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

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