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Semiconductor Electronic: Material, Devices And Simple Circuits — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsSemiconductor Electronic: Material, Devices And Simple Circuits1 Mark
MCQ
In insulators $........ (C.B$ is conduction band and $V.B$ is valence band$)$
  • A
    $V.B.$ is partially filled with electrons.
  • B
    $C.B.$ is partially filled with electrons.
  • ✓
    $C.B.$ is empty and $V.B.$ is filled with electrons.
  • D
    $C.B$. is filled with electrons and $V.B.$ is empty.
✓

Answer

Correct option: C.
$C.B.$ is empty and $V.B.$ is filled with electrons.
As shown in the image, insulators have a very large forbidden gap. Their conduction band is empty, thus they cannot conduct electricity under normal room temperature and pressure conditions. The valence band is full.

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