In following figures $(a)$ to $(d)$, variation of volume by change of pressure is shown in figure. The gas is taken along the path $A B C D A$. Change in internal energy of the gas will be .......
  • APositive in all cases from $(a)$ to $(d)$
  • BPositive in cases $(a), (b)$ and $(c)$ but zero in case $(d)$
  • CNegative in cases $(a), (b)$ and $(c)$ but zero in case $(d)$
  • D
    Zero in all the four cases
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