Q115 / 199 · NEET 2008 (Mains) · Physics

If $\mathrm{Q}, \mathrm{E}$ and $\mathrm{W}$ denote respectively the heat added, change in internal energy and the work done in a closed cycle process, then

A
$\mathrm{Q}=0$
B
$W=0$
C
$\mathrm{Q}=\mathrm{W}=0$
Correct answer
D
$\mathrm{E}=0$

Solution

From the $1^{\text {st }}$ law of thermodynamics, $\mathrm{Q}=\mathrm{E}+\mathrm{W}$ For cyclic process, $E=0, \therefore Q=W \neq 0$

Hence, the correct answer is option: 'D'.

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