1. Which of the following is the good conductor of electricity?
Paper
Iron
Glass
Ebonite
Answer: (b) Iron
Explanation: Iron is a good conductor of electricity. Paper, Glass, and Ebonite are insulators which do not allow electricity to pass through them.
2. The SI unit of electric current is ———.
Volt
Faraday
Ampere
Ohms
Answer: (c) Ampere
Explanation: The SI unit of electric current is Ampere.
3. Electrical resistivity of a metallic wire depends upon its ———.
Length
Material
Thickness
Shape
Answer: (b) Material
Explanation: Electrical resistivity of a metallic wire depends upon its thickness.
4. Electric current is measured using ————–.
Galvanometer
Ammeter
Voltmeter
Potentiometer
Answer: (b) Ammeter
Explanation: Ammeter is a device used to measure electricity.
5. Unit of electric power may also be expressed as ————–.
Watt second
Ampere hour
Volt second
Kilowatt hour
Answer: (d) Kilowatt hour
Explanation: Unit of electric power is also expressed in Kilowatt hour.
6. Materials which do not allow electricity to pass through are known as —————–.
Semiconductor
Conductor
Insulator
Semi-insulator
Answer: (c) Insulator
Explanation: Insulators do not pass electric current through them.
7. Tungsten is used in which of the following?
Metal extraction
Electric bulb
Insulators
Textile manufacturing
Answer: (b) Electric bulb
Explanation: Tungsten filament is the main element in the electric bulb.
8. Electric potential is a ————.
Vector quantity
Scalar quantity
Dimensionless quantity
None of the option
Answer: (b) Scalar quantity
Explanation: Since electric potential has only magnitude and no direction, it is a scalar quantity.
9. Copper is used in electric transmission lines because ———————-.
High resistivity
Low resistivity
No resistivity
None of the option
Answer: (b) Low resistivity
Explanation: Since copper offers low resistivity, it is an ideal material to be used in electric transmission.
10. The SI unit of resistance is ————.
Volt
Faraday
Ampere
Ohm
Answer: (d) Ohm
Explanation: Ohm is the SI unit of resistance.
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