Magnetism And Electromagnetis Mcqs
Q.1: Magnetism of a magnet can be destroyed by_____________?7
A. heating
B. hammering
C. by inductive action of another magnet%
D. by all above methods
Q.2: Main causes of noisy solenoid are______________?0
A. strong tendency of fan out of laminations at the end caused by repulsion among magnetic lines of forcef
B. uneven bearing surface, caused by dirt or uneven wear between moving and stationary partsY
C. both of above
D. none of the above
Q.3: Core of an electromagnet should have____________?1
A. low coercivity
B. high susceptibility
C. both of the above
D. none of the above
Q.4: Which of the following statements is correct ?.
A. The conductivity of ferrites is better than ferromagnetic materialsC
B. The conductivity of ferromagnetic materials is better than ferritesC
C. The conductivity of ferrites is very high)
D. The conductivity of ferrites is same as that of ferromagnetic materialsG
Q.5: For which of the following materials the net magnetic moment should be zero ?M
A. Diamagnetic materials
B. Ferrimagnetic materials
C. Antiferromagnetic materials
D. Antiferrimagnetic materials
Q.6: Temporary magnets are used in______________?,
A. loud-speakers
B. generators
C. motors
D. all of the above
Q.7: The susceptibility of paramagnetic materials generally lies between____________?P
A. KT3 and 1CT6
B. 1CT3 and 1CT7
C. KT4 and KT8
D. 102 and KT5
Q.8: The attraction capacity of electromagnet will increase if the_______________?M
A. core length increases i
B. core area increases
C. flux density decreases
D. flux density increases
Q.9: For which of the following materials the saturation value is the highest ?J
A. Ferromagnetic materials
B. Paramagnetic materials
C. Diamagnetic materials
D. Ferrites
Q.10: Which of the following materials are diamagnetic ?2
A. Silver
B. Copper
C. Silver and copper
D. Iron

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