NEET Physics Thermodynamics Questions Solved

An ideal gas expands isothermally from a volume V1 to V2 and then compressed to original volume V1 adiabatically. Initial pressure is P1 and final pressure is P3. The total work done is W. Then -

(1) P3>P1,  W>0

(2) P3<P1,  W<0

(3) P3>P1,  W<0

(4) P3=P1,  W=0

(3) From graph it is clear that P3 > P1.

Since area under adiabatic process (BCED) is greater than that of isothermal process (ABDE). Therefore net work done

W=Wi+(WA)    WA>Wi

W < 0

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