🔥 Thermodynamics – Objective Questions

Set 5 : Assertion–Reason & Numerical Logic (JEE Advanced)

✔ Mixed Conceptual + Mathematical
✔ Graph-based & Polytropic traps
✔ First Law mastery check

Assertion–Reason Type:
A) Both A and R true, R explains A
B) Both true, R not explanation
C) A true, R false
D) A false, R true

Q4️⃣1️⃣

Assertion (A): For an ideal gas, internal energy depends only on temperature.

Reason (R): Intermolecular forces in an ideal gas are zero.

✔ Correct: A

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Q4️⃣2️⃣

Assertion (A): In an isothermal expansion of ideal gas, work done equals heat absorbed.

Reason (R): Change in internal energy is zero.

✔ Correct: A

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Q4️⃣3️⃣

Assertion (A): Specific heat at constant pressure is always greater than at constant volume.

Reason (R): At constant pressure, gas does external work.

✔ Correct: A

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Q4️⃣4️⃣

Assertion (A): For a cyclic process, ∮PdV ≠ 0.

Reason (R): Pressure is a path function.

✔ Correct: B

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Q4️⃣5️⃣

An ideal gas undergoes a process PV² = constant. The process is:

• A) Isothermal
• B) Adiabatic
• C) Polytropic (n = 2)
• D) Isochoric

✔ Correct: C

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Q4️⃣6️⃣

In which process, work done is maximum for given initial and final volumes?

• A) Adiabatic
• B) Isothermal
• C) Isochoric
• D) Isobaric

✔ Correct: D

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Q4️⃣7️⃣

The slope of an isothermal curve on a PV diagram is:

• A) −P/V
• B) −V/P
• C) −constant
• D) Zero

✔ Correct: A

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Q4️⃣8️⃣

If γ = Cp/Cv = 1, the process must be:

• A) Isothermal
• B) Adiabatic
• C) Isochoric
• D) Isobaric

✔ Correct: A

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Q4️⃣9️⃣

During which process is heat supplied but temperature remains constant?

• A) Isothermal expansion
• B) Isochoric heating
• C) Adiabatic expansion
• D) Isobaric cooling

✔ Correct: A

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Q5️⃣0️⃣

For an ideal gas, which quantity is path dependent?

• A) Internal energy
• B) Temperature
• C) Heat
• D) Entropy

✔ Correct: C

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✅ Objective Set – Page 5 Completed
➡ Next: Page 6 – Graphical + Match-the-Following (JEE Advanced)

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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
Set 14
Set 15
Set 16
Set 17
Set 18
Set 19
Set 20
Set 21
Set 22
Set 23
Set 24
Set 25
Set 26
Set 27
Set 28
Set 29
Set 30
Set 31
Set 32
Set 33
Set 34
Set 35
Set 36
Set 37
Set 38
Set 39
Set 40
Set 41
Set 42
Set 43
Set 44
Set 45
Set 46
Set 47
Set 48
Set 49
Set 50
Set 51
Set 52
Set 53
Set 54
Set 55
Set 56
Set 57
Set 59

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