The following are the `P-V` diagrams for cyclic processes for a gas. In which of these processes is heat absorbed by the gas?

Options

A. (i),(ii)
B. (ii),(iii)
C. (iii),(iv)
D. (i),(ii),(iii)

Answer

D

Explanation

(i) Clockwise cycle of `P-V` diagram
`DeltaW_(cyclic)=+ve=DeltaW_(cyclic)`
Heat is obsorbed
(ii) Anticlockwise cycle on `V-P` diagram `DeltaW_(cyclic)=+ve=DeltaQ_(cyclic)`
Heat is absorbed
(iii) Clockwise cycle on `P-V` diagram
`DeltaW_(cyclic)=+ve=DeltaQ_(cyclic)`
Heat absorbed
(iv) Clockwise cycle on `V-P` diagram
`DeltaW_(cyclic)=-ve=DeltaQ_(cyclic)`
Heat is rejected