🔥 Thermodynamics – Objective PYQs

Set 2 : Conceptual + Numerical (JEE Advanced)

Instructions: ✔ Single / Multiple correct ✔ Pay attention to sign convention ✔ Think entropy + first law

Q1️⃣1️⃣

A gas is taken through the process shown in the P–V diagram below. If the process is cyclic, then:

A) Net work is zero
B) Net heat absorbed equals net work
C) Internal energy change is zero
D) Entropy change of system is zero

✔ Correct: B, C

Q1️⃣2️⃣

One mole of an ideal gas expands isothermally at temperature T from volume V to 2V. Work done is:

A) RT ln 2
B) 2RT ln 2
C) RT
D) Zero

✔ Correct: A

Q1️⃣3️⃣

In an adiabatic free expansion of an ideal gas:

A) Temperature increases
B) Temperature decreases
C) Temperature remains constant
D) Internal energy remains constant

✔ Correct: C, D

Q1️⃣4️⃣

Which of the following quantities depend only on the state of the system?

A) Work
B) Heat
C) Internal energy
D) Entropy

✔ Correct: C, D

Q1️⃣5️⃣

The efficiency of a Carnot engine depends on:

A) Nature of working substance
B) Hot reservoir temperature
C) Cold reservoir temperature
D) Path of the cycle

✔ Correct: B, C

Q1️⃣6️⃣

A refrigerator works between 300 K and 250 K. Maximum possible COP is:

COP = T_cold / (T_hot − T_cold)

✔ Answer: 5

Q1️⃣7️⃣

In an isobaric process for an ideal gas:

A) W = PΔV
B) ΔU = nC_vΔT
C) Q = nC_pΔT
D) Temperature remains constant

✔ Correct: A, B, C

Q1️⃣8️⃣

Entropy change of the universe is:

A) Zero for reversible process
B) Positive for irreversible process
C) Always zero
D) Negative for natural process

✔ Correct: A, B

Q1️⃣9️⃣

For a monoatomic ideal gas:

A) C_v = (3/2)R
B) C_p = (5/2)R
C) γ = 5/3
D) γ = 7/5

✔ Correct: A, B, C

Q2️⃣0️⃣

Which process results in maximum entropy increase?

A) Reversible isothermal
B) Reversible adiabatic
C) Irreversible expansion
D) Cyclic process

✔ Correct: C

✅ Objective Set – Page 2 Completed
➡ Next: Objective Page 3 (Higher Numerical + PYQ Level)

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🔥 Thermodynamics – Objective Final Revision

Thermodynamics – Set 1
Set 2
Set 3
Set 4
Set 5
Set 6
Set 7
Set 8
Set 9
Set 10
Set 11
Set 12
Set 13
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Set 16
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