CURRENT ELECTRICITY QUIZ

Which of the following materials has the least resistivity ?

Zinc

Copper

Mercury

Lead

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If the efficiency of a machine is to be high, what should be low?

kWh consumed

Losses

Input power

True component of power

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Out of the following which is not a poor conductor?

Tungsten

Cast iron

Copper

Carbon

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The flow of current in solids is due to

Atoms

Electrons

Nucleus

Electrons and ions

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Which of the following is the best material for making connecting wires?

Constant

Copper

Nichrome

Manganin

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The resistance of a copper wire 200 m long is 21 ω. If its thickness (diameter) is 0.44 mm, its specific resistance is around

1.8 x 10-8 ω-m

1.2 x 10-8 ω-m

1.6 x 10-8 ω-m

1.4 x 10-8 ω-m

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

Moderately good conductor

Insulator

None of the listed here

Very good conductor

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Varistors are

Resistor with zero temperature co-efficient

Insulators

Non-linear resistors

Carbon resistors

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Voltage dependent resistors are usually made from

Charcoal

Silicon carbide

Graphite

Nichrome

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

Increases

Become zero

Decreases

None of the listed here

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