Q71 / 90 · JEE Main 2023 (08 Apr Shift 1) · Physics
Given below are two statements:
Statement I: If heat is added to a system, its temperature must increase.
Statement II: If positive work is done by a system in a thermodynamic process, its volume must increase.
In the light of the above statements, choose the correct answer from the options given below
Given below are two statements:
Statement I: If heat is added to a system, its temperature must increase.
Statement II: If positive work is done by a system in a thermodynamic process, its volume must increase.
In the light of the above statements, choose the correct answer from the options given below
- AStatement I is true but Statement II is false
- BBoth Statement I and Statement II are false
- CBoth Statement I and Statement II are true
- Correct answerDStatement I is false but Statement II is true
Solution
If heat energy is added to a thermodynamic system, one part increases the internal energy and the other part performs some work.
If heat is added to a system, the system can do work without changing its internal energy. Hence, statement 1 is false.
The formula to calculate the work done is given by
From the above equation, it can be concluded that if , i.e., work is done by the system, its volume must increase. Hence, statement II is true.
Hence, the correct answer is option: 'D'.