Conductors and Insulators MCQs
Conductors and Insulators – MCQs with Answers & Explanations
Class: 8 |
Subject: Science
Section: 14 – Chemical Effects of Electric Current
Topic: Conductors and Insulators
Board: CBSE Board Examination (Based on NCERT Syllabus)
Section: 14 – Chemical Effects of Electric Current
Topic: Conductors and Insulators
Board: CBSE Board Examination (Based on NCERT Syllabus)
1. Materials that allow electric current to pass through them are called:
Answer: B — Conductors
Conductors have free electrons that allow electric current to flow easily.
Conductors have free electrons that allow electric current to flow easily.
2. Which of the following is a good conductor?
Answer: C — Copper
Copper has many free electrons, making it an excellent conductor.
Copper has many free electrons, making it an excellent conductor.
3. Insulators are materials that:
Answer: B
Insulators lack free electrons, preventing current flow.
Insulators lack free electrons, preventing current flow.
4. Example of an insulator:
Answer: C — Glass
Glass resists electric current and is used in insulation.
Glass resists electric current and is used in insulation.
5. Electric wires are made of copper because it is:
Answer: C
Copper allows efficient transmission of current.
Copper allows efficient transmission of current.
6. The covering of electric wires is made of:
Answer: C — Plastic
Plastic is an insulator that prevents electric shocks.
Plastic is an insulator that prevents electric shocks.
7. Which conducts electricity in liquid form?
Answer: B
Salt solution contains ions that conduct electricity.
Salt solution contains ions that conduct electricity.
8. Distilled water is a:
Answer: B
Lack of ions makes it a poor conductor.
Lack of ions makes it a poor conductor.
9. Graphite is:
Answer: B
10. Best conductor among metals:
Answer: A
11. Wood is generally:
Answer: B
12. Human body conducts electricity due to:
Answer: B
13. Switches are made of:
Answer: B
14. Aluminium is used in wires because:
Answer: B
15. Rubber gloves prevent:
Answer: B
16. Metals are good conductors due to:
Answer: B
17. Plastic is used in plugs because it is:
Answer: B
18. Sea water conducts due to:
Answer: B
19. Insulators are used for:
Answer: A
20. Example of liquid insulator:
Answer: B
