Electricity and Magnetism Fundamentals - MCQs Part III

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 III of the MCQs Series

101. How many neutrons does a copper atom have?

• A. 32
• B. 33
• C. 34
• D. 29

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

103. An alloy of 22 percent iron and 78 per cent nickel.

• A. Permalloy
• B. Alnico
• C. Constantan
• D. Manganin

104. An alloy of 40 percent iron and 60 percent nickel.

• A. Alnico
• B. Permalloy
• C. Hipernik
• D. Manganin

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

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

107. The physical motion resulting from the forces of magnetic fields is called

• A. Motor action
• B. Rotation
• C. Repulsion
• D. Torque 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

109. Which of the following is a vector quantity?

• A. Magnetic potential
• B. Magnetic field intensity
• C. Magnetic permeability
• D. Flux density

110. Which of the following electric quantities is vector in character?

• A. Field
• B. Charge
• C. Energy
• D. Potential Difference

111. The quantity 10⁶ maxwells is equivalent to one

• A. Weber
• B. Gauss
• C. Gilbert
• D. Tesla

112. What is the unit of reluctance?

• A. Maxwell
• B. Gauss
• C. At/Wb
• D. Weber

113. What is the SI unit of magnetic flux?

• A. Tesla
• B. Weber
• C. Maxwell
• D. Gauss

114. What is the unit of magnetomotive force?

• A. Volt
• B. Tesla
• C. Ampere - turn
• D. Weber

115. What is the cgs unit of magnetomotive force?

• A. Gilbert
• B. Ampere- turn
• C. Maxwell
• D. Weber

116. The unit of flux is _____ in cgs system.

• A. Tesla
• B. Gilbert
• C. Maxwell
• D. Oersted

117. Flux density is measured in

• A. Tesla
• B. Weber
• C. Ampere- turn
• D. Maxwell

118. The customary energy unit in atomic and nuclear physics is

• A. Joule
• B. Volt- coulomb
• C. electron-volt
• D. Walt- second

119. One ampere- turn is equivalent to _____ gilberts

• A. 1.16
• B. 1.26
• C. 1.36
• D. 1.46

120. The magnetic flux of 2000 lines is how many Maxwells?

• A. 1000
• B. 2000
• C. 4000
• D. 8000

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

122. One oersted (Oe) is equivalent to _____ Gb/cm.

• A. 1
• B. 10
• C. 100
• D. 1000

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

124. An electron- volt (eV) is a unit of

• A. Energy
• B. Potential difference
• C. Charge
• D. Momentum

125. The unit of electrical energy is

• A. Joule
• B. Watt- second
• C. Kilowatt- hour
• D. 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

127. Which of the following has the least number of valence electrons?

• A. Conductor
• B. Semiconductor
• C. Insulator
• D. Semi- insulator

128. A good conductor has how many valence electrons?

• A. 1
• B. 4
• C. 2
• D. 8

129. Which element has four valence electrons?

• A. Conductor
• B. Insulator
• C. Semiconductor
• D. Semi- insulator

130. A negative ion results when an atom gains an additional

• A. Electron
• B. Proton
• C. Neutron
• D. Atom

131. An atom or a group of atoms that carries a net electric charge.

• A. Positive ion
• B. Negative ion
• C. Ion
• D. Electron

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

133. Hydrogen is an example of a _____ material.

• A. Paramagnetic
• B. Diamagnetic
• C. Ferromagnetic
• D. Non- magnetic

134. Cobalt is an example of a ______ material.

• A. Paramagnetic
• B. Diamagnetic
• C. Ferromagnetic
• D. Non- magnetic

135. The evaporation of electrons from a heated surface is called

• A. Radiation
• B. Convection
• C. Thermionic emission
• D. Conduction

136. Electron is a Greek word for

• A. amber
• B. Fire
• C. Stone
• D. Heat

137. Gases whose particles are charged are known as

• A. Conductors
• B. Insulators
• C. Gaseous Conductors
• D. 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

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

40. 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

141. How many electrons are needed in the valence orbit to give a material’s stability?

• A. 8
• B. 4
• C. 6
• D. 5

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

143. Magnetic intensity is a

• A. Phasor quantity
• B. Physical quantity
• C. Scalar quantity
• D. 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

145. Which of the following is a paramagnetic material?

• A. Carbon
• B. Copper
• C. Bismuth
• D. 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

147. A t/m is a unit of

• A. Mmf
• B. Emf
• C. Reluctance
• D. 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

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

150. One of the common application of an air- cored choke.

• A. Radio frequency
• B. Audio frequency
• C. Power supply
• D. Power transformer

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