magnetism and electromagnetism MCQs – Page 2

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

magnetism and electromagnetism Mcqs
21. Susceptibility is positive for______________?
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A. diamagnetic substances

B. none of the above

C. non-magnetic substances

D. ferromagnetic substances
22. Materials subjected to rapid reversal of magnetism should have______________?
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A. high co-ercivity and high retentivity

B. high co-ercivity and low density

C. large area oiB-H loop

D. high permeability and low hysteresis loss
23. Unit for quantity of electricity is_____________?
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A. joule

B. watt

C. ampere-hour

D. coulomb
24. The relative permeability of materials is not constant
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A. diamagnetic

B. insulating

C. ferromagnetic

D. paramagnetic

25. The working of a meter is based on the use of a permanent magnet. In order to protect the meter functioning from stray magnetic fields______________?
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A. a plastic shielding is provided

B. meter is surrounded by strong magnetic fields

C. a soft iron shielding is used

D. a shielding of anon-magnetic material is used

26. Magnetic moment is a_____________?
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A. vector quantity

B. scalar quantity

C. universal constant

D. pole strength

27. The direction of magnetic lines of force is________________?
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A. from one end of the magnet to another

B. none of the above

C. from south pole to north pole

D. from north pole to south pole
28. A material which is slightly repelled by a magnetic field is known as_____________?
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A. paramagnetic material

B. diamagnetic material

C. conducting material

D. ferromagnetic material

29. A certain amount of current flows through a ring-shaped coil with fixed number of turns. How does the magnetic induction B varies inside the coil if an iron core is threaded into coil without dimensional change of coil ?
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A. Decreases

B. Increases

C. Remains same

D. First increases and then decreases depending on the depth of iron insertion

30. How does the magnetic compass needle behave in a magnetic field ?
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A. None of the above

B. It assures a position which follows a line of magnetic flux

C. It assures a position right angle to magnetic field

D. It starts rotating

31. The ratio of intensity of magnetisation to the magnetisation force is known as_____________?
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A. none of the above

B. susceptibility

C. relative permeability

D. flux density

32. The stray line of magnetic flux is defined as_____________?
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A. a line of magnetic flux in a non-uniform field

B. a line of magnetic flux which does not follow the designed path

C. a line vertical to the flux lines

D. the mean length of a ring shaped coil

33. The relative permeability is less than unity is case of_____________?
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A. ferrites

B. non-ferrous materials

C. ferromagnetic materials

D. diamagnetic materials
34. In the left hand rule, forefinger always represents______________?
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A. direction of force on the conductor

B. voltage

C. current

D. magnetic field
35. Which of the following is not a unit of flux?
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A. Telsa

B. All of the above

C. Maxwell

D. Weber

36. The initial permeability of an iron rod is________________?
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A. the permeability at the end of the iron rod

B. the lowest permeability of the iron rod

C. the permeability almost in non-magnetised state

D. the highest permeability of the iron rod

37. One telsa is equal to___________?
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A. 1 Wb/m2

B. 1 Wb/mm2

C. 1 Wb/m

D. 1 mWb/m2

38. Two infinitely long parallel conductors in vacuum any separated 1 metre between centers >then a current of 1 ampere flows the. uk each conductor, produce on each other a force of_________________?
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A. 2 x KT3 N/m

B. 2 x 1(T2 N/m)

C. 2x 1(T7 N/m)

D. 2 x 10?5 N/m

39. he retentivity (a property) of material is useful for the construction of__________?
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A. electromagnets

B. transformers

C. non-magnetic substances

D. permanent magnets
40. For which of the following materials the saturation value is the highest ?
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A. Ferromagnetic materials

B. Paramagnetic materials

C. Ferrites

D. Diamagnetic materials