Question

Choose the false statement from the following.

(a) In conductors the valence and conduction band overlap

(b) Substances with an energy gap of the order of 10 eV are insulators

(c) The resistivity of a semiconductor increases with increase in temperature

(d) The conductivity of a semiconductor increases with increase in temperature

I had been asked this question during a job interview.

This is a very interesting question from Intrinsic Semiconductor in division Semiconductor Electronics : Materials, Devices and Simple Circuits of Physics – Class 12

Answer 1

Right answer is (c) The resistivity of a semiconductor increases with increase in temperature

The best explanation: Resistivity of a semiconductor and temperature are inversely proportional to each other. When the resistivity of a semiconductor decreases, the temperature increases. Semiconductors have bulk resistivity in the range of 10^3-ohm cm.