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Electricity and Magnetism

7. 

In an electric bulb, a little nitrogen or argon is introduced at low pressure to

A. Cool the hot filament B. withstand atmospheric pressure C. prevent evaporation of element D. increase brightness of the filament

Answer : A. Cool the hot filament

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8. 

The nature of fuse wire is

A. high resistance and low melting point B. high resistance and high melting point C. low resistance and high melting point D. low resistance and low melting point

Answer : A. high resistance and low melting point

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9. 

The newly discovered high temperature super conductors are

A. inorganic polymers B. liquid nitrogen C. metal alloys D. ceramic stars

Answer : A. inorganic polymers

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10. 

Choke is used to

A. reduce the current in AC circuit B. reduce the current in DC circuit C. Convert AC to DC D. Convert DC to AC

Answer : A. reduce the current in AC circuit

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11. 

The filament of an electric bulb is made of

A. Tungsten B. Aluminium C. carbon D. Platinum

Answer : A. Tungsten

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12. 

An electric bulb is connected to a 220 V generator. The current is 0.50 A. What is the power of the bulb?

A. 100 W B. 110 W C. 120 W D. 130 W

Answer : B. 110 W

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