One mole of a monatomic ideal gas undergoes a cyclic process as shown in the figure (where $V$ is the volume and $T$ is the temperature). Which of the statements below is (are) true?
(image)
$(A)$ Process $I$ is an isochoric process $(B)$ In process $II$, gas absorbs heat
$(C)$ In process $IV$, gas releases heat $(D)$ Processes $I$ and $III$ are $not$ isobaric
IIT 2018, Medium
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$(A)$ Volume $\mathrm{V}$ is decreasing in process $\mathrm{I}$.
$(B)$ $\Delta \mathrm{U}=0, \mathrm{~W}>0$
$\Delta \mathrm{Q}>0$
Process II is isothermal expansion.
$(C)$ $\Delta \mathrm{U}=0, \mathrm{~W}<0$
$\Delta \mathrm{Q}<0$
Process $III$ is isothermal compression.
$(D)$ For an isobaric process $T-\mathrm{V}$ graph must be linear.
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