In the diagrams $(i)$ to $(iv)$ of variation of volume with changing pressure is shown. A gas is taken along the path $ABCD. $ The change in internal energy of the gas will be
APositive in all cases $(i)$ to $(iv)$
BPositive in cases $(i), (ii)$ and $(iii)$ but zero in $(iv)$ case
CNegative in cases $(i), (ii)$ and $(iii)$ but zero in $(iv)$ case
D
Zero in all four cases
Medium
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D
Zero in all four cases
d $(d)$ In all given cases, process is cyclic and in cyclic process $\Delta U = 0$
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