Magnetism And Electromagnetism MCQ

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• The main constituent of permalloy is
  ক

  cobalt

  খ

  chromium

  গ

  nickel

  ঘ

  tungsten
• Unit for quantity of electricity is
  ক

  ampere-hour

  খ

  watt

  গ

  joule

  ঘ

  coulomb
• The initial permeability of an iron rod is
  ক

  the highest permeability of the iron rod

  খ

  the lowest permeability of the iron rod

  গ

  the permeability at the end of the iron rod

  ঘ

  the permeability almost in non-magnetised state
• 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
  ক

  meter is surrounded by strong magnetic fields

  খ

  a soft iron shielding is used

  গ

  a plastic shielding is provided

  ঘ

  a shielding of anon-magnetic material is used
• The unit of relative permeability is
  ক

  henry/metre

  খ

  henry

  গ

  henry/sq. m

  ঘ

  it is dimensionless
• If a copper disc is rotated rapidly below a freely suspended magnetic needle, the magnetic needle shall start rotating with a velocity
  ক

  less than that of disc but in opposite direction

  খ

  equal to that of disc and in the same direction

  গ

  equal to that of disc and in the opposite direction

  ঘ

  less than that of disc and in the same direction
• The bar magnet has
  ক

  the dipole moment

  খ

  monopole moment

  গ

  (A) and (B) both

  ঘ

  none of the above
• Tesla is a unit of
  ক

  field strength

  খ

  inductance

  গ

  flux density

  ঘ

  flux
• Out of the following statements, concerning an electric field, which statement is not true?
  ক

  The electric intensity is a vector quantity

  খ

  The electric field intensity at a point is numerically equal to the force exerted upon a charge placed at that point

  গ

  An electric field is defined as a point in space at which an electric charge would experience a force

  ঘ

  Unit field intensity in the exertion of a force of one newton on a charge of one coulomb
• The force between two long parallel conductors is inversely proportional to
  ক

  Radius of conductors

  খ

  Current in one conductor

  গ

  Product of current in two conductors

  ঘ

  Distance between the conductors
• Ferrites are a sub-group of
  ক

  non-magnetic materials

  খ

  ferro-magnetic materials

  গ

  paramagnetic materials

  ঘ

  ferri-magnetic materials
• Fleming's left hand rule is used to find
  ক

  Direction of magnetic field due to current carrying conductor

  খ

  Direction of flux in a solenoid

  গ

  Direction of force on a current carrying conductor in a magnetic field

  ঘ

  Polarity of a magnetic pole
• Core of an electromagnet should have
  ক

  low coercivity

  খ

  high susceptibility

  গ

  both of the above

  ঘ

  none of the above
• The uniform magnetic field is
  ক

  the field of a set of parallel conductors

  খ

  the field of a single conductor

  গ

  the field in which all lines of magnetic flux are parallel and equidistant

  ঘ

  none of the above
• Ferrites are materials.
  ক

  paramagnetic

  খ

  diamagnetic

  গ

  ferromagnetic

  ঘ

  none of the above
• The commonly used material for shielding or screening magnetism is
  ক

  copper

  খ

  aluminium

  গ

  soft iron

  ঘ

  brass
• The ratio of intensity of magnetisation to the magnetisation force is known as
  ক

  flux density

  খ

  susceptibility

  গ

  relative permeability

  ঘ

  none of the above
• The two conductors of a transmission line carry equal current I in opposite directions. The force on each conductor is
  ক

  proportional to 7

  খ

  proportional to X

  গ

  proportional to distance between the conductors

  ঘ

  inversely proportional to I
• Which of the following is a ferromagnetic material?
  ক

  Tungsten

  খ

  Aluminium

  গ

  Copper

  ঘ

  Nickel
• Air gap has_______eluctance as compared to iron or steel path
  ক

  little

  খ

  lower

  গ

  higher

  ঘ

  zero
• Degaussing is the process of
  ক

  removal of magnetic impurities

  খ

  removing gases from the materials

  গ

  remagnetising metallic parts

  ঘ

  demagnetising metallic parts
• The use of permanent magnets is. not made in
  ক

  magnetoes

  খ

  energy meters

  গ

  transformers

  ঘ

  loud-speakers
• The materials are a bit inferior conductors of magnetic flux than air.
  ক

  ferromagnetic

  খ

  paramagnetic

  গ

  diamagnetic

  ঘ

  dielectric
• The susceptibility of paramagnetic materials generally lies between
  ক

  10^-3 and 10^-5

  খ

  10^-3 and 10^-7

  গ

  10^-4 and 10^-8

  ঘ

  10^-2 and 10^-5
• One telsa is equal to
  ক

  1 Wb/mm²

  খ

  1 Wb/m

  গ

  1 Wb/m²

  ঘ

  1 mWb/m²
• 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?
  ক

  Decreases

  খ

  Increases

  গ

  Remains same

  ঘ

  First increases and then decreases depending on the depth of iron in¬sertion
• How does the magnetic compass needle behave in a magnetic field?
  ক

  It assures a position right angle to magnetic field

  খ

  It starts rotating

  গ

  It assures a position which follows a line of magnetic flux

  ঘ

  None of the above
• Magnetic moment is a
  ক

  pole strength

  খ

  universal constant

  গ

  scalar quantity

  ঘ

  vector quantity
• For which of the following materials the saturation value is the highest?
  ক

  Ferromagnetic materials

  খ

  Paramagnetic materials

  গ

  Diamagnetic materials

  ঘ

  Ferrites
• Magnetising steel is normals difficult because
  ক

  it corrodes easily

  খ

  it has high permeability

  গ

  it has high specific gravity

  ঘ

  it has low permeability