Given below are two statements: One is labelled as Assertion A and… | JEE Main 2023 (29 Jan, Shift 1)

Q10JEE Main 2023 · 29 JAN · SHIFT 1Easy

Heat, Work & First Law of Thermodynamics

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: If $dQ$ and $dW$ represent the heat supplied to the system and the work done on the system respectively. Then according to the first law of thermodynamics $dQ = dU - dW$ . Reason R: First law of thermodynamics is based on law of conservation of energy. In the light of the above statements, choose the correct answer from the options given below:

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Answer: (b)

First law: $dQ = dU + dW_{by}$ . Work done on the system $dW = -dW_{by}$ , so $dQ = dU - dW$ . A is correct.
The first law is a statement of conservation of energy, so R is correct and explains A.
So the answer is (b).

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Heat, Work & First Law of Thermodynamics question from JEE Main 2023 (29 Jan, Shift 1)

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