CURRENT ELECTRICITY QUIZ

The resistance of a conductor varies inversely as

Length

Resistivity

Temperature

Are of cross-section

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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

12.1 Ω

11 Ω

9 Ω

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The resistance of conductor varies inversely as

Resistivity

Area of cross-section

Temperature

Length

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When one lag of parallel circuit is opened out the total current will

Become zero

Decreases

None of the listed here

Increases

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The rating of a fuse wire is always expressed in

Ampere-hours

kWh

Amperes

Ampere-volts

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Resistance of a material always decreases if

Number of free electrons available becomes more

None of these

Temperature of material is increased

Temperature of material is decreased

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The specific resistance of a metallic conductor ______ with rise in temperature.

Decreases

Remains unchanged

Increases

None of the listed here

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For testing appliances, the wattage of test lamp should be

High

Low

Any value

Very low

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A field of force can exist only between

Two metal particles

Two atoms

Two ions

Two molecules

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SI unit of power is

Watt

Watt-hour

Coulomb

Henry

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