Assertion :Efficiency of a heat engine can't be greater than efficiency of Carnot's engine. Reason: Efficiency of any engine is never $100 %$ .

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Efficiency of the heat engine $η$ is highest for Carnot's cycle. This is a memory based fact.
Also the second law of thermodynamics tells us that it is impossible to create perpetual motion machine of the first kind, which is an engine of $100 %$ efficiency.
Hence both statements are true but the reason is not the correct explanation of the assertion.

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Assertion :Efficiency of a heat engine can't be greater than efficiency of Carnot's engine. Reason: Efficiency of any engine is never 100%.

Assertion :Efficiency of a heat engine can't be greater than efficiency of Carnot's engine. Reason: Efficiency of any engine is never $100 %$ .