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Thermodynamics — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsThermodynamics1 Mark
MCQ
In adiabatic expansion
  • A
    $\Delta U=0$
  • ✓
    $\Delta U=$ negative
  • C
    $\Delta U=$ positive
  • D
    $\Delta W=$ zero
✓

Answer

Correct option: B.
$\Delta U=$ negative
In case of adiabatic expansion $\Delta W=$ positive and $\Delta Q=0$
from FLOT $(\Delta Q=\Delta U+\Delta W) \Rightarrow \Delta U=-\Delta W \quad$ i.e., $\Delta U$ will be negative.

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