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Current Electricity

Current Electricity
If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes

0.4 ohm
0.8 ohm
1.0 ohm
0.6 ohm

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Current Electricity
Eureka has _______ temperature co-efficient of resistance.

Positive
Negative
None of the listed here
Almost zero

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Current Electricity
Conductivity is the reciprocal of

Current density
Resistivity
Resistance
None of the listed here

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Current Electricity
If the number of valence electrons of an atoms is less than 4,the substance is usually

None of the listed here
A conductor
A semiconductor
An insulator

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Current Electricity
Insulators have _______ temperature co-efficient of resistance.

None of the listed here
Negative
Zero
Positive

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Current Electricity
Which of the following materials has the least resistivity ?

Mercury
Zinc
Copper
Lead

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