During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its temperature. The ratio of $${{{C_p}} \over {{C_p}}}$$ for the gas is

The amount of heat energy required to raise the temperature of 1 g of Helium at NTP, from T₁K to T₂K is

An ideal gas goes from state A to state B via three different processes as indicated in the P-V diagram.



If Q₁, Q₂, Q₃ indicate the heat absorbed by the gas along the three processes and $$\Delta $$U₁, $$\Delta $$U₂, $$\Delta $$U₃ indicate the change in internal energy along the three processes respectively, then

A thermodynamic system is taken through the cycle ABCD as shown in figure. Heat rejected by the gas during the cycle is