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 $d Q = d U - d W$
Reason (R): First law of thermodynamics is based on law of conservation of energy.

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Both (A) and (R) are true and (R) is the correct explanation of (A).

(A) is false but (R) is true

Both (A) and (R) are true and (R) is NOT the correct explanation of (A).

(A) is true but (R) is false.

answer is A.

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Detailed Solution

First law of thermodynamics is based on law of conservation of energy and it can be return as $d Q = d U - d W$ .
Where dW is work done on the system.

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