JEE Mains · Physics · STD 11 - Thermodynamics
- JEE Mains 2023
- Medium
- MCQ
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
Pick an option to check your answer.
Answer & Solution
Correct Answer
(D) Statement \(I\) is false but Statement \(II\) is true
Step-by-step Solution
Detailed explanation
Statement \(I:\) \(\Delta Q > 0\)
According to \(1^{\text {st }}\) law of thermodynamics
\(\Delta Q =\Delta U + W\)
If \(\Delta Q > 0, \Delta U < 0\) and \(W > 0\) is also possible.
Hence \(\Delta T < 0\), so \(T\) decreases.
Statement \(I\) is false
Statement \(II:\) W \( > 0\)
\(\therefore \int Pdv > 0\)
Therefore volume of system must increase during positive work done by the system.
Statement \(II\) is true
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