The ratio of heat absorbed and work done by the gas in the process, as shown is 5/2. Find the parameters representing x and y axes. 

Temperature and volume

1. If parameters are temperature and pressure straight line will represent constant volume for which dW = 0. Hence, option (1) is wrong.
2. If parameters are volume and pressure, (P \(\propto \frac{1}{V} \)) for constant temperature. \(\Delta U = 0\) for constant temperature and \(\Delta Q = \Delta W\). Hence, \(\frac{dQ}{dW} \neq \frac{5}{2}\). So, option (3) is wrong.
3. Obviously, option (4) is NOT possible.
4. Thus, option (2) is correct.