Verified Solution • 2025–26 Session moderate

QJEEM23Ph7ac7: JEE Main 2023 Physics - Class 11 JEEM23Ph7ac7 Solution: Given below are two statements: One is labelled as Assertion A…

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

Assertion A: If dQd Q and dWd W 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−dWd 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 options given below:

Multiple Choice Options

  • A Both A and R are correct but R is not the correct explanation of A
  • B Both A and R are correct and R is the correct explanation of A
  • C A is correct but R is not correct
  • D A is not correct but R is correct

Step-by-Step Verified Solution

Heat supplied to the system =dQ=d Q

Work done on the system =−dW=-d W

By the first law of thermodynamics, dQ=dU+dWd Q=d U+d W

We done the work, therefore,

dQ=dU+(−dW)=dU−dWd Q=d U+(-d W) = d U-d W

So, both A and R are correct and R is the correct explanation of A.

Related Learning Resources & Exam Preparation

JEE Main PYQ Question Bank
Browse year-wise authentic previous years' questions with solutions
Authentic CBT Mock Tests
Simulate official exam environment with live timer and percentile scoring