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Current Electricity

Current Electricity
In which of the following substances the resistance decreases with increase in temperature?

Copper
Carbon
Constantan
Silver

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Current Electricity
Two resistances Rl and Ri are connected in series across the voltage source where Rl > Ri. The largest drop will be across

None of them
Rl
Either Rl or Ri
Ri

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Current Electricity
Are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators.

Thermistor
Varistors
Semiconductors
Variable resistors

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Current Electricity
Temperature coefficient of resistance is expressed in terms of

ohms/°C
mhos/ohm°C
ohms/ohm°C
mhos/°C

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

0.6 ohm
0.8 ohm
1.0 ohm
0.4 ohm

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Current Electricity
Electric current is a

Number only
Sometimes scalar and sometimes vector
Scalar quantity
Vector quantity

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