An ideal gas undergoes two processes A and B. One of these is isothermal and the other is adiabatic. Each row of Column-I shows the P-V diagram for the pair; match with Column-II. List - I List - II (

Question

An ideal gas undergoes two processes A and B. One of these is isothermal and the other is adiabatic. Each row of Column-I shows the P-V diagram for the pair; match with Column-II.

List - I	List - II
(A)	(P) Heat supplied during curve A is positive
(B)	(Q) Work done by gas in both processes positive
(C)	(R) Internal energy increases in adiabatic process
(D)	(S) Temperature of gas in process B is constant

TestHub · Accepted Answer

In every row the volume increases, so work done by the gas is positive in both processes.

(A), (C): curve A is the isothermal ( $Δ U = 0$ , $W > 0 \Rightarrow Q > 0$ : P) and work is positive in both (Q).

(B), (D): curve A is the adiabat with work done on the gas, so $Δ U > 0$ (R); B is isothermal, temperature constant (S).

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