Magnetism and Electromagnetism MCQ Question and Answer
1.Tesla is a unit of
- AField strengthm
- BInductance
- CFlux density
- DFlux
2.A permeable substance is one
- AWhich is a good conductor
- BWhich is a bad conductor
- CWhich is a strong magnet
- DThrough which the magnetic lines of force can pass very easily
3.The materials having low retentivity are suitable for making
- AWeak magnet
- BTemporary magnet
- CPermanent magnet
- DNone of the above
6.Aluminium and platinum are ???. Materials
- AFerromagnetic
- BDiamagnetic
- CParamagnetic
- DNone of the above
7.Ferrites are ________ materials.
- AParamagnetic
- BDiamagnetic
- CFerromagnetic
- DNone of the above
8.Air gap has ?????. reluctance as compared to iron or steel path
- ALittle
- BLower
- CHigher
- DZero
9.The direction of magnetic lines of force is
- AFrom south pole to north pole
- BFrom north pole to south pole
- CFrom one end of the magnet to another end
- DNone of the above
10.Which of the following is the vector quantity?
- ARelative permeability
- BMagnetic field intensity
- CFlux density
- DMagnetic potential
11.The two conductors of a transmission line carry equal current in opposite directions. The force on each conductor is
- Aproportional to I
- Bproportional to the square of currentproportional to distance between the conductors
- Cinversely proportional to the square of current
- Dproportional to the square of current
12. A material which is slightly repelled by a magnetic field is known as
- AFerromagnetic material
- BDiamagnetic material
- CParamagnetic material
- DConducting material
13.When an iron pieces are placed in magnetic field
- AThe magnetic lines of force will bend away from their usual paths in order to go away from the piece
- BThe magnetic lines of force will bend away from their usual paths in order to go away in order to pass through the piece
- CThe magnetic lines of force will not be affected
- DThe iron piece will break
14.Fleming?s left hand rule is used to find
- ADirection of magnetic field due to current carrying conductor
- BDirection of flux in a solenoid
- CDirection of force on a current carrying conductor in a magnetic field
- DPolarity of magnetic pole
15.The ratio of intensity of magnetisation to the magnetisation force is known as
- AFlux density
- BSusceptibility
- CRelative permeability
- DNone of the above
16.Magnetising steel is normal difficult because
- AIt corrodes easily
- BIt corrodes easily
- CIt has low permeability
- DIt has high specific gravity
17.The left hand rule correlates to
- ACurrent, induced e.m.f and direction of force on a conductor
- BMagnetic field, electric field and direction of force on a conductor
- CSelf-induction, mutual induction and direction of force on a conductor
- DCurrent, magnetic field and direction of force on a conductor
18.The unit of relative permeability is
- AHennery/meter
- BHennery
- CIt is dimensionless
- DHennery/sq.m
19.The force between two long parallel conductors is inversely proportional to
- ARadius of conductor
- BCurrent in one conductor
- CProduct of current in two conductor
- DDistance between the conductors
20.Material subjected to rapid reversal of magnetism should have
- ALarge area of B-H loop
- BHigh permeability and low hysteresis loss
- CHigh co-ercivity and high retentivity
- DHigh co-ercivity and low density