Question

Heat energy absorbed by a system in going through a cyclic process shown in figure is :-

• A. $10^{7}\pi J$
• B. $10^{4}\pi J$
• C. $10^{2}\pi J$
• D. $10^{- 3}\pi J$

Answer 1

Answer: (C)

In a cyclic, $\Delta U=0$
From $FLOT,\Delta Q=\Delta U+\Delta W=0+\Delta W=$ Area
of closed curve
$\Rightarrow Q=\pi r^{2}=\pi \left(\frac{20}{2}\right)^{2}kP_{a}\times $ litre
$=100\pi \times 10^{3}\times 10^{- 3}J=100\pi J$