Page 339 - General Knowledge

GENERAL KNOWLEDGE 2019

B. Ring magnet
C. Rod magnet
D. Horse shoe magnet

152. The magnetic field lines inside the solenoid are:
A. Concentrated circles
B. Bigger circles
C. Parallel straight lines
D. None of the above

153. What is used to make electromagnets?
A. Circular wire
B. Solenoid
C. Straight wire
D. Horse shoe magnet

154. On what does the strength of magnetic field produced by a current carrying
solenoid depend?
A. Number of turns in solenoid
B. Strength of current
C. Nature of core material
D. All of the above

155. An electromagnet consists of a long coil of insulated copper wire wound on a soft:
A. Aluminium core
B. Silver core
C. Zinc core
D. Iron core

156. Which of the following is not used for making electromagnets?
A. Carbon steel
B. Alnico
C. Cobalt steel
D. All of the above

157. Which of the following factors affects the strength of steel?
A. Number of turns in coil
B. Current flowing in coil
C. Length of air gap between poles
D. All of the above

158. Strong permanent magnets are used in:
A. Microphones
B. Loudspeakers
C. Voltmeters
D. All of the above

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