Laws of Thermodynamics MCQs – Class 11
Laws of Thermodynamics MCQs – Class 11 Physics
Class: CBSE Class 11
Subject: Physics
Section: Thermodynamics
Topic: Laws of Thermodynamics MCQs
Board: CBSE Board Examination (Strictly NCERT Based)
Subject: Physics
Section: Thermodynamics
Topic: Laws of Thermodynamics MCQs
Board: CBSE Board Examination (Strictly NCERT Based)
Q1. Zeroth law of thermodynamics defines:
Answer: C
Explanation: It establishes thermal equilibrium and defines temperature.
Explanation: It establishes thermal equilibrium and defines temperature.
Q2. First law is based on conservation of:
Answer: Energy
Explanation: Energy cannot be created or destroyed.
Explanation: Energy cannot be created or destroyed.
Q3. Mathematical form:
Answer: B
Explanation: Heat supplied increases internal energy and does work.
Explanation: Heat supplied increases internal energy and does work.
Q4. Second law introduces concept of:
Answer: Entropy
Explanation: Entropy measures disorder.
Explanation: Entropy measures disorder.
Q5. Heat flows naturally from:
Answer: Hot → Cold
Explanation: As per second law.
Explanation: As per second law.
Q6. Entropy unit:
Answer: J/K.
Q7. Internal energy depends on:
Answer: Temperature.
Q8. Isochoric work:
Answer: Zero.
Q9. Adiabatic heat exchange:
Answer: Zero.
Q10. Cp > Cv because:
Answer: Work done at constant pressure.
Q11. Heat engine converts:
Answer: Heat → Work.
Q12. Refrigerator removes heat from:
Answer: Cold body.
Q13. Carnot engine efficiency:
Answer: Maximum possible.
Q14. PV diagram area:
Answer: Work done.
Q15. Cyclic process ΔU:
Answer: Zero.
Q16. Entropy increases in:
Answer: Irreversible process.
Q17. Kelvin scale zero:
Answer: Absolute zero.
Q18. Heat is path function?
Answer: Yes.
Q19. Internal energy is:
Answer: State function.
Q20. Work sign positive when:
Answer: Gas expands.
Q21. Work negative when:
Answer: Gas compressed.
Q22. Zeroth law deals with:
Answer: Thermal equilibrium.
Q23. Heat capacity unit:
Answer: J/K.
Q24. Entropy symbol:
Answer: S.
Q25. Clausius statement relates to:
Answer: Second law.
Q26. Kelvin statement relates to:
Answer: Second law.
Q27. Efficiency never equals:
Answer: 100%.
Q28. Reversible process entropy change:
Answer: Zero (universe).
Q29. Heat engine requires:
Answer: Two reservoirs.
Q30. Third law states entropy at 0 K:
Answer: Minimum/zero.
