Thermodynamics – Objective Questions
Page 6 : Graphs, Cycles & Visual Reasoning
Q51. Area under a P–V graph represents:
- A) Heat supplied
- B) Internal energy change
- C) Work done
- D) Entropy change
Answer: C
Explanation: Work done = ∫P dV = area under curve.
Q52. A closed loop on P–V diagram represents:
- A) Isochoric process
- B) Isothermal process
- C) Cyclic process
- D) Adiabatic process
Answer: C
Explanation: System returns to initial state.
Q53. Direction of cycle on P–V diagram is clockwise. Net work is:
- A) Zero
- B) Negative
- C) Positive
- D) Depends on gas
Answer: C
Explanation: Clockwise cycle ⇒ gas does work.
Q54. Which curve is steeper on a P–V diagram?
- A) Isothermal
- B) Adiabatic
- C) Isochoric
- D) Isobaric
Answer: B
Explanation: Adiabatic drops pressure faster than isothermal.
Q55. On T–V diagram, which process is a straight line?
- A) Isothermal
- B) Isochoric
- C) Isobaric
- D) Adiabatic
Answer: C
Explanation: From PV = nRT ⇒ T ∝ V at constant P.
Q56. Which graph gives direct information about entropy change?
- A) P–V
- B) T–S
- C) P–T
- D) V–T
Answer: B
Explanation: Area under T–S curve = heat.
Q57. In a P–V diagram, vertical line represents:
- A) Isothermal
- B) Isobaric
- C) Isochoric
- D) Adiabatic
Answer: C
Explanation: Volume constant.
Q58. In T–S diagram, vertical line means:
- A) Isochoric
- B) Isothermal
- C) Adiabatic
- D) Isobaric
Answer: C
Explanation: Entropy constant ⇒ reversible adiabatic.
Q59. Net heat absorbed in a complete cycle equals:
- A) Change in internal energy
- B) Zero
- C) Net work done
- D) Enthalpy change
Answer: C
Explanation: ΔU = 0 ⇒ Q = W
Q60. Which diagram best represents Carnot cycle?
- A) Rectangle on P–V
- B) Closed loop with two isotherms and two adiabats
- C) Triangle on T–V
- D) Straight line on P–T
Answer: B
Explanation: Carnot cycle = 2 isothermal + 2 adiabatic processes.
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