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  • 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 syste

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:
 

Option: 1

Both A and R are correct and R is the correct explanation of A
 


Option: 2

A is not correct but R is correct
 


Option: 3

A is correct but R is not correct
 


Option: 4

Both A and R are correct but R is not the correct explanation of A


Answers (1)

best_answer

First law of thermodynamics is based on energy conservation
dQ =dU+ dW 
Here dW → work done on the system so volume decreases.
So dW →  –ve
dQ = dU – dW

Posted by

Pankaj

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