For a process on a system (gas enclosed in a vessel), the P-V
graph is shown in the figure. For this process four statements are given as:
I. During the process, work done by the system is continuously increasing.
II. During the process, work done by the system is zero.
III. During the process, internal energy of the gas is continuously increasing
IV. During the process, heat supplied to the system is continuously increasing.
it is an isothermal process. as gas is expanding work done will be increasing and heat will be continuously absorbed by the gas and internal energy will be constant