P-V Diagrams & Cyclic Processes
Thermodynamic processes are indicated in the following diagram.

Match the following

Show answer and solution
Answer: (a)
- I: vertical line, constant: isochoric (C).
- II: ends on the 300 K curve while dropping steeper than the isotherm: adiabatic (A).
- III: stays on the 500 K curve: isothermal (D).
- IV: horizontal line, constant: isobaric (B).
- So the answer is (a) P→C, Q→A, R→D, S→B.