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MCQs on Electricity and Magnetism Fundamentals
Engineering Reviewer - Electricity and Magnetism Fundamentals
Multiple Choice Questions
Electricity and Magnetism FundamentalsMultiple Choice Questions
Electricity and Magnetism Fundamentals

51. The ratio of the permeability of material to the permiability of air or vacuum.
A. Relative permeability
B. Relative permitivity
C. Relative conductivity
D. Relative reluctivity

52. Permeance is analogous to
A. Conductance
B. Reluctance
C. Admittance
D. Resistance

53. The property of magnetic materials of retaining magnetism after withdrawal of the magnetizing force is known as
A. Retentivity
B. Reluctivity
C. Resistivity
D. Conductivity

54. The quantity of magnetism retained by a magnetic material after withdrawal of the magnetizing force is called
A. Leftover magnetism
B. Hysteresis
C. Residual magnetism
D. Coercivity

55. The amount of magnetizing force to counter balance the residual magnetism of a magnetic material is referred to as
A. Reluctivity
B. Susceptivity
C. Coercivity
D. Retentivity

56. The ratio of the total flux (flux in iron path) to the useful flux (flux in air gap)
A. Leakage flux
B. Leakage current
C. Leakage coefficient
D. Leakage factor

57. Defined as the number of lines per unit area through any substance in a plane at right angles to the lines of force
A. Flux
B. Flux lines
C. Flux density
D. Flux intensity

58. Defined as the flux density produced in it due to its own induced magnetism
A. Magnetic field intensity
B. Electric field intensity
C. Electromagnetic field intensity
D. Intensity magnetization

59. The force acting on a unit n- pole placed at that point is called
A. Magnetic field intensity
B. Electric field intensity
C. Electromagnetic field intensity
D. Intensity magnetization

60. The ratio between the intensity of magnetization produced in a substance to the magnetizing force producing it
A. Magnetic Reluctivity
B. Magnetic Resistivity
C. Magnetic susceptibility
D. Magnetic conductivity

61. The lagging effect between flux density of the material and the magnetizing force applied
A. Permeance
B. Eddy current
C. Hysteresis
D. Reluctance

62. Refers to the magnetic lines
A. Flux
B. Hysteresis
C. Current
D. Magnetomotive force

63. Refers to the non- metallic materials that have the ferromagnetic properties of iron.
A. Ferrites
B. Ferromagnetic
C. Diamagnetic
D. Paramagnetic

64. The air space between poles of magnets
A. Air gap
B. Free space
C. Vacuum
D. Atmosphere

65. One that has magnetic poles produced by internal atomic structure with no external current necessary
A. Diamagnetic
B. Permanent magnets
C. Paramagnetic
D. Electromagnetic

66. Magnetic effects of the earth as a huge magnet with north and south poles.
A. Diamagnetic
B. Ferromagnetic
C. Terrestrial magnetism
D. Terrestrial ferromagnetism

67. Used to maintain strength of magnetic field
A. Container
B. Air gap
C. Keeper
D. Source

68. All magnetic field originates from
A. moving electric charge
B. Iron atoms
C. Magnetic domain
D. Permanent magnets

69. Magnetic  fields do not interact with
A. Moving permanent magnets
B. Stationary permanent magnets
C. Moving electric charges
D. Stationary electric charges

70. The magnetic field inside a solenoid
A. is zero
B. is uniform
C. increases with distance from the axis
D. decreases with distance from the axis

71. When the ferromagnetic substance is inserted in a current- carrying solenoid, the magnetic field is
A. Greatly decreased
B. Greatly increased
C. Slightly decreased
D. Slightly increased

72. The magnetic field of a bar magnet most closely resembles the magnetic field of
A. a horseshoe magnet
B. a straight current- carrying wire
C. a stream of electrons moving parallel to one another
D. a current- carrying wire loop

73. The magnetic field of a magnetized iron bar when strongly heated
A. Becomes weaker
B. Becomes stronger
C. Reverses in direction
D. is unchanged

74. A permanent magnet does not exert a force on
A. an unmagnetized iron bar
B. a magnetized iron bar
C. a moving electric charge
D. a stationary electric charge

75. A current if flowing east along a power line. If the earth’s field is neglected, the direction of the magnetic field below it is
A. North
B. South
C. East
D. West

76. The emf produced in a wire by its motion across a magnetic field does not depend upon the
A. Diameter of the wire
B. Length of the wire
C. Orientation of the wire
D. Flux density of the field

77. The induced emf in a wire loop that is moved parallel to a uniform magnetic field is
A. Zero
B. Dependent on the area of the loop
C. Dependent on the shape of the loop
D. Dependent on the magnitude of the field

78. When a wire loop is rotated in a magnetic field the direction of the induced emf changes one in every _______ revolution
A. 1/3
B. 1/2
C. 1/4
D. 2/3

79. The magnetic flux through a wire loop in a magnetic field does not depend on
A. The area of the loop
B. The magnitude of the field
C. The shape of the loop
D. The angle between the plane of the loop and the direction

80. Steel is hard to magnetize because of its
A. Low permeability
B. High permeability
C. High density
D. High retentivity

81. Paramagnetic substance has a relative permeability of
A. Slightly less than one
B. Equal to one
C. Slightly equal to one
D. Very much greater than one

82. A group of magnetically aligned atoms is called
A. Range
B. Lattice
C. Domain
D. Crystal

83. The force between two magnetic poles varies with the distance between them. The variation is ______ to the square of that distance.
A. Equal
B. Greater than
C. Directly proportional
D. Inversely proportional

84. Permeability means
A. The conductivity of the material for magnetic lines of force
B. The magnetization test in the material after exciting field has been removed
C. The strength of an electromagnet
D. The strength of the permanent magnet

85. ______ is an electromagnet with its core in the form of a close magnetic ring.
A. Solenoid
B. Paraboloid
C. Toroid
D. Cycloid

86. A magnetic material losses its ferromagnetic properties at a point called
A. Curie temperature
B. Inferred absolute temperature
C. Room temperature
D. Absolute temperature

87. Small voltages generated by a conductor with current in an external magnetic field.
A. Skin effect
B. Magnetic effect
C. Hall effect
D. Flywheel Effect

88. The emission of electrons from hot bodies is called
A. Radiation effect
B. Edison effect
C. Skin effect
D. Half effect

89. The ability of a mechanically stressed ferromagnetic wire to recognize rapid switching of magnetization when subjected to a dc magnetic field.
A. Wartheim effect
B. Wiedemann effect
C. Wiegand effect
D. Edison effect

90. An effect which is generally used in the gausameter to measure flux density.
A. Skin effect
B. Magnetic effect
C. Hall effect
D. Flywheel effect

91. The contribution to the ionization in an ionization chamber by electrons liberated from the walls.
A. Skin effect
B. Walt effect
C. Hall effect
D. Edison effect

92. The tiniest element of matter
A. Atom
B. Proton
C. Electron
D. Neutron

93. All matters (gas, liquid and solid) are composed of
A. Neutrons
B. Particles
C. Electrons
D. Atoms

94. The simplest type of atom to exist is the ______ atom.
A. Helium
B. Hydrogen
C. Boron
D. Oxygen

95. What revolves about the positive nucleus in a definite orbit?
A. Atom
B. Proton
C. Electron
D. Neutron

96. The uncharged particles which have no effect on its atomic charge.
A. Nucleons
B. Electrons
C. Protons
D. Neutrons

97. The diameter of a hydrogen atom is approximately ______ cm.
A. 1.1 x 10^-6
B. 1.1 x 10^-7
C. 1.1 x 10^-8
D. 1.1 x 10^-9

98. The K shell or the first shell has how many permissible number of orbiting electrons?
A. 1
B. 2
C. 3
D. 4

99. Germanium atom has ______ protons and ______ electrons.
A. 32, 32
B. 32, 42
C. 42, 32
D. 34, 34

100. A germanium atom has an atomic weight of 72. How many neutrons are there?
A. 32
B. 40
C. 34
D. 36

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