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11. thermodynamics — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics11. thermodynamics1 Mark
MCQ
In changing the state of thermodynamics from $A$ to $B$ state, the heat required is $Q$ and the work done by the system is $W.$ The change in its internal energy is
  • A
    $Q + W$
  • ✓
    $Q -W$
  • C
    $Q$
  • D
    $\frac{{Q - W}}{2}$
✓

Answer

Correct option: B.
$Q -W$
b
(b) $\Delta Q = \Delta U + \Delta W$
==> $\Delta U = \Delta Q - \Delta W = Q - W$ (using proper sign)

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