Electricity and Magnetism Fundamentals MCQs
101. How many neutrons does a copper atom have?
A. 32
B. 33
C. 34
D. 29
Answer: 34
102. Bonding of atoms that is due to the force of attraction between positive ions and a group of negative ions
A. Ionic bond
B. Covalent Bond
C. Electrostatic Bond
D. Metallic bond
Answer: Metallic bond
103. An alloy of 22 percent iron and 78 per cent nickel.
A. Permalloy
B. Alnico
C. Constantan
D. Manganin
Answer: Permalloy
104. An alloy of 40 percent iron and 60 percent nickel.
A. Alnico
B. Permalloy
C. Hipernik
D. Manganin
Answer: Hipernik
105. A commercial alloy of aluminum nickel, and iron with cobalt, copper and titanium added to produce about 12 grades.
A. Alnico
B. Brass
C. Aluminum
D. Constantan
Answer: Alnico
106. The idea of preventing one component from affecting another through their common electric and magnetic field is referred to as
A. Hall effect
B. Grounding
C. Shielding
D. Limiting
Answer: Shielding
107. The physical motion resulting from the forces of magnetic fields is called
A. Motor action
B. Rotation
C. Repulsion
D. Torque action
Answer: Motor action
108. Flux linkages equals
A. Flux times area of core
B. Flux times number of turns times area of core
C. Flux times number of turns times length of core
D. Flux times number of turns
Answer: Flux times number of turns
109. Which of the following is a vector quantity?
A. Magnetic potential
B. Magnetic field intensity
C. Magnetic permeability
D. Flux density
Answer: Magnetic field intensity
110. Which of the following electric quantities is vector in character?
A. Field
B. Charge
C. Energy
D. Potential Difference
Answer: Field
111. The quantity 106 Maxwell's is equivalent to one
A. Weber
B. Gauss
C. Gilbert
D. Tesla
Answer: Weber
112. What is the unit of reluctance?
A. Maxwell
B. Gauss
C. At/Wb
D. Weber
Answer: At/Wb
113. What is the SI unit of magnetic flux?
A. Tesla
B. Weber
C. Maxwell
D. Gauss
Answer: Weber
114. What is the unit of magnetomotive force?
A. Volt
B. Tesla
C. Ampere - turn
D. Weber
Answer: Ampere - turn
115. What is the cgs unit of magnetomotive force?
A. Gilbert
B. Ampere- turn
C. Maxwell
D. Weber
Answer: Gilbert
116. The unit of flux is _____ in cgs system.
A. Tesla
B. Gilbert
C. Maxwell
D. Oersted
Answer: Maxwell
117. Flux density is measured in
A. Tesla
B. Weber
C. Ampere- turn
D. Maxwell
Answer: Tesla
118. The customary energy unit in atomic and nuclear physics is
A. Joule
B. Volt- coulomb
C. electron-volt
D. Walt- second
Answer: electron-volt
119. One ampere- turn is equivalent to _____ gilberts
A. 1.16
B. 1.26
C. 1.36
D. 1.46
Answer: 1.26
120. The magnetic flux of 2000 lines is how many Maxwells?
A. 1000
B. 2000
C. 4000
D. 8000
Answer: 2000
121. How much is the flux in Weber in the above problem?
A. 2 x 10-5
B. 2 x 10-3
C. 2 x 105
D. 2 x 103
Answer: 2 x 10-5
122. One oersted (Oe) is equivalent to _____ Gb/cm.
A. 1
B. 10
C. 100
D. 1000
Answer: 1
123. One electron volt (1 eV) is equivalent to _____ joules
A. 1.3 x 10-19
B. 1.4 x 10-19
C. 1.5 x 10-19
D. 1.6 x 10-19
Answer: 1.6 x 10-19
124. An electron- volt (eV) is a unit of
A. Energy
B. Potential difference
C. Charge
D. Momentum
Answer: Energy
125. The unit of electrical energy is
A. Joule
B. Watt- second
C. Kilowatt- hour
D. All of these
Answer: All of these
126. Electrons at the outer shell are called
A. Outer shell electrons
B. Inner shell electrons
C. Semiconductor electrons
D. Valence electrons
Answer: Valence electrons
127. Which of the following has the least number of valence electrons?
A. Conductor
B. Semiconductor
C. Insulator
D. Semi- insulator
Answer: Conductor
128. A good conductor has how many valence electrons?
A. 1
B. 4
C. 2
D. 8
Answer: 1
129. Which element has four valence electrons?
A. Conductor
B. Insulator
C. Semiconductor
D. Semi- insulator
Answer: Semiconductor
130. A negative ion results when an atom gains an additional
A. Electron
B. Proton
C. Neutron
D. Atom
Answer: Electron
131. An atom or a group of atoms that carries a net electric charge.
A. Positive ion
B. Negative ion
C. Ion
D. Electron
Answer: Ion
132. Hysteresis refers to the ______ between flux density of the material and the magnetizing force applied.
A. Leading effect
B. Ratio
C. Equality
D. Lagging effect
Answer: Lagging effect
133. Hydrogen is an example of a _____ material.
A. Paramagnetic
B. Diamagnetic
C. Ferromagnetic
D. Non- magnetic
Answer: Diamagnetic
134. Cobalt is an example of a ______ material.
A. Paramagnetic
B. Diamagnetic
C. Ferromagnetic
D. Non- magnetic
Answer: Ferromagnetic
135. The evaporation of electrons from a heated surface is called
A. Radiation
B. Convection
C. Thermionic emission
D. Conduction
Answer: Thermionic emission
136. Electron is a Greek word for
A. amber
B. Fire
C. Stone
D. Heat
Answer: amber
137. Gases whose particles are charged are known as
A. Conductors
B. Insulators
C. Gaseous Conductors
D. Plasma
Answer: Plasma
138. What principle states that each electron in an atom must have a different set of quantum numbers?
A. Inclusion principle
B. Exclusion principle
C. Quantum principle
D. Electron principle
Answer: Exclusion principle
139. The energy stored in an electrostatic field or electromagnetic field is called
A. Electromagnetic energy
B. Kinetic energy
C. Potential energy
D. Rest energy
Answer: Potential energy
140. Which of the following statements is TRUE?
A. Silicon dioxide is a good
B. The current carriers in conductors are valence electrons
C. For conductors, the valence electron are strongly attracted to the nucleus
D. The valence electrons are located in the nucleus of an atom
Answer: The current carriers in conductors are valence electrons
141. How many electrons are needed in the valence orbit to give a material’s stability?
A. 8
B. 4
C. 6
D. 5
Answer: 8
142. Residual magnetism refers to the flux density, which exists in the iron core when the magnetic field intensity is
A. Minimized
B. Reduced to zero
C. Maximize
D. Unity
Answer: Reduced to zero
143. Magnetic intensity is a
A. Phasor quantity
B. Physical quantity
C. Scalar quantity
D. Vector quantity
Answer: Vector quantity
144. The core of a magnetic equipment uses a magnetic material with
A. Least permeability
B. Low permeability
C. Moderate permeability
D. High permeability
Answer: High permeability
145. Which of the following is a paramagnetic material?
A. Carbon
B. Copper
C. Bismuth
D. Oxygen
Answer: Oxygen
146. The permeability of permalloy is
A. Very much greater than permeability of air
B. Slightly greater than permeability of air
C. Slightly less than permeability of air
D. Equal to the permeability of air
Answer: Very much greater than permeability of air
147. A t/m is a unit of
A. Mmf
B. Emf
C. Reluctance
D. Magnetizing force
Answer: Magnetizing force
148. The force between two magnetic poles is _____ their poles strength.
A. equal to
B. directly proportional to
C. inversely proportional to
D. directly proportional to the square root of
Answer: directly proportional to
149. The magnetic energy stored in an inductor is ______ current.
A. Directly proportional to
B. Inversely proportional to
C. Directly proportional to the square of
D. Inversely proportional to the square of
Answer: Directly proportional to the square of
150. One of the common application of an air- cored choke.
A. Radio frequency
B. Audio frequency
C. Power supply
D. Power transformer
Answer: Radio frequency
