Physical Science

Chapter 8: Magnetism and Its Uses

Standardized Test Practice

1.
Which of the following describes the direction of the electric current in DC?
A)The flow changes regularly.
B)The flow changes irregularly.
C)The flow shows no pattern.
D)The flow is in one direction.
2.
Which of the following elements is a magnetic material?
A)aluminum
B)copper
C)tin
D)nickel
3.
The primary coil (plug end) has twenty turns and the secondary coil (light) has two turns. What is the voltage at the lamp?

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A)15 V
B)120 V
C)12 V
D)1200 V
4.
The primary coil (plug end) has twenty turns and the secondary coil (light) has two turns. What is the current at the lamp?

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A)12 A
B)15 A
C)96 A
D)1.5 A
5.
What is the energy conversion? provided by a generator?
A)chemical to electrical
B)mechanical to thermal
C)mechanical to electrical
D)thermal to electrical
6.
The magnetic field of an electromagnet can be increased by
A)changing the direction of the current.
B)decreasing the current.
C)increasing the number of coils.
D)decreasing the number of coils.
7.
In a stereo system, the energy conversion of the speakers is
A)electrical energy to mechanical energy.
B)electrical energy to magnetic energy.
C)electrical energy to thermal energy.
D)electrical energy to potential energy.
8.
What does this illustration represent?

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A)magnetic material that is not magnetized
B)magnetic material that is magnetized
C)non-magnetic material
D)arrangement of atoms in a domain
9.
In this illustration, the magnetic field is strongest _______.

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A)near either pole
B)near the north pole
C)near the south pole
D)halfway between the poles
10.
If the students doing this experiment used 25 turns of wire on the input side of their transformer, how many turns did they use on the output side? (Art: 622_STP Questions_ta04)
A)10
B)5
C)25
D)125
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