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# MCQ in Electricity and Magnetism Fundamentals Part 2 | ECE Board Exam

This is the Multiple Choice Questions Part 2 of the Series in Electricity and Magnetism Fundamentals as one of the Electronics Engineering topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including but not limited to past Board Exam Questions in Electronics Engineering field, Electronics Books, Journals and other Electronics References.

#### MCQ Topic Outline included in ECE Board Exam Syllabi

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

#### Continue Practice Exam Test Questions Part 2 of the Series

Choose the letter of the best answer in each questions.

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

A. Relative permeability

B. Relative permittivity

C. Relative conductivity

D. Relative reluctivity

Solution:

52. Permeance is analogous to

A. Conductance

B. Reluctance

D. Resistance

Solution:

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

Solution:

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

Solution:

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

Solution:

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

Solution:

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

Solution:

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

Solution:

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

Solution:

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

Solution:

61. The lagging effect between flux density of the material and the magnetizing force applied

A. Permeance

B. Eddy current

C. Hysteresis

D. Reluctance

Solution:

62. Refers to the magnetic lines

A. Flux

B. Hysteresis

C. Current

D. Magnetomotive force

Solution:

63. Refers to the non- metallic materials that have the ferromagnetic properties of iron.

A. Ferrites

B. Ferromagnetic

C. Diamagnetic

D. Paramagnetic

Solution:

64. The air space between poles of magnets

A. Air gap

B. Free space

C. Vacuum

D. Atmosphere

Solution:

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

Solution:

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

Solution:

67. Used to maintain strength of magnetic field

A. Container

B. Air gap

C. Keeper

D. Source

Solution:

68. All magnetic field originates from

A. moving electric charge

B. Iron atoms

C. Magnetic domain

D. Permanent magnets

Solution:

69. Magnetic fields do not interact with

A. Moving permanent magnets

B. Stationary permanent magnets

C. Moving electric charges

D. Stationary electric charges

Solution:

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

Solution:

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

Solution:

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

Solution:

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

Solution:

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

Solution:

75. A current if flowing east along a power line. If the earthโs field is neglected, the direction of the magnetic field below it is

A. North

B. South

C. East

D. West

Solution:

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

Solution:

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

Solution:

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

Solution:

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

Solution:

80. Steel is hard to magnetize because of its

A. Low permeability

B. High permeability

C. High density

D. High retentivity

Solution:

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

Solution:

82. A group of magnetically aligned atoms is called

A. Range

B. Lattice

C. Domain

D. Crystal

Solution:

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

Solution:

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

Solution:

85. _________ is an electromagnet with its core in the form of a close magnetic ring.

A. Solenoid

B. Paraboloid

C. Toroid

D. Cycloid

Solution:

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

Solution:

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

Solution:

88. The emission of electrons from hot bodies is called

B. Edison effect

C. Skin effect

D. Half effect

Solution:

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

Solution:

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

Solution:

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

Solution:

92. The tiniest element of matter

A. Atom

B. Proton

C. Electron

D. Neutron

Solution:

93. All matters (gas, liquid and solid) are composed of

A. Neutrons

B. Particles

C. Electrons

D. Atoms

Solution:

94. The simplest type of atom to exist is the ____________ atom.

A. Helium

B. Hydrogen

C. Boron

D. Oxygen

Solution:

95. What revolves about the positive nucleus in a definite orbit?

A. Atom

B. Proton

C. Electron

D. Neutron

Solution:

96. The uncharged particles which have no effect on its atomic charge.

A. Nucleons

B. Electrons

C. Protons

D. Neutrons

Solution:

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

Solution:

98. The K shell or the first shell has how many permissible number of orbiting electrons?

A. 1

B. 2

C. 3

D. 4

Solution:

99. Germanium atom has ______ protons and ______ electrons.

A. 32, 32

B. 32, 42

C. 42, 32

D. 34, 34

Solution:

100. A germanium atom has an atomic weight of 72. How many neutrons are there?

A. 32

B. 40

C. 34

D. 36

Solution:

#### Questions and Answers in Electricity and Magnetism Fundamentals

Following is the list of multiple choice questions in this brand new series:
MCQ in Electricity and Magnetism Fundamentals
PART 1: MCQ from Number 1 โ 50                        Answer key: PART 1
PART 2: MCQ from Number 51 โ 100                   Answer key: PART 2
PART 3: MCQ from Number 101 โ 150                 Answer key: PART 3
PART 4: MCQ from Number 151 โ 200                 Answer key: PART 4
PART 5: MCQ from Number 201 โ 250                 Answer key: PART 5
PART 6: MCQ from Number 251 โ 300                  Answer key: PART 6
PART 7: MCQ from Number 301 โ 350                  Answer key: included
PART 8: MCQ from Number 351 โ 400                  Answer key: included
PART 9: MCQ from Number 401 โ 450                  Answer key: included
PART 10: MCQ from Number 451 โ 500                 Answer key: included

### Complete List of MCQ in Electronics Engineering per topic

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