(figure). Shows the `P-V` diagram of an ideal gas undergoing a change of state from A to B. Four different process I, II, III, IV, as shown in (figure) may lead to the same change of state.

Options

A. Change in internal energy is same in IV and III cases but not in I and II
B. Change in internal energy is same in all the four cases
C. Work done is maximum is Case I
D. Work done is minimum in case II

Answer

B, C

Explanation

From the given initial state A to final state B change in internal energy is same in all the four Cases as it is independent of the path from A to B.
As work done = area under P-V curve therefore, work done is maximum in Case I.