Thermodynamic processes are indicated in the following diagram.

Match the following:

- AP -> a, Q -> c, R -> d, S -> b
- BP -> c, Q -> a, R -> d, S -> b
- CP -> c, Q -> d, R -> b, S -> a
- DP -> d, Q -> b, R -> a, S -> c
Solution & Step-by-step Explanation
1. Process I is vertical (constant volume) -> Isochoric (c).2. Process IV is horizontal (constant pressure) -> Isobaric (b).3. Between II and III, II is steeper. In an expansion, the adiabatic curve is steeper than the isothermal curve -> II is Adiabatic (a) and III is Isothermal (d).Matching: P-c, Q-a, R-d, S-b.