Indiana Science Grade 8

Chapter 11: Magnetism

Magnetism

1.
The interaction between two magnets is called __________.
A)a magnetic field
B)current
C)magnetic force
D)polarity
2.
Iron is a magnetic material, but an iron nail does not behave like a magnet because __________.
A)its magnetic domains are arranged randomly
B)the atoms in the iron exert a force on all the other atoms
C)it contains too few magnetic domains
D)its magnetic domains are aligned
3.
Which of the following statements about Earth's magnetic field is true?
A)When molten rock cools, the iron in it no longer contains magnetic domains.
B)It is possible for Earth's magnetic field to reverse.
C)Earth's magnetic field extends about 10 m above Earth's surface.
D)A magnetic pole is permanent but a geographic pole is not.
4.
What is the most common type of power plant?
A)nuclear
B)wind power
C)hydroelectric
D)coal burning
5.
Which of the following is found in all magnets?
A)an electrical field
B)a transformer
C)a geographic pole
D)a north pole and a south pole
6.
Magnetic fields that surround all magnets exert __________.
A)resistance
B)electric current
C)the magnetic force
D)air pressure
7.
North poles of magnets always attract __________.
A)south poles
B)other north poles
C)positive charges
D)negative charges
8.
Magnetic fields are created by __________.
A)spinning neutrons
B)moving electric charges
C)potential energy of molecules
D)magnetic field lines
9.
__________ flows in only one direction through a wire.
A)Alternating current
B)Direct current
C)Voltage
D)Electric current
10.
Magnetic field lines that curve away from each other show __________.
A)a magnetic domain
B)where the magnetic field is strongest
C)attraction
D)repulsion
11.
Alternating current changes the __________ of the current flow.
A)direction
B)amount
C)voltage
D)strength
12.
What is responsible for generating Earth's magnetic field?
A)Earth's revolution
B)solar wind streaming toward Earth
C)the Moon's strong gravitational pull on Earth
D)movement of iron in the core
13.
The negatively charged particles in an atom are called __________.
A)negatrons
B)electrons
C)protons
D)neutrons
14.
The input coil of a step-up transformer has 10 turns and its output coil has 100 turns. What is the voltage in the output coil if the input voltage is 50 V?
A)500 V
B)5500 V
C)160 V
D)4500 V
15.
The magnetic field that surrounds Earth is called the __________ .
A)magnetron
B)magnetosphere
C)magnetic domain
D)magnetic polar region
16.
Electric current should pass through a __________ after being transmitted by a power plant and before it enters your home.
A)step-up transformer
B)turbine
C)step-down transformer
D)generator
17.
Which of the following devices produces electric current?
A)compass
B)generator
C)motor
D)electric fan
18.
Electric current passing through a wire produces __________.
A)geographic poles
B)a magnetic field around the wire
C)a compass
D)a permanent magnet
19.
Which of the following devices can increase or decrease the voltage of an alternating current?
A)motor
B)transformer
C)battery
D)generator
20.
The __________ are regions where the magnetic force exerted by a magnet is strongest.
A)magnetic poles
B)cathodes
C)magnetic field lines
D)anodes
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