Question

A thermodynamic system is taken through the cycle PQRSP process. The net work done by the system is

• A. 20 J
• B. -20 J
• C. 400 J
• D. -374 J

Answer 1

The correct option is B -20 J

Work done by the system = Area of shaded portion on P-V diagram
$=(300-100){10}^{-}6\times (200-10)\times {10}^3=20J$
and direction of process is anticlockwise so work done will be negative i.e. $\Delta W=-20J$