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Semiconductor Electronics question

2005 · Q146
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Semiconductor Electronics question

2005 · Q146

NEETPhysicsSemiconductor ElectronicsMCQ+4 / −1
Choose the only false statement from the following.
  1. A
    In conductors the valence and conduction bands overlap.
  2. B
    Substances with energy gap of the order of 10 eV are insulators.
  3. C
    The resistivity of a semiconductor increases with increase in temperature.
  4. D
    The conductivity of a semiconductor increases with increase in temperature.
View written solutionFree

Correct answer: C

Option (a) is correct as in conductor conduction and valance band overlap and the conduction band is partially filled

Option (b) is correct as insulators have energy gap of 5 - 10 eV.

Option (c) is incorrect as resistivity decreases with increase in temperature.

Option (d) is correct as with increase in temperature, more and more electrons jump to conduction band, hence conductivity increases.

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