Thermodynamic processes are indicated in the following diagram.


Match the following

Column-1			Column-2
P.	Process I		A.	Adiabatic
Q.	Process II		B.	Isobaric
R.	Process III		C.	Isochoric
S.	Process IV		D.	Isothermal

A carnot engine having an efficiency of $${1 \over {10}}$$ as heat engine, is used as a refrigerator. If the work done on the system is 10 J, the amount of energy absorbed from the reservoir at lower temperature is

A given sample of an ideal gas occupies a volume V at a pressure P and absolute temperature T. The mass of each molecule of the gas is m. Which of the following gives the density of the gas ?

The temperature inside a refrigerator is t₂ ^oC. The amount of heat delivered to the room for each joule of electrical energy consumed ideally will be