Physics - General Knowledge Questions and Answers

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The filament of electric bulb is made up of :

Copper

Nichrome

Lead

Tungsten

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Full form of CFL used in place of electric bulbs is

Compact fluorescent lamp

Constantan filament lamp

Closed filament lamp

Closed fluorescent lamp

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Two electric bulbs marked 25W – 220V and 100W – 220V are connected in series to a 440Vsupply. Which of the bulbs will fuse?

25 W

Both

100 W

Neither

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1 WH =

360 joules

36000 joules

3600 joules

36 joules

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The electrical domestic tube light gives white fluorescent light because of

Colision between molecules of filled gas under electric current

Heavy current

Vacuum inside the tube

Falling of ultra violet rays on the white inner coating of the tube

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The unit for measuring electric power is the

Steridian

Watts

Volts

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The device used to change the speed of an electric fan is

Amplifier

Regulator

Switch

Rectifier

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The material used in electric heater is

Tungsten

Nichrome

Brass

Steel

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After long periods of use, a grey spot develops on the inside of a bulb. This is because

The tungsten filament evaporates and collects there

The heat of the bulb scorches the glass at the top

Dust inside the bulb condenses on the top

Glass undergoes a change due to the heat