Some materials conduct electricity because they have free electrons or charge carriers that can move easily throughout the material when an electric field is applied. In contrast, non-conductive materials lack these free charge carriers, preventing the flow of electric current.
Contents
MCQs
1. Why do metals conduct electricity?
A. Because they are shiny
B. Because they contain free electrons
C. Because they are hard
D. Because they are heavy
Answer: B. Because they contain free electrons
Explanation: Metals conduct electricity well because they have free electrons that can move easily through the metal, allowing electricity to flow.
2. Which of the following materials is a good conductor of electricity?
A. Wood
B. Plastic
C. Copper
D. Glass
Answer: C. Copper
Explanation: Copper is a metal known for its excellent ability to conduct electricity, which is why it’s commonly used in wires and electrical circuits.
3. What is an insulator?
A. A material that can’t conduct electricity
B. A material that conducts electricity very well
C. A type of metal
D. A type of electricity
Answer: A. A material that can’t conduct electricity
Explanation: Insulators are materials that do not allow electricity to flow through them easily because their electrons are tightly bound and cannot move freely.
4. Which of the following is an example of an insulator?
A. Iron
B. Silver
C. Rubber
D. Gold
Answer: C. Rubber
Explanation: Rubber is an insulator because it does not allow electricity to pass through it easily. It’s often used to cover wires and handles of electrical tools for safety.
5. Why can’t electricity pass through an insulator easily?
A. Because it is too hot
B. Because it has free electrons
C. Because its electrons are tightly bound
D. Because it is too cold
Answer: C. Because its electrons are tightly bound
Explanation: In insulators, the electrons are tightly bound to their atoms and cannot move freely, making it difficult for electricity to pass through.
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