Question

A fixed mass m of a gas is subjected to transformation of states from K to L to M to N and back to K as shown in the given figure. The succeeding operations that enable this transformation of states are:

• A. heating, cooling, heating, cooling
• B. cooling, heating, cooling, heating
• C. heating, cooling, cooling, heating
• D. cooling, heating, heating, cooling

Answer 1

Answer: (C)

heating, cooling, cooling, heating

The isobaric process is carried out at constant pressure whereas Isochoric is carried out at constant volume.

From $PV=nRT$, for isochoric process $P\propto T$ and for isobaric process $V\propto T$ .

Heating is carried out when the $T$ increases and cooling occur when $T$ lowers down.

$K\to L\Rightarrow$ Isobaric process, $V$ is increasing $\Rightarrow Heating$

$L\to M\Rightarrow$ Isochoric process, $P$ is decreasing $\Rightarrow Cooling$

$M\to N\Rightarrow$ Isobaric process, $V$ is decreasing $\Rightarrow Cooling$

$N\to K\Rightarrow$ Isochoric process, $P$ is increasing $\Rightarrow Heating$

Therefore, option $C$ is the correct option.