MCQEasyJEE Main 2023 · 30 January, Shift 2Second Law & Heat Engines

Physics Question from JEE Main 2023 · 30 January, Shift 2

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Efficiency of a reversible heat engine will be highest at 273C-273^\circ \text{C} temperature of cold reservoir.

Reason R: The efficiency of Carnot’s engine depends not only on the temperature of cold reservoir but it depends on the temperature of hot reservoir too and is given as: η=(1T2T1)\eta = \left( 1 - \frac{T_2}{T_1} \right)

In the light of the above statements, choose the correct answer from the options given below:

  • A

    A is true but R is false

  • B

    Both A and R are true but R is NOT the correct explanation of A

  • C

    A is false but R is true

  • D

    Both A and R are true and R is the correct explanation of A

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