Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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1.
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An
example of a naturally occurring magnetic rock is a. | lodestone. | c. | limestone. | b. | soapstone. | d. | peastone. | | | | |
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2.
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Magnetically soft substances a. | retain their magnetism longer than
others. | b. | lose their magnetism more easily than
others. | c. | cannot be magnetized easily. | d. | pick up more
iron nails than magnetically hard substances. | | |
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3.
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The
north pole of one magnet will be a. | attracted to the north pole of another
magnet. | b. | attracted to the south pole of the same
magnet. | c. | repelled by the north pole of another
magnet. | d. | repelled by the south pole of another
magnet. | | |
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4.
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Like
magnet poles always a. | repel each other. | b. | attract each
other. | c. | cancel out each other’s magnetic
fields. | d. | point toward the north pole. | | |
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5.
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The
magnetism of a piece of magnetized iron can be weakened by a. | heating the iron
and hammering it. | b. | putting it near a piece of unmagnetized
iron. | c. | bending the iron. | d. | none of the
above. | | |
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6.
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Magnetic force a. | is strongest near a magnet's
poles. | c. | acts at a
distance. | b. | is a field force. | d. | all of the above. | | | | |
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7.
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Which
of the compass needle orientations in the figure above might correctly describe the magnet’s
field at that point?
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8.
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The
strength of the magnetic field a. | decreases as distance from the magnet
decreases. | b. | decreases as distance from the magnet
increases. | c. | increases as distance from the magnet
increases. | d. | remains the same at any distance from a
magnet. | | |
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9.
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Magnetic fields exist a. | near a magnet. | c. | within a magnet. | b. | farther away
from a magnet. | d. | all of the
above. | | | | |
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10.
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What
material was used to make the first compass? a. | lodestone | c. | iron | b. | limestone | d. | steel | | | | |
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11.
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What
instrument is used to trace the direction of a magnetic field? a. | lodestone | c. | compass | b. | limestone | d. | needle | | | | |
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12.
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A
compass needle naturally points toward a. | the geographic North Pole. | c. | Earth's North Magnetic Pole. | b. | the S pole of a
magnet. | d. | all of the
above. | | | | |
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13.
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What
causes a compass needle to point to geographic north? a. | The pole of the
compass is attracted to Earth’s Geographic North Pole. | b. | The compass
needle aligns with Earth’s magnetic field. | c. | The force of
Earth’s rotation causes the needle of the compass to seek the north
pole. | d. | all of the above. | | |
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14.
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Earth’s magnetic poles are located in a. | Canada and
Australia. | b. | Canada and Alaska. | c. | Canada and
Antarctica. | d. | the same positions as the geographic
poles. | | |
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15.
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Magnetic fields are produced by a. | magnetic force. | c. | gravitational force. | b. | electric
currents. | d. | water
currents. | | | | |
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16.
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A
magnetic field around a current-carrying wire forms a. | lines tangent to
the wire. | c. | lines parallel
to the wire. | b. | lines perpendicular to the
wire. | d. | concentric
circles around the wire. | | | | |
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17.
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The
strength of a magnetic field created by current in a wire can be safely increased by a. | increasing the
current in the wire. | c. | using longer
wire. | b. | decreasing the current in the
wire. | d. | wrapping the
wire into a coil. | | | | |
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18.
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The
strength of the magnetic field of a solenoid can be increased by a. | decreasing the
number of loops on the solenoid. | b. | decreasing the current in the
solenoid. | c. | increasing the number of loops on the
solenoid. | d. | increasing the resistance of the
solenoid. | | |
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19.
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The
strength of the magnetic field of a solenoid can be increased by a. | decreasing the
number of loops on the solenoid. | b. | decreasing the current in the
solenoid. | c. | inserting an iron rod through the center of the
solenoid. | d. | inserting a rubber rod through the center of the
solenoid. | | |
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20.
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In a
magnetized substance, the domains a. | are randomly distributed. | b. | line up more
uniformly in one direction. | c. | cancel each other. | d. | can never be
reoriented. | | |
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21.
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Which
orientation characterizes the magnetic domains in an unmagnetized piece of iron? a. | parallel to the
magnetic axis | c. | random | b. | antiparallel to the magnetic
axis | d. | perpendicular to
the magnetic axis | | | | |
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22.
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When
an iron rod is inserted into a solenoid's center, the magnetic field produced by the current in the
loops a. | causes the iron
to return to an unmagnetized state. | b. | forces the domains in the iron out of
alignment. | c. | causes a random orientation of the domains in the
iron. | d. | causes alignment of the domains in the
iron. | | |
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23.
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A
potential difference causes a. | electrons to move from the positive terminal to the negative
terminal of a battery. | b. | electrons to move from the negative terminal to the positive
terminal of a battery. | c. | protons to move from the positive terminal to the negative
terminal of a battery. | d. | protons to move from the negative terminal to the positive
terminal of a battery. | | |
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24.
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Which
of the following contains a commutator? a. | galvanometer | c. | electric motor | b. | transformer | d. | electromagnet | | | | |
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25.
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A
device that converts electric energy into mechanical energy is a(n) a. | generator. | c. | commutator. | b. | electric motor. | d. | transformer. | | | | |
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26.
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An
electric motor and a generator are similar in that both a. | use
electricity. | c. | transform energy
into a different form. | b. | produce mechanical energy. | d. | create energy. | | | | |
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27.
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Pushing a magnet through an electric field requires work. The greater the electric
field, a. | the stronger the
force required to push the magnet through the electric field. | b. | the less the
force required to push the magnet through the electric field. | c. | The less will be
the electromagnetic induction. | d. | the more the loop will rotate. | | |
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28.
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When
a charge moves along or opposite the direction of the magnetic field lines, the magnetic force
is a. | zero. | b. | a maximum. | c. | equal to the
magnetic force when it moves perpendicular to the magnetic field lines. | d. | none of the
above. | | |
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29.
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When
a wire is moving perpendicular to a magnetic field, the force on the charges is a. | at a
minimum. | c. | zero. | b. | at a maximum. | d. | all of the above. | | | | |
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30.
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Generators convert a. | mechanical energy to electrical
energy. | b. | electrical energy to mechanical
energy. | c. | chemical energy to electrical energy. | d. | electrical
energy to chemical energy. | | |
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31.
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In an
AC generator, the magnitude of the current produced a. | depends on the
orientation of the loop in a magnetic field. | b. | is a minimum
when the loop is perpendicular to the magnetic field. | c. | varies with
time. | d. | all of the above. | | |
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32.
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In an
AC generator, when charges experience the maximum magnetic force, a. | the current is
small. | c. | the current is
zero. | b. | the current is large. | d. | the current increases. | | | | |
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33.
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When
a wire is moving parallel to a magnetic field, a. | no current is induced in the wire. | b. | maximum current
is induced in the wire. | c. | the same current is induced as if it were perpendicular to the
field. | d. | an alternating current is induced. | | |
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34.
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Light
travels as a. | electrical
waves. | c. | electromagnetic
waves. | b. | magnetic waves. | d. | electrochemical waves. | | | | |
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35.
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Both
electric and magnetic fields in an electromagnetic wave are a. | perpendicular to
the direction that the wave travels. | b. | parallel to the direction that the wave
travels. | c. | opposite the direction that the wave
travels. | d. | tangential to the direction that the wave
travels. | | |
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36.
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Transformers can a. | increase voltage. | c. | neither increase nor decrease
voltage. | b. | decrease voltage. | d. | increase or decrease voltage. | | | | |
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37.
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A
transformer changes a. | both the amperage and the voltage of an electric
current. | b. | the voltage of an electric current. | c. | the amperage of
an electric current. | d. | the type of an electric current. | | |
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