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

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Q.
Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R. [2023]

Assertion A: If $d Q$ and $d W$ 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.

In the light of the above statements, choose the correct answer from the option given below:

1 A is correct but R is not correct

2 A is not correct but R is correct

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

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

Ans.
(3)

First law of thermodynamics is based on the law of conservation of energy and it can be written as

$d Q = d U - d W$

where $d W$ is the work done on the system.

Solution

1 A is correct but R is not correct

2 A is not correct but R is correct

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

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

Ans.
(3)

First law of thermodynamics is based on the law of conservation of energy and it can be written as

$d Q = d U - d W$

where $d W$ is the work done on the system.

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Solution

1 A is correct but R is not correct

2 A is not correct but R is correct

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

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

Ans. (3) First law of thermodynamics is based on the law of conservation of energy and it can be written as dQ=dU-dW where dW is the work done on the system.

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Ans.
(3)

First law of thermodynamics is based on the law of conservation of energy and it can be written as

$d Q = d U - d W$

where $d W$ is the work done on the system.