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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 caes i to iv

B

Positive in cases i, ii and iii but zero in case iv

C

Negative in cases i,ii and iii but zero in case iv

D

Zero in all cases.

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