An ideal diatomic gas is expanded according to the process AB shown in figure. Then select the correct option

From the graph, p∝v⇒p=c.vAgain   pv = nRT ⇒T=cnRv2 so T increasesTherefore, internal energy also increases. As the work done by the gas is positive, by first law of thermodynamics Q=∆U+W ⇒  Q is absorbed by the gas.