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magnetism and electromagnetism MCQs

Practise focused magnetism and electromagnetism questions with marked answers for exam preparation and subject revision.

magnetism and electromagnetism Mcqs

1. Ferrites are materials
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A. diamagnetic

B. none of the above

C. paramagnetic

D. ferromagnetic

2. The bar magnet has____________?
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A. monopole moment

B. the dipole moment

C. none of the above

D. A. and B. both

3. Which of the following is a vector quantity ?
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A. Flux density

B. Magnetic potential

C. Magnetic field intensity

D. Relative permeability

4. Tesla is a unit of_____________?
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A. flux density

B. flux

C. field strength

D. inductance

5. The materials having low retentivity are suitable for making_____________?
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A. temporary magnets

B. weak magnets

C. none of the above

D. permanent magnets

6. A magnetic field exists around____________?
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A. copper

B. iron

C. aluminium

D. moving charges

7. In a simple magnetic field the strength of magnet flux_______________?
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A. is constant and has same value in energy part of the magnetic field

B. increases continuously from initial value to final value

C. first increases and then decreases till it becomes zero

D. decreases continuously from initial value to final value

8. What will be the current passing through the ring shaped air cored coil when number of turns is 800 and ampere turns are 3200 ?
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A. 4

B. 6

C. 2

D. 8

9. The materials are a bit inferior conductors of magnetic flux than air
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A. paramagnetic

B. diamagnetic

C. dielectric

D. ferromagnetic

10. A permanent magnet______________?
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A. attracts only ferromagnetic substances

B. attracts ferromagnetic substances and repels all others

C. attracts all paramagnetic substances and repels others

D. attracts some substances and repels others

11. A square cross-sectional magnet has a pole strength of 1 x 10 Wb and cross sectional area of 20 mm x 20 mm. What is the strength at a distance of 100 mm from the unit pole in air ?
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A. 63.38 N/Wb

B. 633.8 N/Wb

C. 63380 N/Wb

D. 6338 N/Wb

12. Reciprocal of permeability is____________?
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A. permittivity

B. susceptibility

C. reluctivity

D. conductance

13. A conductor of length L has current I passing through it, when it is placed parallel to a magnetic field. The force experienced by the conductor will be______________?
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A. BLI2

B. BLI

C. zero

D. B2LI

14. Which of the following is the unit of magnetic flux density ?
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A. tesla

B. none of the above

C. weber

D. lumens

15. The change of cross-sectional area of conductor in magnetic field will affect______________?
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A. reluctance of conductor

B. resistance of conductor

C. A. and B. both in the same way

D. none of the above

16. The attraction capacity of electromagnet will increase if the_______________?
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A. flux density decreases

B. flux density increases

C. core length increases i

D. core area increases

17. A permeable substance is one_____________?
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A. which is a good conductor

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

C. which is a strong magnet

D. which is a bad conductor

18. When an iron piece is placed in a magnetic field_____________?
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A. the magnetic field will not be affected

B. the magnetic lines of force will bend away from their usual paths in order to go away from the piece

C. the magnetic lines of force will bend away from their usual paths in order to pass through the piece

D. the iron piece will break

19. Magnetism of a magnet can be destroyed by_____________?
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A. hammering

B. by inductive action of another magnet

C. heating

D. by all above methods

20. The magneto-motive force is______________?
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A. the voltage across the two ends of exciting coil

B. the passage of magnetic field through an exciting coil

C. the sum of all currents embraced by one line of magnetic field

D. the flow of an electric current

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