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 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.

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

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