# NEET Physics Thermodynamics Questions Solved

An ideal gas is taken through the cycle ABCA, as shown in the figure. If the net heat supplied to the gas in the cycle is 5 J, the work done by the gas in the process CA is

(1) – 5 J

(2) – 10 J

(3) – 15 J

(4) – 20 J

Concept Videos :-

#29 | Work done in Cyclic Process
#30 | Solved Example: 13

Concept Questions :-

Cyclic process

(1) For cyclic process. Total work done $={W}_{AB}+{W}_{BC}+{W}_{CA}$

ΔWAB = PΔV = 10(2 – 1) = 10J and ΔWBC =0

(as V = constant)

ΔQ = ΔU + ΔW

ΔU = 0 (Process ABCA is cyclic)

⇒ ΔQ = ΔWAB + ΔWBC + ΔWCA

⇒ 5 = 10 + 0 + ΔWCA ⇒ ΔWCA = – 5 J

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