KNOWLEDGE BASED
REMEMBER
4 Marks
2026
NTA-RE-NEET-2026
MCQ SINGLE
Consider the reversible processes for 1.0 mol of an ideal gas as shown in the figure. $W_{1}$, $W_{2}$, $W_{3}$ and $W_{4}$ represent work done (in calories) in the processes 1, 2, 3 and 4, respectively; $\Delta U_{2}$ and $\Delta U_{4}$ are changes in the internal energy for the processes 2 and 4, respectively. [use $R=2~cal~K^{-1}~mol^{-1}$] The correct option is
(A)
$W_{1}+W_{2}+W_{3}+W_{4}=0$
(B)
$W_{1}+W_{3}=-2T_{1}\ln\frac{V_{2}}{V_{1}}-2T_{2}\ln\frac{V_{4}}{V_{3}}$
(C)
$W_{2}+W_{4}=\Delta U_{2}-\Delta U_{4}$
(D)
$W_{1}+W_{2}=2T_{1}\ln\frac{V_{2}}{V_{1}}$
Correct Answer: B
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