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100 Important Magnetism and Electromagnetism MCQ Question and Answer | PDF Free Download

Magnetism and Electromagnetism  MCQ Question and Answer | PDF Free Download

1.Indicate which of the following material does not retain magnetism permanently

  • ASoft iron
  • BStainless steel
  • CHardness steel
  • DNone of the above
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Correct Answer : (A)

Soft iron

Explanation:

2.The main constitute of permalloy is

  • ACobalt
  • BChromium
  • CNickel
  • DTungsten
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Correct Answer : (C)

Nickel

Explanation:

3.The use of permanent magnet is not made in

  • AMagnetos
  • BEnergy meters
  • CTransformers
  • DLoud-speakers
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Correct Answer : (C)

Transformers

Explanation:

4.Paramagnetic materials have relative permeability

  • ASlightly less than unity
  • BEqual to unity
  • CSlightly more than unity
  • DEqual to that ferromagnetic material
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Correct Answer : (C)

Slightly more than unity

Explanation:

5.Degaussing is the process of

  • ARemoval of magnetic impurities
  • BRemoving gases from the materials
  • CRemagnetising metallic parts
  • DDemagnetising metallic parts
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Correct Answer : (D)

Demagnetising metallic parts

Explanation:

6.Substances which have permeability less than the permeability of free space are known as

  • AFerromagnetic
  • BParamagnetic
  • CDiamagnetic
  • DBipolar
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Correct Answer : (C)

Diamagnetic

Explanation:

7.In the left hand rule, fore finger always represents

  • AVoltage
  • BCurrent
  • CMagnetic field
  • DDirection of force on the conductor
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Correct Answer : (C)

Magnetic field

Explanation:

8.Which of the following is a Ferro-magnetic material?

  • ATungsten
  • BAluminium
  • CCopper
  • DNickel
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Correct Answer : (D)

Nickel

Explanation:

9.Ferrites are a sub-group of

  • ANon-magnetic material
  • BFerro-magnetic materials
  • CParamagnetic materials
  • DFerri-magnetic materials
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Correct Answer : (D)

Ferri-magnetic materials

Explanation:

Ferrites are a sub-group of Ferri-magnetic materials.

10.Gilbert is a unit of

  • AElectromotive force
  • BMagneto motive force
  • CConductance
  • DPermittivity
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Correct Answer : (B)

Magneto motive force

Explanation:

11.The working of a meter is based on the use of a permanent magnet. In order to protect the meter functioning from stray magnetic field

  • AMeter is surrounded by strong  magnetic fields
  • BA soft iron shielding is used
  • CA plastic shielding is provided
  • DA shielding of anon-magnetic material is used
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Correct Answer : (B)

A soft iron shielding is used

Explanation:

12.Reciprocal of permeability is

  • AReluctivity
  • BSusceptibility
  • CPermittivity
  • DConductance
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Correct Answer : (A)

Reluctivity

Explanation:

13.The relative permeability is less than unity in case of

  • AFerromagnetic materials
  • BFerrites
  • CNon-ferrous materials
  • DDiamagnetic materials
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Correct Answer : (D)

Diamagnetic materials

Explanation:

The relative permeability is less than unity in case of Diamagnetic materials.

14.The unit of magnetic flux density is

  • AWeber
  • BLumens
  • CTesla
  • DNone of the above
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Correct Answer : (C)

Tesla

Explanation:

15.The magnetism left in the iron after exciting field has been removed is known as

  • APermeance
  • BResidual magnetism
  • CSusceptance
  • DReluctance
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Correct Answer : (B)

Residual magnetism

Explanation:

16.Which of the following is not a unit of flux?

  • AMaxwell
  • BTesla
  • CWeber
  • DAll of the above
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Correct Answer : (B)

Tesla

Explanation:

17.Which of the following expected to have the maximum permeability?

  • ABrass
  • BCopper
  • CZinc
  • DEbonite
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Correct Answer : (D)

Ebonite

Explanation:

Ebonite have the maximum permeability.

18.What is the magneto-motive force (mmf) of a wire with 8 turns carrying three amperes of current?

  • A2,400 AT
  • B240 AT
  • C24 AT
  • D2.4 AT
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Correct Answer : (C)

24 AT

Explanation:

19.When a magnetic is in motion relative to a coil the induced e.m.f does not dependupon

  • Aresistance of the coil
  • BMotion of the magnet
  • CNumbers of turns of coil
  • DPole strength of the magnet
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Correct Answer : (A)

resistance of the coil

Explanation:

20.Super magnetic materials are composed of

  • AFerromagnetic particles in ferromagnetic matrix
  • BNon-ferromagnetic particles in paramagnetic matrix
  • CFerromagnetic particles in a non-ferromagnetic matrix
  • DNone of the above
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Correct Answer : (C)

Ferromagnetic particles in a non-ferromagnetic matrix

Explanation:

Super magnetic materials are composed of Ferromagnetic particles in a non-ferromagnetic matrix.