Question

A mass of gas is first expanded isothermally and then compressed adiabatically to its original volume. What further simplest operation must be performed on the gas to restore it to its original state ?

• A. An isobaric cooling to bring its temperature to initial value
• B. An isochoric cooling to bring its pressure to its initial value
• C. An isothermal process to take its pressure to its initial value
• D. An isochoric heating to bring its temperature to initial value

Answer 1

The correct option is B An isochoric cooling to bring its pressure to its initial value

the simplest way to bring the initial position gas we have to make the work done zero,so in iso-choric process we get $W_{net}=0$,but option is also mention that heating to bring it's temperature at initial state but by heating its temperature will increase ,hence by cooling it's pressure will reduce hence it will came at initial position.