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Current Electricity

Current Electricity
What voltage drop will be there across a 1 kW electric heater whose resistance when hot is 40 Ω?

200 V
100 V
150 V
50 V

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Current Electricity
A rheostat differs from potentiometer in the respect that it

Has higher wattage rating
Has lower wattage rating
Offers large number of tapping
Has large number of turns

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Current Electricity
One Newton meter is same as

One joule second
Five joules
One joule
One watt

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Current Electricity
A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is

600 Ω
800 Ω
1000 Ω
400 Ω

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

Constantan
Silver
Carbon
Copper

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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?

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

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