Physical Science: Electricity and Magnetism, Book N

Chapter 2: Magnetism

Magnetism

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