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11. thermodynamics — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics11. thermodynamics1 Mark
MCQ
For a thermodynamic process $\delta Q = -50$ $calorie$ and $W = -20$ $calorie$ . If the initial internal energy is $-30$ $calorie$ then final internal energy will be ....... $calorie$
  • A
    $191.20$
  • ✓
    $-60$
  • C
    $100$
  • D
    $-100$
✓

Answer

Correct option: B.
$-60$
b
$\delta \mathrm{Q}=\mathrm{W}+\delta \mathrm{U}$

$-50=-20+\left(U_{t}-U_{1}\right)$

$\mathrm{U}_{\mathrm{f}}-(-30)=-30$

$\mathrm{U}_{\mathrm{f}}=-60 \mathrm{Cal}$

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