In the $p-V$ diagram below, the dashed curved line is an adiabat.For a process that is described by a straight line joining two points $X$ and $Y$ on the adiabat (solid line in the diagram) heat is (Hint consider the variation in temperature from $X$ to $Y$ along the straight line)
KVPY 2013, Advanced
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(c)
As we move along line $X Y$, it cuts a isotherm at higher temperature $\left(T_2 > T_3\right)$
$\left(T_2 > T_3\right)$ but then from $Z$ to $Y$ line moves to a low temperature isotherm. So, heat is absorbed upto $Z$ and then it is released from $Z$ to $Y$.
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