WorksheetsUnit 7 Lessons 3, 4, & 5 Quiz Review
Total questions: 20
Worksheet time: 10mins
Name
Class
Date
1.
Mr. Smith warned his students not to have hair dryers plugged in near a bathtub full of water because of the risk of electric shock. What type of material is water?
a)
An insulator that does not allow charges to move easily
b)
A conductor that allows charges to move easily
c)
A semiconductor that can be used to control the flow of a charge
d)
A discharge that rapidly loses charge
2.
The strength of an electric field around two charged objects depends on the amount of charge of each object and
a)
the distance between the objects
b)
the gravitational pull of the objects
c)
the mass of the two objects
d)
the polarity of the two objects
3.
This image shows three pairs of circular objects. Which statement is true about the top two pairs?
a)
The objects in these pairs are moving away from each other because like charges repel.
b)
The objects in these pairs are moving toward each other because like charges repel.
c)
The objects in these pairs are moving away from each other because like charges attract.
d)
The objects in these pairs are moving away from each other because unlike charges repel.
4.
The principle of conservation of charge states that:
a)
Electrons can be destroyed in order to change charges.
b)
Only negatively charged objects have any electrons.
c)
Charging objects involves moving electrons from one object to another.
d)
Electrons can be created in order to change charges.
5.
How do we know that the Earth's geographic north pole is actually the Earth's magnetic south pole?
a)
Compass magnets' north pole points to the geographic north pole, so that must be the magnetic south pole.
b)
Compass magnets can't help us understand Earth's magnetic poles at all.
c)
The geographic north pole is the same as the magnetic north pole, no matter what compass magnets say.
d)
Compass magnets can only work in the western hemisphere.
6.
What is the definition of a domain?
a)
An iron core wrapped inside of a solenoid
b)
A push or a pull created by two magnets
c)
An non-magnetic material such as plastic
d)
Groups of atoms that have aligned north and south poles
7.
A magnetic field is a region around a magnet in which you can measure magnetic forces. At which part(s) of the magnet is the magnetic field strongest?
a)
The poles
b)
The middle
c)
The horseshoe bend
d)
Any part covered in plastic
8.
Industrial electromagnets are useful for picking up some heavy objects. What would objects have to be made of to be attracted to an electromagnet?
a)
Plastic
b)
Silicon
c)
Iron
d)
Rubber
9.
Which of the following devices uses a simple magnet?
a)
galvanometer
b)
handheld compass
c)
electric motor
d)
ear bud
10.
An electric buzzer uses an electromagnet to make a loud repetitive sound. A coil of wire is wrapped around a bolt, which is magnetized. It attracts the nail, which moves away from the pop can and breaks the circuit. The nail then snaps back and hits the pop can, making noise. Which statement is true?
a)
When electric current runs through the coil of wire, a magnetic field is generated.
b)
This system shows a transfer of electricity, but not magnetism.
c)
Coils of wire are not usually attracted to magnets.
d)
Currents always cause magnets to gain power.
11.
Electromagnetism is defined as:
a)
the interaction between gravity and magnetism
b)
the interaction between electricity and magnetism
c)
the interaction between gravity and solar power
d)
the interaction between any non-contact forces
12.
A coil of wire (like the one around the nail in this picture) that carries and electric current and therefore produces a magnet field is called a:
a)
solenoid
b)
electromagnet
c)
armature
d)
commutator
13.
An example of electromagnetic induction, or the use of a magnetic field to create an electric current in a wire, would be:
a)
moving a bar magnet in and out of a wire coil
b)
shaking the wire up and down very quickly
c)
connecting the two ends of the wire to a positive and negative battery terminal
d)
pour water all over the wire and hope for the best
14.
What is the function of an electric motor?
a)
To convert mechanical energy into electrical energy
b)
To convert electrical energy into mechanical energy
c)
To convert thermal energy into electrical energy
d)
To convert mechanical energy into thermal energy
15.
The hamster wheel generator pictured has kinetic energy supplied to it when a hamster rotates the wheel. This wheel then spins conductive coils within the magnetic field of the permanent magnets. This motion causes the wires to carry an alternating electric current so when the wheel is turned, the phone charger gets electric current. A generator converts
a)
electrical energy into mechanical (kinetic) energy.
b)
nuclear energy into mechanical (kinetic) energy.
c)
mechanical (kinetic) energy into electrical energy.
d)
electrical energy into nuclear energy.
16.
Electric generators use induction to change mechanical energy intro electrical energy. How do electric generators work?
a)
Electric current makes a magnetic field
b)
Higher voltage is stepped down to lower voltage
c)
A magnet is moved back and forth through a coil of wire
d)
Just plug them in!
17.
The arrows in this diagram represent groups of atoms. What are these groups of atoms called?
a)
Domains
b)
Poles
c)
Ferromagnets
d)
Nuclei
18.
Which figure represents a material that is not magnetized?
a)
Figure A because all of the domains are lined up.
b)
Figure B because the domains are not lined up.
c)
Figure A because the domains are not lined up.
d)
Figure B because all of the domains are lined up.
19.
Gravitational, electric, magnetic, and electromagnetic forces are considered non-contact forces. Which statement is true of all of these non-contact forces?
a)
As distance between objects increases, the force decreases.
b)
As amount of charge of objects increases, the force decreases.
c)
As the amount of iron in the objects increases, the force decreases.
d)
Objects must touch in order to be affected by these forces.
20.
Which of the following is not a property of magnets?
a)
Magnetic forces
b)
Magnetic poles
c)
Magnetic fields
d)
Magnetic metals
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