absorbed.
Q24. Adiabatic expansion causes:
Answer: Temperature decrease.
Q25. Carnot cycle entropy change of universe:
Answer: Zero.
Q26. Heat engine requires cyclic process because:
Answer: System returns to initial state.
Q27. Higher hot reservoir temperature leads to:
Answer: Higher efficiency.
Q28. Lower sink temperature leads to:
Answer: Higher efficiency.
Q29. No engine can be more efficient than:
Answer: Carnot engine.
Q30. Carnot engine proves:
Answer: Second law of thermodynamics.