Heat and Thermodynamics| Practice MCQs Physics for Mdcat | mosaicbro.com

Heat and Thermodynamics| Practice MCQs Physics for Mdcat

7 of 106 questions (Page 13 of 16)

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85 If the temperature of the source increase, the efficiency of the Carnot engine:
Correct Answer: A
Explanation: Efficiency $\eta = 1 - \frac{T_c}{T_h}$ increases with $T_h$.
86 If the temperature of the sink is decreased, the efficiency of a Carnot engine:
Correct Answer: B
Explanation: Efficiency increases as $T_c$ decreases.
87 Which property of a system remains constant during adiabatic change:
Correct Answer: D
Explanation: Entropy remains constant in reversible adiabatic processes.
88 The efficiency of a Carnot engine depends on:
Correct Answer: C
Explanation: Efficiency depends on both $T_h$ and $T_c$: $\eta = 1 - \frac{T_c}{T_h}$.
89 Entropy is the measure of:
Correct Answer: B
Explanation: Entropy quantifies disorder in a system.
90 Net change in entropy of a system in a Carnot’s cycle is:
Correct Answer: C
Explanation: In a Carnot cycle, entropy change is zero (reversible process).
91 When the temperature of source and sink of a heat engine becomes equal, the entropy change will be:
Correct Answer: A
Explanation: Maximum entropy occurs at thermal equilibrium.
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