(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, bit not in I and II.
B. Change in internal energy is same in all the four cases.
C. Work done is maximum in case I
D. Work done in minimum in case II.

Answer

B, C

Explanation

From the given intial 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. Choices (b) and (c ) are correct.