Multiple Choice
Identify the choice that best completes the
statement or answers the question.
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1.
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The resistance in a wire decreases as its diameter
a. | increases. | c. | remains the same. | b. | decreases. | d. | none of the
above |
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2.
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If a DC circuit is
a. | in series, the currents are different for each component (e.g.,
resistors). | b. | in series, the voltages are the same for each component. | c. | in parallel, the
currents are equal for all paths of the circuit. | d. | in parallel, the voltages are equal for all
paths of the circuit. |
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3.
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Current is
a. | time/charge. | c. | (charge)(time). | b. | charge/time. | d. | charge/time2. |
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4.
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Ohm's law is mathematically described as
a. | C = Q/V. | c. | R = V/I. | b. | L = -V/It. | d. | V =
I2R. |
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5.
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A volt is a measure of
a. | random drift velocity. | c. | current. | b. | flow rate. | d. | potential
difference. |
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6.
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A charge would lose most of its energy when it passes through a
a. | resistor. | c. | generator. | b. | battery. | d. | all of the
above |
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7.
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If the distance between two electrical charges is doubled, the force between
them is
a. | decreased by ?. | c. | Doubled. | b. | decreased by ?. | d. | Quadrupled. |
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8.
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If a conductor is positively charged, it
a. | has too many electrons. | c. | has more neutrons than
electrons. | b. | is deficient in electrons. | d. | is deficient in protons. |
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9.
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Electrons move southward in a vertical wire. The direction of the associated
magnetic field directly around the wire is
a. | clockwise. | b. | counterclockwise. | c. | in the direction of
the electron flow. | d. | opposite to the conventional
current. |
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10.
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A rectifier
a. | refers to a type of electromagnetic device. | b. | refers to a type of
electromechanical device. | c. | converts DC to AC. | d. | converts AC to
DC. |
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11.
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American generators operate at
a. | 220 V. | c. | 60 Hz. | b. | 120 AC. | d. | 30 A. |
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12.
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Electrification occurs through the movement of
a. | only protons. | b. | protons and electrons. | c. | only
electrons. | d. | electrons and neutrons. |
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13.
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A ____ is a source of direct current.
a. | wall socket | b. | battery | c. | generator | d. | spark |
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14.
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What is the unit of electric potential?
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15.
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An alternating (AC) current is represented by a ____ line.
a. | sinusoidal | b. | horizontal | c. | vertical | d. | descending |
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16.
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What is Ohm’s Law?
a. | I = V/R | b. | V = I/R | c. | R =
VI | d. | I = VR |
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17.
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A charged particle in motion creates a(n)
a. | negative charge. | b. | positive charge. | c. | magnetic
field. | d. | electrostatic charge. |
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18.
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What is the SI unit of magnetic field strength?
a. | ampere | b. | tesla | c. | dipole | d. | ohm |
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19.
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What type of material can be made magnetic when placed in an external magnetic
field?
a. | diamagnetic | b. | ferromagnetic | c. | paramagnetic | d. | nonmagnetic |
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20.
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Like magnetic poles ____ and unlike magnetic poles ____.
a. | attract, attract | b. | repel, repel | c. | repel,
attract | d. | attract, repel |
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21.
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Faraday’s experiments proved that a current could be induced by a magnetic
field only if the field is
a. | stationary. | b. | changing. | c. | motionless. | d. | vibrating. |
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22.
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A coil of wire placed between two poles of a magnet with a strong magnetic field
would be an ____.
a. | autotransformer | b. | induction motor | c. | electric
motor | d. | electric generator |
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23.
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A commutator ring is used to change ____ current to ____ current in an electric
generator.
a. | alternating, amplified | b. | direct, amplified | c. | alternating,
direct | d. | direct, alternating |
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24.
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Mechanical motion produces electric current in the ____.
a. | electromagnet | b. | electric motor | c. | electric
transformer | d. | electric generator |
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25.
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A transformer converts
a. | mechanical energy to electrical energy. | b. | electrical potential
to higher or lower intensity. | c. | electrical energy to mechanical
energy. | d. | mechanical energy to magnetic fields. |
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