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JEE Main levelOne or more correct optionsDifficulty 2 of 3ss021

Which of the following statements about electrical conduction in solids are correct?

  1. AThe electrical conductivity of a metal decreases as temperature rises.
  2. BThe electrical conductivity of an intrinsic semiconductor increases as temperature rises.
  3. CIn an insulator, the conductivity increases rapidly with increase of the band gap.
  4. DIn a metal the valence band is either partly filled or overlaps the conduction band.

Answer: A, B, D

In metals, vibrating kernels scatter electrons more at higher temperature, lowering conductivity. In semiconductors more electrons are excited across the small gap as T rises. A larger band gap lowers conductivity, so the third statement is false.
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