GENERAL SCIENCE PHYSICS ONE LINERS FOR TNPSC UPSC SSC SET 023
221). 'IC chips' for computers are usually made of
A). lead
B). silicon
C). chromium
D). gold
Answer: silicon
222). Which of the following would be most suitable for making an electromagnet?
A). copper
B). tungsten
C). soft iron
D). steel
Answer: soft iron
223). Which of the following does not rely on the magnetic effect of current for its working?
A). fan
B). telephone receiver
C). carbon microphone
D). dynamo
Answer: carbon microphone
224). Which of the following uses the attractive force on soft iron?
A). carbon microphone
B). telephone receiver
C). simple motor
D). dynamo
Answer: telephone receiver
225). Nichrome wire is used as a heating element in many appliances because
A). it can be drawn out into wires easily
B). it has high resistivity
C). it resists oxidation in air when red hot
D). both (b) and (c) are correct
Answer: both (b) and (c) are correct
226). Which of the following devices converts electrical energy into mechanical energy?
A). dynamo
B). transformer
C). electric motor
D). inductor
Answer: electric motor
227). The starting current of an electric motor is ___ the current flowing after the motor reaches its normal running speed.
A). nearly equal to
B). exactly equal to
C). less than
D). much greater than
Answer: much greater than
228). Energy conversions in a loudspeaker are
A). sound to mechanical to electrical
B). electrical to mechanical to sound
C). sound to electrical to sound
D). mechanical to sound
Answer: electrical to mechanical to sound
229). Energy conversions taking place in a microphone are
A). sound to mechanical to electrical
B). electrical to mechanical to sound
C). sound to mechanical
D). mechanical to sound
Answer: sound to mechanical to electrical
230). The device used for converting mechanical energy into electrical energy is called a/an
A). cell
B). transformer
C). dynamo
D). electric motor
Answer: dynamo
A). lead
B). silicon
C). chromium
D). gold
Answer: silicon
222). Which of the following would be most suitable for making an electromagnet?
A). copper
B). tungsten
C). soft iron
D). steel
Answer: soft iron
223). Which of the following does not rely on the magnetic effect of current for its working?
A). fan
B). telephone receiver
C). carbon microphone
D). dynamo
Answer: carbon microphone
224). Which of the following uses the attractive force on soft iron?
A). carbon microphone
B). telephone receiver
C). simple motor
D). dynamo
Answer: telephone receiver
225). Nichrome wire is used as a heating element in many appliances because
A). it can be drawn out into wires easily
B). it has high resistivity
C). it resists oxidation in air when red hot
D). both (b) and (c) are correct
Answer: both (b) and (c) are correct
226). Which of the following devices converts electrical energy into mechanical energy?
A). dynamo
B). transformer
C). electric motor
D). inductor
Answer: electric motor
227). The starting current of an electric motor is ___ the current flowing after the motor reaches its normal running speed.
A). nearly equal to
B). exactly equal to
C). less than
D). much greater than
Answer: much greater than
228). Energy conversions in a loudspeaker are
A). sound to mechanical to electrical
B). electrical to mechanical to sound
C). sound to electrical to sound
D). mechanical to sound
Answer: electrical to mechanical to sound
229). Energy conversions taking place in a microphone are
A). sound to mechanical to electrical
B). electrical to mechanical to sound
C). sound to mechanical
D). mechanical to sound
Answer: sound to mechanical to electrical
230). The device used for converting mechanical energy into electrical energy is called a/an
A). cell
B). transformer
C). dynamo
D). electric motor
Answer: dynamo
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