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Model Paper 10 — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsModel Paper 101 Mark
MCQ
Assertion (A): Efficiency of a Carnot engine increases on reducing the temperature of sink.
Reason (R): The efficiency of a Carnot engine is defined as ratio of net mechanical work done per cycle by the gas to the amount of heat energy absorbed per cycle from the source.
  • A
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true but R is not the correct explanation of A.
  • C
    A is true but R is false.
  • D
    A is false but R is true.
✓

Answer

(b) Both A and R are true but R is not the correct explanation of A .
Explanation: Efficiency of Carnot cycle $\eta=\frac{W}{Q_1}=1-\frac{T_2}{T_1}$, for carnot engine when $T _2$ decrease $\eta$ increase.

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