An ideal gas is taken through the cycle A B C A as shown in the figure. If the net heat supplied to the gas in the cycle is 5 J, the work done by the gas in the process C A is

         

An ideal gas initially at P₁, V₁ is expanded to P₂, V₂ and then compressed adiabatically to the same volume V₁ and pressure P₃. If W is the net work done by the gas in complete process, which of the following is true ?

If c_p and c_v denote the specific heat of nitrogen per unit mass at constant pressure and constant volume respectively, then

The equation of state for 5g of oxygen at a pressure p and temperature T, when occupying a volume V, will be

Which of the following is incorrect regarding the first law of thermodynamics ?

A mono atomic ideal gas, initially at temperature T₁ is enclosed in a cylinder fitted with a friction-less piston. The gas is allowed to expand adiabatically to a temperature T₂ by releasing the piston suddenly. L₁ and L₂ are the lengths of the gas column before and after expansion respectively, then T₁/T₂ is given by

A gas at state A changes to state B through path I and II shown in figure. The changes in internal energy are ΔU₁ and ΔU₂ respectively. Then

An ideal mono atomic gas is taken around the cycle ABCDA as shown in the PV diagram. The work done during the cycle is given by

               

The temperature of source and sink of a heat engine are 127^oC and 27^oC respectively. An inventor claims its efficiency to be 26%, then

One mole of an ideal gas at an initial temperature of T K does 6R joules of work adiabatically. If the ratio of specific heats of this gas at constant pressure and at constant volume is 5/3, the final temperature of gas will be