The figure shows the volume $V$ versus temperature $T$ graphs for a certain mass of a perfect gas at two constant pressures of $P_1$ and $P_2$. What inference can you draw from the graphs?

The expansion of an ideal gas of mass $m$ at a constant pressure $P$ is given by the straight line $D$. Then the expansion of the same ideal gas of mass $2m$ at a pressure $P/ 2 $ is given by the straight line

The adjoining figure shows graphs of pressure and volume of a gas at two temperatures $T_1$ and $T_2$. Which of the following is correct ?

$1\,\, gm$ water at $100\,^oC$and $10^5\,\,Pa$ pressure converts into $1841\,\,cm^3$ of steam at constant temperature and pressure. If latent heat of vapourization of water is $2250 \,\,J/gm$. The change in internal energy of water in this process is ….. $J$

The average degree of freedom per molecule of a gas is $6$. The gas performs $25\  J$ work, while expanding at constant pressure. The heat absorbed by the gas is   …. $J$