CURRENT ELECTRICITY QUIZ

The SI unit of power is

Coulomb

Henry

Watt

Watt-hour

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In an electric kettle water boils in 10 m minutes. It is required to boil the boiler in 15 minutes, using same supply mains

None of these

Length of heating element has no effect on heating if water

Length of heating element should be decreased

Length of heating element should be increased

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A closed switch has a resistance of

About 500 ohms

Zero

Infinity

About 50 ohms

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The flow of current in solids is due to

Nucleus

Electrons and ions

Electrons

Atoms

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A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is

400 Ω

600 Ω

800 Ω

1000 Ω

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A wire having very high value of conductance is said to be

Insulator

Moderately good conductor

Very good conductor

None of the listed here

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Resistance of a carbon filament lamp _______ as the applied voltage increases.

Decreases

None of the listed here

Increases

Remains same

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A copper wire has a resistance of 10 Ω. It is stretched by one-tenth of its original length. Then its resistance will be

10 Ω

11 Ω

9 Ω

12.1 Ω

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In a circuit a 33 Q resistor carries a current of 2 A. The voltage across the resistor is

80 V

33 V

132 V

66 V

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A copper wire is stretched so that its length is increased by 0.1 % . The change in its resistance is

0.4%

0.3%

0.2%

None of the listed here

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