Q139 / 160 · AP EAMCET 2022 (08 Jul Shift 1) · Physics

A gas in a closed container undergoes the cycle $\mathrm{ABCA}$ as shown in the figure. The net heat absorbed by the gas after it has completed 10 cycles is Figure

  • Correct answer
    A
    $-1.5 \mathrm{~kJ}$
  • B
    $+1.5 \mathrm{~kJ}$
  • C
    $+2.25 \mathrm{~kJ}$
  • D
    $-2.25 \mathrm{~kJ}$

Solution

$\Delta \mathrm{Q}=\Delta \mathrm{W} \quad[\because$ process is cyclic $]$ $=-\left[\frac{1}{2} \times 15 \times 20\right] \times 10 \quad[\because$ no. of cycles $=10]$ $=-1500 \mathrm{~J}$ As cycle is anti-clock wise. So $\Delta \mathrm{W}$ is -ve therefore, $\Delta \mathrm{Q}$ is -ve.

Hence, the correct answer is option: 'A'.

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