NEET Physics Heat Engines Assertion Reason Question
Assertion (A): In a heat engine, the internal energy change is zero over one complete cycle. | Reason (R): The work done by the system in one complete cycle is equal to the heat absorbed by the system.
Both A and R are true and R is the correct explanation of A.
Both A and R are true but R is not the correct explanation of A.
A is true but R is false.
A is false.
Correct Answer
Detailed Explanation
In a heat engine, over one complete cycle, the system returns to its initial state, so the change in internal energy (∆U) is zero. The work done is equal to the heat absorbed minus the heat expelled, which aligns with the first law of thermodynamics.
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