One mole of an ideal gas goes from an initial state A to final state B via two processes. It firstly undergoes isothermal expansion from volume V to 3V and then its volume is reduced from 3V to V at constant pressure. The correct P-V diagram representing the two processes is :-

A thermodynamic system is taken through the cycle. ABCD as shown in figure. Heat rejected by the gas during the cycle 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 tree processes and $\Delta U_1, \Delta U_2, \Delta U_3$ indicate the change in internal energy along the three processes respectively, then:-

A gas is taken through the cycle $A\to B\to C\to A,$ as shown. What is the net work done by the gas ?