An ideal gas undergoes a cyclic process as shown in diagram. The net work done by the gas in the cycle is
A$12\, litre-atm$
B$24\,J$
C$24\, litre-atm$
D$-24\,J$
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C$24\, litre-atm$
c $\mathrm{W}=$ Area inside cycle $=(12-4) \times(5-2)$
$=24$ litre$-$atm
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An ideal gas of density $\rho=0.2 kg m ^{-3}$ enters a chimney of height $h$ at the rate of $\alpha=0.8 kg s ^{-1}$ from its lower end, and escapes through the upper end as shown in the figure. The cross-sectional area of the lower end is $A_1=0.1 m ^2$ and the upper end is $A_2=0.4 m ^2$. The pressure and the temperature of the gas at the lower end are $600 Pa$ and $300 K$, respectively, while its temperature at the upper end is $150 K$. The chimney is heat insulated so that the gas undergoes adiabatic expansion. Take $g=10 ms ^{-2}$ and the ratio of specific heats of the gas $\gamma=2$. Ignore atmospheric pressure.
Which of the following statement($s$) is(are) correct?
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