Electricity and Magnetism TNPSC Group 1 Questions

Physics

Electricity and Magnetism MCQ Questions

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
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ANSWER :
A. Cool the hot filament
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
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ANSWER :
A. high resistance and low melting point
9.
The newly discovered high temperature super conductors are
A.
inorganic polymers
B.
liquid nitrogen
C.
metal alloys
D.
ceramic stars
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ANSWER :
A. inorganic polymers
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
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ANSWER :
A. reduce the current in AC circuit
11.
The filament of an electric bulb is made of
A.
Tungsten
B.
Aluminium
C.
carbon
D.
Platinum
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ANSWER :
A. Tungsten
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
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ANSWER :
B. 110 W