Thermodynamic processes are indicated in the following diagram.

 

Match the following.

	Column-l		Column-II
P)	Process I	A)	Adiabatic
Q)	Process II	B)	Isobaric
R)	Process III	C)	Isochoric
S)	Process IV	D)	Isothermal

 In process IV, pressure remains constant.
$\therefore$ It is isobaric.
In process III temperature remains constant.
∴ It is isothermal
In process I, volume remains constant.
∴ It is isochoric.
Process II is adiabatic.
So, correct answer is,
P-C, Q-A, R-D, S-B.