JEE Main 2026 (5 Apr, Shift 1) Physics Q32: Thermodynamics

Question

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Statement I: Change in internal energy of a system containing $n$ mole of ideal gas can be written as $\Delta U = n\,C_v\,(T_f - T_i) = \frac{nR}{\gamma - 1}(T_f - T_i)$, where $\gamma = \frac{C_p}{C_v}$, $T_i$ = initial temperature, $T_f$ = final temperature.
Statement II: Relation between degree of freedom $f$ and $\gamma$ ($= C_p/C_v$) is $\left(\gamma = 1 + \frac{2}{f}\right)$
Choose the correct answer from the options given below

Accepted Answer

Option 2: Both A and R are true but R is NOT the correct explanation of A

Answer

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

Answer

Both A and R are true but R is NOT the correct explanation of A

Answer

A is true but R is false

Answer

A is false but R is true

JEE Main 5 April 2026, Shift 1, Physics Q32

Same idea in other shifts