Physics Test 18A
 
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Physics Test 18A

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 

A _____ transformer is used near homes to achieve a voltage of 120 V.
a.
step-up
c.
primary-coil
b.
step-down
d.
secondary-coil
 

 2. 

A transverse wave containing perpendicular electrical and magnetic fields is called a(n)
a.
electromagnetic wave.
c.
AC wave.
b.
electric wave.
d.
solar wave.
 

 3. 

The north pole of one magnet will be
a.
attracted to the north pole of another magnet.
b.
repelled by the center of another magnet.
c.
repelled by the north pole of another magnet.
d.
repelled by the south pole of another magnet.
 

 4. 

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
 

 5. 


mc005-1.jpg

Which of the compass needle orientations in the figure above might correctly describe the magnet’s field at that point?
a.
a
c.
c
b.
b
d.
d
 

 6. 

What instrument is used to trace the direction of a magnetic field?
a.
lodestone
c.
compass
b.
limestone
d.
transformer
 

 7. 

What material was used to make the first compass?
a.
lodestone
c.
iron
b.
limestone
d.
steel
 

 8. 

Magnetic fields are produced by
a.
electric charges.
c.
gravitational force.
b.
electric currents.
d.
water currents.
 

 9. 

Groups of atoms that align to form small, magnetized regions in a material are
a.
geographic domains.
c.
magnetic domains.
b.
magnetic field lines.
d.
magnetic poles.
 

 10. 

A device that converts electrical energy into mechanical energy is a(n)
a.
generator.
c.
commutator.
b.
electric motor.
d.
transformer.
 

 11. 

In an AC generator, the magnitude of the current produced
a.
depends on the orientation of the loop in a magnetic field.
b.
is zero when the loop is perpendicular to the magnetic field.
c.
varies with time.
d.
All of the above
 

 12. 

Light travels as
a.
electrical waves.
c.
electromagnetic waves.
b.
magnetic waves.
d.
electrochemical waves.
 

 13. 

A transformer changes
a.
both the amperage and the voltage of AC current.
b.
the voltage of AC current.
c.
the amperage of AC current.
d.
the resistance of AC current.
 

 14. 

Like magnetic poles always
a.
repel each other.
c.
point toward the south pole.
b.
attract each other.
d.
point toward the north pole.
 

 15. 

An example of a naturally occurring magnetic rock is
a.
lodestone.
c.
limestone.
b.
soapstone.
d.
peastone.
 

 16. 

The strength of the magnetic field of a magnet
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.
 

 17. 

A compass needle naturally points toward
a.
the geographic North Pole.
c.
Earth’s magnetic north pole.
b.
the S pole of a magnet.
d.
All of the above
 

 18. 

Earth’s magnetic poles are located in
a.
Canada and Australia
b.
Canada and Alaska.
c.
Canada and Antarctica.
d.
the same places as the geographic poles.
 

 19. 

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.
 

 20. 

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.
 

 21. 

When a magnetic field is applied near iron, the iron’s domains
a.
scatter and decrease the iron’s magnetic field.
b.
align and increase the iron’s magnetic field.
c.
scatter and increase the iron’s magnetic field.
d.
align and decrease the iron’s magnetic field.
 

 22. 

When the loop of wire in an AC generator rotates halfway,
a.
the current reverses direction.
b.
the current continues in the same direction.
c.
electrical energy is converted into mechanical energy.
d.
maximum current is reached.
 

 23. 

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.
 

 24. 

Transformers can
a.
increase voltage.
c.
decrease voltage.
b.
neither increase nor decrease voltage.
d.
increase nor decrease voltage.
 

Matching
 
 
Match each item with the correct statement below.
a.
electromagnetic induction
d.
generator
b.
transformer
e.
step-down
c.
step-up
f.
alternating current
 

 25. 

a machine that converts mechanical energy into electrical energy
 

 26. 

a transformer with fewer loops on the secondary coil than the primary coil
 

 27. 

the process of creating a current in a circuit by changing a magnetic field
 

 28. 

an electric current that changes direction at regular intervals
 

 29. 

a device that increases or decreases AC current voltage
 

 30. 

a transformer with more loops on the secondary coil than the primary coil
 



 
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