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Thermodynamics — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsThermodynamics1 Mark
MCQ
A thermodynamic system is taken through the cycle $\text{PQRSP}$ process. The net work done by the system isImage
  • ✓
    $20 \mathrm{~J}$
  • B
    $-20 \mathrm{~J}$
  • C
    $400 \mathrm{~J}$
  • D
    $-374 \mathrm{~J}$
✓

Answer

Correct option: A.
$20 \mathrm{~J}$
Work done by the system $=$ Area of shaded portion on $P-V$ diagram
$[=(300-100)10^{-6} \times(200-10) \times 10^3=20 \mathrm{~J}]$

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