🔥 Thermodynamics – Stage 3

Page 8 : Assertion–Reason & Concept Killers (JEE Advanced)

Picture used in Thermodynamics in iit material

These questions test clarity of meaning, not calculation. One wrong interpretation = full negative.

A–R 1️⃣ : Internal Energy

Assertion (A): Internal energy of an ideal gas depends only on temperature.
Reason (R): Ideal gas molecules have no intermolecular forces.

✔ A is TRUE
✔ R is TRUE
✔ R correctly explains A

A–R 2️⃣ : Cyclic Process

A: Net work done in a cyclic process can be zero.
R: Internal energy is a state function.

✔ A is TRUE ✔ R is TRUE ❌ R does NOT explain A

A–R 3️⃣ : Adiabatic Expansion

A: Temperature of gas decreases in adiabatic expansion.
R: Gas does work without heat supply.

✔ A is TRUE ✔ R is TRUE ✔ R correctly explains A

A–R 4️⃣ : Entropy Change

A: Entropy of isolated system always increases.
R: Entropy is a measure of disorder.

✔ A is TRUE ✔ R is TRUE ❌ R is only qualitative, not explanation

Concept Killer 1️⃣

A process is quasi-static but irreversible.

✔ Possible (due to friction, viscosity)

Concept Killer 2️⃣

Isothermal ≠ zero work

✔ ΔU = 0 ✔ W = Q ≠ 0

Concept Killer 3️⃣

Can entropy decrease?

✔ For a system: YES ✔ For universe: NO

Concept Killer 4️⃣

Heat supplied = 0

❌ Does NOT imply adiabatic always (could be cyclic)

Concept Killer 5️⃣

Refrigerator COP can be > 1

✔ True (COP ≠ efficiency)

Final Assertion Trap 🔥

Entropy increase ≠ energy loss

✅ Stage 3 – Page 8 Completed
➡️ Next: Stage 3 – Page 9 (Graph-based + Multi-Concept PYQs)

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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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