1. Which of the following is a common electrical insulator?
A.
Copper
B.
Aluminium
C.
Rubber
D.
Iron
Correct Answer:
Rubber
Explanation:
Rubber is a common electrical insulator because it does not allow electric current to pass through it easily.
2. Which material is commonly used as an insulator around electrical wires?
A.
Plastic
B.
Copper
C.
Silver
D.
Aluminium
Correct Answer:
Plastic
Explanation:
Plastic is commonly used to cover electrical wires because it is an insulator and helps prevent electric shocks.
3. Which of the following is an example of an insulating material used in electrical equipment?
A.
Glass
B.
Copper
C.
Iron
D.
Steel
Correct Answer:
Glass
Explanation:
Glass is an electrical insulator because it has very few freely moving charge carriers.
4. Which material is commonly used as an insulator in the handles of electrical tools?
A.
Plastic
B.
Copper
C.
Aluminium
D.
Silver
Correct Answer:
Plastic
Explanation:
Plastic is used for tool handles because it is a common insulator and reduces the chance of current reaching the user.
5. Which of the following is a common natural electrical insulator?
A.
Mica
B.
Copper
C.
Iron
D.
Aluminium
Correct Answer:
Mica
Explanation:
Mica is a common insulating material used in electrical devices because it resists the flow of electric current.
6. Which material is commonly used to support overhead electrical wires as an insulator?
A.
Porcelain
B.
Copper
C.
Silver
D.
Iron
Correct Answer:
Porcelain
Explanation:
Porcelain is commonly used for electrical insulators because it has high resistance and prevents current from flowing to the support.
7. Which of the following materials is commonly used for insulating electrical cables?
A.
Rubber
B.
Copper
C.
Steel
D.
Aluminium
Correct Answer:
Rubber
Explanation:
Rubber is used around electrical cables because it is a common insulator and provides protection against electric current.
8. Which common material is used as an insulator in some electrical switches and sockets?
A.
Bakelite
B.
Copper
C.
Iron
D.
Silver
Correct Answer:
Bakelite
Explanation:
Bakelite is a common electrical insulator used in switches and sockets because it does not conduct current easily.
9. Which of the following is commonly considered an electrical insulator?
A.
Dry wood
B.
Copper
C.
Aluminium
D.
Silver
Correct Answer:
Dry wood
Explanation:
Dry wood is commonly considered an insulator because it offers high resistance to the flow of electric current.
10. Which material is commonly used as an insulating covering for electrical wires?
A.
PVC
B.
Copper
C.
Iron
D.
Silver
Correct Answer:
PVC
Explanation:
PVC is a common insulating plastic used to cover electrical wires and prevent unwanted current flow.
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