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11.Thermodynamics
medium
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

A
Positive in all cases $(i)$ to $(iv)$
B
Positive in cases $(i), (ii)$ and $(iii)$ but zero in $(iv)$ case
C
Negative in cases $(i), (ii)$ and $(iii)$ but zero in $(iv)$ case
D
Zero in all four cases
Solution
$(d)$ In all given cases, process is cyclic and in cyclic process $\Delta U = 0$
Standard 11
Physics