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The P-V diagram for a thermodynamic system is shown in the figure. The work done by the system during the cyclic process ABCA is

           

1.  Zero

2.  90 J

3.  30 J

4.  60 J

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A gas is compressed isothermally to half its initial volume. The same gas is compressed separately through an adiabatic process until its volume is again reduced to half .Then -

(a) compressing the gas through adiabatic process will require more work to be done
(b) compressing the gas isothermally or adiabatically will require the  same amount work
(c) which of the case (whether compression through isothermal or through adiabatic process) requires more work will depend upon the atomicity of the gas
(d) compressing the gas isothermally will require more work to be done

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An ideal gas is compressed to half its initial volume by means of several process. Which of the process results in the maximum work done on the gas?

(a) Adiabatic

(b) Isobaric

(c) Isochoric

(d) Isothermal

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