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JEE PHYSICS MCQ: THERMODYNAMICS

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Analyzing +4 | -1
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 −273∘C- 273^\circ C temperature of cold reservoir.

Reason R: The efficiency of Carnot’s engine depends not only on temperature of cold reservoir but it depends on the temperature of hot reservoir too and is given as η=(1−T2T1)\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
View answer and explanation
Correct option: A
Both A and R are true and R is the correct
explanation of A
Option A (Both A and R are true and R is the correct explanation of A) is correct because the efficiency of a reversible heat engine is highest at 0K (-273°C) and the Carnot efficiency equation explains this dependence on both hot and cold reservoir temperatures.

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