Question

Assertion : If there is some gap between the conduction band and the valence band, electrons in the valence band all remain bound and no free electrons are available in the conduction band. Then the material is an insulator.
Reason : Resistance of insulators is very low.

• A. If both assertion and reason are true and reason is the correct explanation of assertion.
• B. If both assertion and reason are true but reason is not the correct explanation of assertion.
• C. If assertion is true but reason is false.
• D. If both assertion and reason are false.

Answer 1

Answer: (C)

If there is some gap between the conduction band and the valance band electrons in the valance band all remain bound and no free electrons in conduction band then it makes the material an insulator. Resistance of insulators is very high.