🔥 Thermodynamics – Objective PYQs
Set 1 : Fundamental Objective Questions (JEE Advanced)
Instructions:
✔ Single / Multiple correct
✔ Conceptual + Numerical
✔ Think before applying formulas
Q1️⃣
An ideal gas undergoes free expansion into vacuum. Which of the following are correct?
- A) Work done = 0
- B) Heat exchanged = 0
- C) Temperature decreases
- D) Internal energy remains same
✔ Correct: A, B, D
Reason: No work, no heat ⇒ ΔU = 0 ⇒ T constant
Reason: No work, no heat ⇒ ΔU = 0 ⇒ T constant
Q2️⃣
For an isothermal process of an ideal gas:
- A) ΔU = 0
- B) Q = W
- C) Pressure remains constant
- D) PV = constant
✔ Correct: A, B, D
Q3️⃣
In an adiabatic expansion of an ideal gas:
- A) Temperature decreases
- B) Entropy remains constant
- C) Heat absorbed is zero
- D) Pressure remains constant
✔ Correct: A, B, C
Q4️⃣
A cyclic process is shown on a P–V diagram. Which is always true?
- A) Net work = area enclosed
- B) Net heat absorbed = net work
- C) Change in internal energy = 0
- D) Entropy change is zero
✔ Correct: A, B, C
Q5️⃣
For an ideal gas, which relation is always valid?
- A) Cp − Cv = R
- B) Cp/Cv = γ
- C) Internal energy depends only on temperature
- D) Cv depends on pressure
✔ Correct: A, B, C
Q6️⃣
A heat engine absorbs 800 J and rejects 500 J. Efficiency is:
η = (800 − 500)/800 = 0.375
✔ Answer: 37.5%
Q7️⃣
Which process gives maximum work for fixed initial and final states?
- A) Free expansion
- B) Irreversible expansion
- C) Reversible isothermal expansion
- D) Isochoric process
✔ Correct: C
Q8️⃣
Entropy change is maximum for:
- A) Reversible process
- B) Irreversible process
- C) Cyclic process
- D) Adiabatic reversible process
✔ Correct: B
Q9️⃣
In which process does temperature remain constant?
- A) Isochoric
- B) Isobaric
- C) Isothermal
- D) Adiabatic
✔ Correct: C
Q🔟
For any real heat engine:
- A) Efficiency can be 100%
- B) Efficiency < Carnot efficiency
- C) Efficiency depends on working substance
- D) Heat rejected cannot be zero
✔ Correct: B, D
✅ Objective Set – Page 1 Completed
➡ Ready for Objective Set – Page 2
➡ Ready for Objective Set – Page 2
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🔥 Thermodynamics – Objective Final Revision
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