Conductors and Non-Conductors NDA Questions

NDA Physics

Conductors and Non-Conductors MCQ Questions


13.
What is the role of a dielectric in a capacitor?
A.
Conduct electricity
B.
Store electric charge
C.
Reduce resistance
D.
Increase capacitance
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ANSWER :
D. Increase capacitance
14.
Which of the following is an example of a dielectric material?
A.
Copper
B.
Rubber
C.
Silicon
D.
Mica
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ANSWER :
D. Mica
15.
What is the primary function of an insulator?
A.
Conduct electricity
B.
Conduct heat
C.
Resist electric current
D.
Provide structural support
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ANSWER :
C. Resist electric current
16.
Which of the following is NOT a use of conductive materials?
A.
Electrical wiring
B.
Thermal insulation
C.
Circuit boards
D.
Electromagnets
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ANSWER :
B. Thermal insulation
17.
What happens to the resistance of an insulator when the temperature increases?
A.
Decreases
B.
Increases
C.
First increases then decreases
D.
Remains constant
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ANSWER :
A. Decreases
18.
Which type of materials are typically used as insulators in high-voltage applications?
A.
Metals
B.
Ceramics
C.
Semiconductors
D.
Polymers
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ANSWER :
B. Ceramics