Thermodynamics Question 10

Question 10 - 29 January - Shift 1

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 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 $A$

Show Answer

Answer: (3)

Solution:

Formula: First Law Of Thermodynamics

First law of thermodynamics is based on law of conservation of energy and it can be written as $dQ=dU-dW$.

where $dW$ is work done on the system