Question

In a cyclic process, a gas is taken from state $A$ to $B$ via path $-\text{I}$ as shown in the indicator diagram and taken back to state $A$ from state $B$ via path$-\text{II}$. In the complete cycle:

• A. Work is done on the gas
• B. Heat is given to the gas
• C. Work is done by the gas
• D. Heat is taken from the gas

Answer 1

Answer: (B), (C)

Work is done by the gas

In a cyclic process, $\Delta U=0$
Therefore , we can say that, $W_{net}=Q_{net}$

From the figure, we can deduce that, cycle is clockwise.
$\therefore$ Net work done is positive. Hence, $Q_{net}$ is also positive.

So, we can conclude that, work is done by the gas and heat is given to the gas.

Thus, options (b) and (c) are the correct answers.