Column $I$ shows certain thermodynamic systems and column $II$ represents thermodynamic properties.

Column $I$		Column $II$
$\left(A\right)$	An ideal gas is filled in a cylindrical vessel of height $h$ which is enclosed by a mass less thermally insulating piston. Mercury is filled above the piston as shown. Now gas is slowly supplied heat. Mercury does not spill.	$\left(P\right)$	Internal energy of the gas is increasing .
$\left(B\right)$	A cylindrical vessel is enclosed by a light piston. The piston is connected to ceiling by an ideal spring as shown in figure. Spring is initially relaxed and then heat is supplied slowly to the ideal gas in the vessel. The system is kept in open atmosphere.	$\left(Q\right)$	Pressure of the gas is increasing.
$\left(C\right)$	A thermally insulated cylindrical vessel is enclosed by a light thermally insulated piston. Some sand is kept on top of piston as shown in figure. The system is kept in open atmosphere. Now sand grains are removed slowly one by one.	$\left(R\right)$	Temperature of the gas is decreasing.
$\left(D\right)$	A good conducting cylindrical vessel is enclosed by a light thermally insulated piston. Some sand is kept on top of piston as shown in figure. The system is kept in open atmosphere. Now sand grains are added slowly one by one.	$\left(S\right)$	Work done by gas is positive.
		$\left(T\right)$	Molar heat capacity of the gas is positive