Choose the only false statement from the following [2005]
are insulators
Text Solution
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In insulators energy gap is of the order of 
to 
and it is practically impossible to impart this much amount of energy to the electrons in valence band.
So as to jump to conduction band.
So, choice is correct.
In semiconductors with the rise in temperature more electrons from valence band jump to conduction band and this results in increase in conductivity. So, choice is correct.
In conductors, the conduction band is either partially filled or the conduction band overlaps on the valence band. So, choice is correct.
In semiconductor, resistivity decreases with increase in temperature.
So, choice is wrong.
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