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Current Electricity

Current Electricity
Semiconductors have _______temperature co-efficient of resistance.

None of the listed here
Positive
Negative
Zero

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Current Electricity
Electrical current is due to the flow of

Negative charges only
Both positive and negative charges
Positive charges only
Neutral particles only

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

0.2%
None of the listed here
0.4%
0.3%

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

A semiconductor
An insulator
None of the listed here
A conductor

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Current Electricity
A resistance having rating 10 ohms , 10 W is likely to be a

Carbon resistor
Variable resistor
Metallic resistor
Wire wound resistor

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Current Electricity
The hot resistance of the bulb's filament is higher than its cold resistance because the temperature coefficient of the filament is

About 2 ohms per degree
Positive
Zero
Negative

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