UPSC Physics Atomic Physics Question Bank Modern physics and Sources of energy

      Select the correct statement(s) from the following.

I. In conductors, the valence and conduction bands may overlap.

II. Substances with energy gap of the order of 10 eV are insulators.

III. The resistivity of a semiconductor increases with increase in temperature.

IV. The conductivity of a semiconductor increases with increase in temperature.

A) I and II only

B)        I and III only

C) I, II and IV

D)        I, II, III and IV

Correct Answer: C

Solution :

Not Available