P-V Diagrams & Cyclic Processes question from MHT CET 2026 (15 May, Shift 2)

Answer: (b)

1. $P = \text{constant}/V$ means $PV =$ constant, so $T$ is constant (isothermal).
2. From 1 to 2 the volume increases, so pressure decreases: $P_2 < P_1$.
3. $T$-$p$ graph: horizontal line with point 2 at lower $p$ (left) and 1 at higher $p$ (right), which is graph (c).
4. So the answer is (b) c.