Pyq- Mobility & Temperature Dependence Of Resistivity

• Q. A good conductor of electricity is a material in which (A) there are few free electrons. (B) there are many free electrons. (C) there are no free electrons. (D) there are equal number of positive and negative charges.

The answer is B. A good conductor of electricity is a material in which there are many free electrons. This is because free electrons can move easily through the material, allowing electricity to flow.

• Q. A good insulator of electricity is a material in which (A) there are few free electrons. (B) there are many free electrons. (C) there are no free electrons. (D) there are equal number of positive and negative charges.

The answer is C. A good insulator of electricity is a material in which there are no free electrons. This is because free electrons can move easily through the material, allowing electricity to flow.