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In following figs. Variation of volume b...

In following figs. Variation of volume by change of pressure is shown in Fig. A gas is taken along the path `ABCDA`. The change in internal energy of the tgas will be:

A

positive in all cases from (1) to (4)

B

positive in cases (1), (2) and (3) but zero in case (4)

C

negative in cases (1), (2) and (3) but zero in case (4)

D

zero in all the four cases.

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The correct Answer is:
D
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