Electricity and Magnetism Fundamentals - MCQs Part II

Multiple Choice Questions Topic Outline

• MCQs in Atomic Structure
• MCQs in Electric Charge
• MCQs in Ohm's Law, Kirchoff Law, Coulomb's Law, etc
• MCQs in Magnetic Power
• MCQs in Magnetic Field and Magnetic Flux
• MCQs in Magnetic and Electric Quantities / Units
• MCQs in Magnetic/Electromagnet Principles

The Six-Parts Series

Following is the list of multiple choice questions in this brand new series:

Electricity and Magnetism Fundamentals MCQs

PART 1: MCQs from Number 1 – 50                        Answer key: PART I

PART  2: MCQs from Number 51 – 100                   Answer key: PART II

PART 3: MCQs from Number 101 – 150                  Answer key: PART III

PART 4: MCQs from Number 151 – 200                  Answer key: PART IV

PART 5: MCQs from Number 201 – 250                  Answer key: PART V

PART 6: MCQs from Number 251 – 300                  Answer key: PART VI

Start with Part II of the MCQs Series

51. The ratio of the permeability of material to the permiabiity of air or vacuum.

• A. Relative permeability
• B. Relative permittivity
• 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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