Magnetism and Electromagnetism - Interview Questions | Exam2Win

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76. Which of the following statements is correct ?

A. The conductivity of ferrites is better than ferromagnetic materials

B. The conductivity of ferromagnetic materials is better than ferrites

C. The conductivity of ferrites is very high

D. The conductivity of ferrites is same as that of ferromagnetic materials

Explanation:

77. Main causes of noisy solenoid are

A. strong tendency of fan out of lami-nations at the end caused by repul�sion among magnetic lines of force

B. uneven bearing surface, caused by dirt or uneven wear between moving and stationary parts

C. both of above

D. none of the above

Explanation:

78. A permeable substance is one

A. which is a good conductor

B. which is a bad conductor

C. which is a strong magnet

D. through which the magnetic lines of force can pass very easily

Explanation:

79. Temporary magnets are used in

A. loud-speakers

B. generators

C. motors

D. all of the above

Explanation:

80. The magnetic materials exhibit the property of magnetisation because of

A. orbital motion of electrons

B. spin of electrons

C. spin of nucleus

D. either of these

Explanation:

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