MCQ: Expansion of Gas, Thermodynamics NEET Notes | EduRev

NEET : MCQ: Expansion of Gas, Thermodynamics NEET Notes | EduRev

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Ques: A sample of gas expands from volume V1 to V2.The amount of work done by the gas is greatest when the expansion is (a) adiabatic (b) isobaric (c) isothermal (d) equal in all above cases.

Solution: The amount of work done by the gas is greatest when the expansion is b) Isobaric

The P−V diagram for isobaric, isothermal and adiabatic process of an ideal gas is shown in graph below :

MCQ: Expansion of Gas, Thermodynamics NEET Notes | EduRev

In thermodynamics, for same change in volume, the work done is maximum for the curve having maximum area enclosed with the volume axis. Area enclosed by the curve 

∝ (Slope of curve)

As shown:

(slope)isobaric<(slope)isothermal<(slope)adiabatic

 

⇒ (Area)isobaric>(Area)isorthermal>(Area)adiabatic

 Hence, work done is maximum in isobaric process.

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