Statement - I : Electrical conductivity of semiconductors increases with increasing temperature.
Statement - II : With increase in temperature, large number of electrons from the valence band can jump to the conduction band

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Both statements I and II are correct

Statement-I is incorrect and statement-II is correct

Both statements I and II are incorrect

Statement-I is correct and statement-II is incorrect

answer is A.

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Detailed Solution

The electrical conductivity of a semiconductor increases exponentially with an increase in temperature because as temperature is increased, more electrons get energy and can jump to the conduction band which increases conductivity.
$σ = {Ce}^{\frac{- E_{g}}{2 KT}}$
We can plot this equation as $\log σ vs \frac{1}{T}$ axes to get a linear plot as shown.