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Current Electricity

Current Electricity
A copper wire has a resistance of 10 Ω. It is stretched by one-tenth of its original length. Then its resistance will be

9 Ω
11 Ω
10 Ω
12.1 Ω

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Current Electricity
Two lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following statement is correct?

40 W lamp will glow brighter
40 W lamp will fuse
100 W lamp will glow brighter
Both lamps will glow equally bright

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Current Electricity
The substances which have a large number of free electrons and offer a low resistance are called

Inductors
Conductors
Insulators
Semi-conductors

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Current Electricity
Electric current passing through the circuit produces

Magnetic effect
Thermal effect
Chemical effect
Luminous effect

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Current Electricity
Voltage dependent resistors are used

To suppress surges
As current stabilizers
As heating elements
For inductive circuits

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

True component of power
kWh consumed
Losses
Input power

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