Thermodynamics – Objective Set

Page 1 : Questions 1–10 (IIT-JEE Advanced)

Q1. For an ideal gas undergoing an isothermal expansion, which statement is correct?

• A) ΔU > 0
• B) ΔU < 0
• C) ΔU = 0
• D) Depends on pressure

Answer: C

Explanation: Internal energy of ideal gas depends only on temperature. Isothermal ⇒ ΔT = 0 ⇒ ΔU = 0.

Q2. In which process is work done always zero?

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

Answer: C

Explanation: Isochoric ⇒ Volume constant ⇒ W = ∫PdV = 0.

Q3. A gas absorbs heat Q and does work W. The increase in internal energy is:

• A) Q + W
• B) Q – W
• C) W – Q
• D) Zero

Answer: B

Explanation: First law: ΔU = Q – W (work done by system).

Q4. Which quantity is NOT a state function?

• A) Pressure
• B) Temperature
• C) Work
• D) Internal energy

Answer: C

Explanation: Work depends on path, not just state.

Q5. In an adiabatic expansion of an ideal gas:

• A) Temperature remains constant
• B) Heat absorbed is maximum
• C) Temperature decreases
• D) Internal energy increases

Answer: C

Explanation: Q = 0, work is done ⇒ ΔU = –W ⇒ temperature falls.

Q6. Area under a P–V graph represents:

• A) Heat
• B) Change in energy
• C) Work done
• D) Entropy

Answer: C

Explanation: Work done = ∫PdV = area under PV curve.

Q7. Two processes take a gas from same initial to same final state. Which is same?

• A) Work
• B) Heat
• C) Internal energy
• D) All

Answer: C

Explanation: Internal energy is a state function.

Q8. Which process has maximum work for same initial and final volume?

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

Answer: C

Explanation: Isothermal curve lies above adiabatic ⇒ larger area.

Q9. If heat supplied equals work done, the process is:

• A) Isochoric
• B) Isothermal (ideal gas)
• C) Adiabatic
• D) Isobaric

Answer: B

Explanation: Q = W ⇒ ΔU = 0 ⇒ constant temperature.

Q10. Which statement is ALWAYS true?

• A) Heat is conserved
• B) Work is conserved
• C) Energy is conserved
• D) Entropy of system always increases

Answer: C

Explanation: First law = conservation of energy.

Page 1 Completed ✔
Difficulty: ⭐⭐ to ⭐⭐⭐ (Foundation + traps)

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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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