Thermodynamics MCQs with Conceptual Explanations
Thermodynamics MCQs with Conceptual Explanations
Class: CBSE Class 11
Subject: Physics
Section: Thermodynamics
Topic: Thermodynamics MCQs with Conceptual Explanations
Board: CBSE Board Examination (Strictly NCERT Based)
Subject: Physics
Section: Thermodynamics
Topic: Thermodynamics MCQs with Conceptual Explanations
Board: CBSE Board Examination (Strictly NCERT Based)
Q1. First law of thermodynamics is based on:
Answer: B
Explanation: It states energy can neither be created nor destroyed, only transformed.
Explanation: It states energy can neither be created nor destroyed, only transformed.
Q2. Mathematical form of first law:
Answer: B
Explanation: Heat supplied = Increase in internal energy + Work done.
Explanation: Heat supplied = Increase in internal energy + Work done.
Q3. Internal energy depends on:
Answer: A
Explanation: For ideal gas, internal energy depends only on temperature.
Explanation: For ideal gas, internal energy depends only on temperature.
Q4. Work done in isochoric process:
Answer: B
Explanation: Volume constant → W = PΔV = 0.
Explanation: Volume constant → W = PΔV = 0.
Q5. Isothermal process temperature:
Answer: C
Explanation: Temperature remains constant.
Explanation: Temperature remains constant.
Q6. Adiabatic process heat exchange:
Answer: Zero.
Q7. Cp > Cv because:
Answer: Work done at constant pressure.
Q8. Unit of entropy:
Answer: J/K.
Q9. Second law deals with:
Answer: Entropy.
Q10. Heat engine converts:
Answer: Heat → Work.
Q11. Efficiency formula:
Answer: W/Qh.
Q12. Carnot engine efficiency depends on:
Answer: Reservoir temperatures.
Q13. Refrigerator removes heat from:
Answer: Cold body.
Q14. Internal energy change in cyclic process:
Answer: Zero.
Q15. PV diagram area gives:
Answer: Work done.
Q16. Isochoric graph in PV:
Answer: Vertical line.
Q17. Isobaric graph in PV:
Answer: Horizontal line.
Q18. Adiabatic curve steeper because:
Answer: No heat exchange.
Q19. γ = Cp/Cv called:
Answer: Adiabatic index.
Q20. Entropy increases in:
Answer: Irreversible processes.
Q21. Heat cannot flow from:
Answer: Cold to hot spontaneously.
Q22. Absolute zero entropy:
Answer: Minimum.
Q23. Thermodynamic system exchanges:
Answer: Energy.
Q24. Closed system exchanges:
Answer: Energy not matter.
Q25. Open system exchanges:
Answer: Matter & energy.
Q26. Zeroth law defines:
Answer: Temperature equilibrium.
Q27. Heat capacity unit:
Answer: J/K.
Q28. Maximum engine efficiency:
Answer: Carnot engine.
Q29. Work done positive when:
Answer: Gas expands.
Q30. Work done negative when:
Answer: Gas compressed.
