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Current Electricity

Current Electricity
With rise in temperature the resistance of pure metals

Decreases
First increases and then decreases
Remains constant
Increases

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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

0.3%
None of the listed here
0.2%
0.4%

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Current Electricity
Voltage dependent resistors are usually made from

Nichrome
Charcoal
Graphite
Silicon carbide

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Current Electricity
Three 60 W bulbs are in parallel across the 60 V power line. If one bulb burns open

There will be heavy current in the main line
The other two bulbs will light
Rest of the two bulbs will not light
All three bulbs will light

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Current Electricity
Temperature coefficient of resistance is expressed in terms of

mhos/°C
ohms/°C
ohms/ohm°C
mhos/ohm°C

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Current Electricity
Electric current is a

Vector quantity
Number only
Scalar quantity
Sometimes scalar and sometimes vector

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