# Solve this following

Question:

Directions : Question number 1,2 and 3 are based on the following paragraph. Two moles of helium gas are taken over the cycle $\mathrm{ABCDA}$, as shown in the $\mathrm{P}-\mathrm{T}$ diagram.

The work done on the gas in taking it from $\mathrm{D}$ to $\mathrm{A}$ is :-

1. $-690 \mathrm{R}$

2. $+690 \mathrm{R}$

3. $-414 R$

4. $+414 \mathrm{R}$

Correct Option: , 4

Solution: