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11. thermodynamics — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics11. thermodynamics1 Mark
MCQ
A diatomic gas with rigid molecules does $10\, J$ of work when expanded at constant pressure. What would be the heat energy absorbed by the gas, in this process ..... $J$.
  • A
    $40$
  • B
    $30$
  • ✓
    $35$
  • D
    $25$
✓

Answer

Correct option: C.
$35$
c
For a diatomic gas, $\mathrm{C}_{\mathrm{p}}=\frac{7}{2} \mathrm{R}$

since gas undergoes isobaric process

$\Rightarrow \Delta \mathrm{Q}=\mathrm{n} \frac{7}{2} \mathrm{R\Delta\,T}=\frac{7}{2}({nR\Delta\,T})=35 \mathrm{J}$

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