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 :
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