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Current Electricity

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

Copper
Constantan
Carbon
Silver

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

None of the listed here
A conductor
An insulator
A semiconductor

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Current Electricity
Which method can be used for absolute measurement of resistances?

Releigh method
Wheastone bridge method
Lorentz method
Ohm's law method

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

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

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Current Electricity
An instrument which detects electric current is known as

Wattmeter
Rheostat
Voltmeter
Galvanometer

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Current Electricity
One commercial unit of energy equals

One kilowatt-hour
One watt-hour
One watt-hour
Ten kilowatt-hour

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