Thermodynamics – Objective Questions

Page 10 : Final Revision + Exam Hall Strategy

🔁 Ultra-Quick Concept Revision

• ΔU = Q − W (First Law)
• Ideal gas → U depends only on T
• Isothermal: ΔU = 0 → Q = W
• Adiabatic: Q = 0 → W = −ΔU
• Isochoric: W = 0 → Q = ΔU
• Cyclic: ΔU = 0

📐 Formula Capsule (Must-Remember)

• PV = nRT
• Cp − Cv = R
• γ = Cp / Cv
• Adiabatic: PV^γ = constant
• Work (Isothermal): W = nRT ln(V₂/V₁)
• Carnot efficiency: η = 1 − T₂/T₁

📊 Graph Interpretation Traps

• Area under P-V curve = Work
• Steeper adiabatic than isothermal
• Isochoric → vertical line
• Isobaric → horizontal line
• Clockwise cycle → engine
• Anti-clockwise → refrigerator

⚠️ Common Mistakes (Avoid in Exam)

• Heat stored ❌ (Heat is not state function)
• Adiabatic always fast ❌
• ΔU ≠ 0 for all processes ❌
• Efficiency depends on gas ❌
• Work path-independent ❌

🎯 IIT-JEE Question Selection Strategy

• Solve graph-based questions first
• Then formula-direct questions
• Skip long derivation traps initially
• Check sign convention carefully
• Units → Kelvin mandatory

⏱️ Last 10 Minutes Checklist

• Recheck Carnot efficiency questions
• Verify signs of W and Q
• Confirm process type (iso / adiabatic)
• Temperature in Kelvin ✔
• Multi-correct marked carefully ✔

🔥 Final Words

Thermodynamics is not memory.
It is logic + discipline + clarity.

If you mastered this page,
IIT physics will not scare you.

Thermodynamics Module – COMPLETED ✅

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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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📘 Complete Physics Libraries

• SHM – Complete Library
• Waves – Objective Library
• Gravitation – Complete Library
• Momentum & Collisions
• Centre of Mass
• Work, Energy & Power
• WEP – Intermediate Notes
• Motion in a Plane

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• IIT–JEE Physics Master Library
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