🔥 Thermodynamics – Objective Questions

Set 3 : Advanced Numerical & Conceptual (JEE Advanced)

⚠️ Difficulty Level: HIGH
✔ Multi-concept questions
✔ Entropy & PV-diagram traps

Q2️⃣1️⃣

One mole of an ideal gas undergoes a cyclic process ABCA. Which of the following must be zero after one complete cycle?

A) Net work done
B) Net heat absorbed
C) Change in internal energy
D) Entropy change of surroundings

✔ Correct: C

Q2️⃣2️⃣

In an irreversible adiabatic expansion of an ideal gas:

A) ΔQ = 0
B) ΔU = 0
C) ΔS > 0
D) Temperature must decrease

✔ Correct: A, C

Q2️⃣3️⃣

A gas expands such that PV² = constant. The process is:

A) Isothermal
B) Adiabatic
C) Polytropic
D) Isochoric

✔ Correct: C

Q2️⃣4️⃣

For a Carnot engine, which statement is correct?

A) Efficiency depends on working substance
B) Efficiency depends on temperatures only
C) Entropy change of universe is zero
D) Engine is irreversible

✔ Correct: B, C

Q2️⃣5️⃣

Two identical ideal gases are mixed adiabatically in an isolated container. The entropy change is:

A) Zero
B) Positive
C) Negative
D) Depends on temperature

✔ Correct: A

Q2️⃣6️⃣

A gas absorbs heat Q and does work W. If ΔU is negative, then:

A) Q > W
B) Q < W
C) Q = W
D) Sign cannot be predicted

✔ Correct: B

Q2️⃣7️⃣

For an ideal gas undergoing free expansion:

A) Work done is zero
B) Heat exchanged is zero
C) Entropy increases
D) Temperature increases

✔ Correct: A, B, C

Q2️⃣8️⃣

In which process is entropy constant?

A) Isothermal reversible
B) Adiabatic reversible
C) Irreversible expansion
D) Cyclic irreversible

✔ Correct: B

Q2️⃣9️⃣

Which of the following graphs represent an adiabatic process?

A) Steeper than isothermal curve
B) Less steep than isothermal
C) PV = constant
D) PV^γ = constant

✔ Correct: A, D

Q3️⃣0️⃣

A system violates second law if:

A) Heat flows from hot to cold
B) Heat converts completely into work in cyclic process
C) Entropy of universe decreases
D) Engine efficiency exceeds Carnot efficiency

✔ Correct: B, C, D

✅ Objective Set – Page 3 Completed
➡ Next: Page 4 – Extreme JEE Advanced / Olympiad-Style

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🔥 Thermodynamics – Objective Final Revision

Thermodynamics – Set 1
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