CURRENT ELECTRICITY QUIZ

One Newton meter is same as

Five joules

One joule second

One watt

One joule

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Ohm's law is not applicable to

Semi-conductors

High currents

Small resistors

Dc circuits

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For which of the following 'ampere second' could be the unit?

Energy

Reluctance

Charge

Power

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With rise in temperature the resistance of pure metals

First increases and then decreases

Decreases

Remains constant

Increases

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A thermistor has

Positive temperature coefficient

Negative temperature coefficient

Zero temperature coefficient

Variable temperature coefficient

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With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals

20 W

10 W

60 W

40 W

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The example of non-ohmic resistance is

Copper wire

Carbon resistance

tungsten wire

Aluminium wire

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The resistance of a conductor varies inversely as

Are of cross-section

Resistivity

Length

Temperature

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At 0 K, germanium behaves as

A superconductor

A conductor

A ferromagnetic substance

An insulator

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Voltage dependent resistors are usually made from

Charcoal

Nichrome

Silicon carbide

Graphite

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