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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
Which of the following are correct for insulators?
  • A
    The valence band is partially filled with electrons.
  • B
    The conduction band is partially filled with electrons.
  • C
    The conduction band is partially filled with electrons and valence band is empty.
  • ✓
    The conduction band is empty and the valence band is filled with electrons.
✓

Answer

Correct option: D.
The conduction band is empty and the valence band is filled with electrons.

In insulators, the electrons are very tightly bound to the nucleus. At a room temperature, thermal energy is not enough to push electrons into conduction band. The energy band gap is very high. Thus the conduction band is empty and the valence band is filled with electrons.

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