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 gas will be:

A

Positive in all cases from (a) to (d)

B

Positive in cases (a), (b) and (c ) but zero in case (d)

C

Negative in cases (a), (b) and (c ) but zero in case (d)

D

Zero in all the four cases

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The correct Answer is:

D

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