Practice important
Insulating Materials
MCQ questions and answers.
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10
MCQ Questions
1. Which of the following is commonly used as an insulating material in electrical wiring?
A.
Copper
B.
Aluminium
C.
Rubber
D.
Iron
Correct Answer:
Rubber
Explanation:
Rubber is a good electrical insulating material because it has very high resistance and does not allow electric current to pass easily.
2. Which material is commonly used as an insulator on overhead electric power lines?
A.
Porcelain
B.
Copper
C.
Silver
D.
Aluminium
Correct Answer:
Porcelain
Explanation:
Porcelain has high electrical resistance and can withstand weather conditions, so it is used to support and insulate overhead power lines.
3. Which of the following is an insulating material?
A.
Glass
B.
Copper
C.
Iron
D.
Aluminium
Correct Answer:
Glass
Explanation:
Glass has very few freely moving charge carriers, so it offers high resistance to the flow of electric current.
4. Which material is widely used to cover electrical wires for safety?
A.
Plastic
B.
Copper
C.
Silver
D.
Steel
Correct Answer:
Plastic
Explanation:
Plastic is used as a covering for wires because it is a poor conductor and helps prevent electric shocks and short circuits.
5. A good insulating material should have which property?
A.
Low electrical resistance
B.
High electrical resistance
C.
High electrical conductivity
D.
Many free electrons
Correct Answer:
High electrical resistance
Explanation:
An insulating material should strongly oppose the movement of electric charges, which means it must have high electrical resistance.
6. Which of the following is a natural insulating material?
A.
Mica
B.
Copper
C.
Aluminium
D.
Iron
Correct Answer:
Mica
Explanation:
Mica is a naturally occurring material with high electrical resistance and is used for insulation in electrical equipment.
7. Which insulating material is often used in capacitors because it can withstand high electric fields?
A.
Mica
B.
Copper
C.
Silver
D.
Aluminium
Correct Answer:
Mica
Explanation:
Mica is used as an insulating dielectric in capacitors because it has high electrical resistance and good dielectric strength.
8. Why is rubber suitable for making handles of electrical tools?
A.
It is a good conductor
B.
It is a good insulator
C.
It produces electric current
D.
It has very low resistance
Correct Answer:
It is a good insulator
Explanation:
Rubber does not allow current to pass easily, so it protects the user from electric shock when used on tool handles.
9. Which of the following materials is commonly used for electrical insulation in cables?
A.
PVC
B.
Copper
C.
Nichrome
D.
Steel
Correct Answer:
PVC
Explanation:
PVC, or polyvinyl chloride, has high electrical resistance and is commonly used to insulate electrical cables.
10. Which material is used as an insulating support in some electrical devices because it is heat-resistant and electrically resistant?
A.
Bakelite
B.
Copper
C.
Silver
D.
Aluminium
Correct Answer:
Bakelite
Explanation:
Bakelite is a heat-resistant plastic with high electrical resistance, making it useful for insulating supports and casings in electrical devices.
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Insulating Materials
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