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Unit 6 Test Review - (Circuits and Electromagnets)

Total questions: 60

Worksheet time: 46mins

Name
Class
Date
1.
How are electromagnets different from magnets?
a)
magnets can be turned on/off
b)
you can turn an electromagnet on/off
c)
magnets are more powerful
d)
magnets have a North and South pole
2.
What is the metal center of an electromagnet called?
a)
The current
b)
the wire
c)
the coil
d)
the core
3.
What is this?
a)
magnet
b)
electromagnet
c)
series circuit
d)
parallel circuit
4.
How do you make an electromagnet stronger?
a)
Add a motor and/or lightbulbs
b)
Add more light bulbs and/or wire coils
c)
add more wire coils and/or a switch
d)
add more wire coils and/or batteries
5.
This is a picture of a simple electromagnet. How can the electromagnet be made stronger?
a)
Add more coils of wire to the nail.
b)
Use a smaller battery.
c)
Reverse the poles of the magnet.
d)
Remove all the coils and the nail.
6.
What does a loudspeaker use to turn electric energy into sound?
a)
a permanent magnet
b)
an extension cord
c)
an electromagnet
d)
a series circut
7.

Which of the following is NOT needed for an electromagnet?

a)

Wire

b)

Iron core (like a bolt)

c)

Switch

d)

Power source

8.

Using more coils increases the strength of the electromagnet.

a)

true

b)

false

9.
Surrounding every magnet is a __________  __________.
a)
magnetic field
b)
electrical current
c)
another magnet
d)
an enemy
10.
In order for an electromagnet to be formed, an __________ current must pass through a coil of __________ wrapped around an ________ core.
a)
wire, iron, electric
b)
electric, wire, iron
c)
iron, electric, wire
d)
excited, hair, apple
11.
What is one difference between electromagnets and bar magnets?
a)
Bar magnets can be turned off but electromagnets cannot
b)
Electromagnets need electricity but bar magnets do not
c)
Bar magnets have a magnetic field but electromagnets do not
d)
Bar magnets are bigger than electromagnets
12.
How can you reverse a magnetic field in a circuit?
a)
Connect the battery the other way around
b)
Use a different wire
c)
Increase the current
d)
Use a different battery
13.
What is the function of a switch in an electric circuit?
a)
To allow electrons to flow through the circuit
b)
To allow heat to flow through the circuit
c)
To allow chemicals to flow through the circuit
d)
To produce electricity
14.

What is the name given to the force pushing the flow of electrons? (Like pressure in a hose)

a)

Voltage

b)

Current

c)

Resistance

d)

Power

15.
Which is an advantage of a parallel circuit over a series circuit?
a)
If one bulb goes out, the other stays lit.
b)
The bulbs get dimmer as you add more.
c)
If one bulb goes out, all go out.
d)
It is prettier.
16.
How is voltage measured?
a)
Volts
b)
Ohms
c)
Amps
d)
Watts
17.
How is resistance measured?
a)
Volts
b)
Amps
c)
Ohms
d)
Watts
18.
Will this configuration of a complete circuit light a bulb?
a)
yes
b)
no
19.
Will this configuration of a complete circuit and light a bulb?
a)
yes
b)
no
20.
This circuit has a battery, buzzer, and switch.
When the switch is closed the buzzer will sound because -
a)
the switch gives energy to the battery
b)
the buzzer is made of special plastic
c)
the wires are cooled by the surrounding air
d)
electricity can flow in a complete path
21.
When all parts of the circuit are connected it is a ______ circuit. 
a)
open
b)
closed
22.
The flow of electrical energy starts at the  ___ side of the d-cell.
a)
negative
b)
positve
c)
complete circuit
d)
bulb
23.
Which subatomic particle has a negative charge?
a)
Proton
b)
Neutron
c)
Electron
24.
What is the relationship between electrical current and magnetic field strength in an electromagnet?
a)
When current is increased, magnetic field strength increases
b)
When current is increased the strength of magnetic field decreases
25.
this is the symbol for a _____?
a)
switch
b)
light 
c)
battery
d)
wires
26.

what is this symbol for?

a)

light bulb

b)

single cell battery

c)

double cell battery

d)

resistor

27.
This is the symbol for a ...
a)
Wire
b)
Battery
c)
Buzzer
d)
Fuse
28.
This is the symbol for 
a)
An Ammeter
b)
A Voltmeter
c)
A Meter
d)
A Motor
29.
This is the symbol for a _____?
a)
Lamp
b)
Water wheel
c)
Loudspeaker
d)
Motor
30.
a)
Closed switch
b)
Push switch
c)
Trap door
d)
AC Power supply
31.

What is the following symbol represent?

a)

Wire

b)

Resistor

c)

Battery

d)

Switch

32.
The picture shows an electrical circuit. This circuit is a series circuit because: 
a)
It has 3 light bulbs.
b)
The same current flows through all three light bulbs.
c)
It uses a single battery.
d)
The electrical current is divided between the three light bulbs.
33.
Which of the two circuits would have the brightest bulbs? 
a)
A
b)
B
34.
What kind of circuit is this?
a)
series
b)
parallel
35.
In a parallel circuit if one of the light bulbs burns out the rest _________.
a)
stop the flow of electricity
b)
 can still light up
c)
 will go out
d)
of the light bulbs burn out also
36.
If one light goes out in a parallel circuit what will happen to the rest?
a)
None will go out
b)
All will go out
c)
Two or more will go out
d)
They will look for a conductor
37.
Which one uses less wire? 
a)
Parallel circuit 
b)
Series Circuit 
38.
Which of the following answer choices correctly describes the image? 
a)
Series circuit - Bulbs are lit
b)
Series circuit - Bulbs are off
c)
Parallel circuit - Bulbs are lit
d)
Parallel circuit - Bulbs are off
39.
Pick the correct sentence.
a)
This circuit will work because it is a closed circuit.
b)
Energy will freely flow in this circuit.
c)
This circuit will not work because there is no energy source.
d)
This circuit will not work because there is no switch.
40.

Levi is wanting to light a bulb. What does he need to get the bulb to light?

a)

A battery and a conductor

b)

A battery and a plastic fork

c)

A paper clip and a wire

d)

A switch and a wire

41.
a)
Bulbs are in parallel - Circuit X is brighter than Circuit Y
b)
Bulbs are in parallel - Circuit Y is brighter than Circuit X
c)
Bulbs are in series - Circuit X is brighter than Circuit Y
d)
Bulbs are in series - Circuit Y is brighter than Circuit X
42.

This circuit does not work because…

a)

the bulbs are not connected properly

b)

two battery cells are not powerful enough

c)

there is a break in the circuit

d)

the battery cells are facing each other (- to -)

43.
This circuit does not work because…
a)
the bulbs are not connected properly
b)
the single cell is not powerful enough
c)
there is a break in the circuit
d)
there is a short crcuit
44.
a)
all bulbs are lit equally
b)
the two top bulbs are brighter
c)
the single lower bulb is brighter
d)
the single bulb does not light and the other two are dim
45.
A class prepared some electrical circuits using battery, connecting wires, and three light bulbs.  Which of these circuits can make the three bulbs light?
a)
A
b)
B
c)
C
d)
D
46.
Amy and Grayson have built a series circuit using a battery, some copper wire, and three light bulbs.  What should happen to the brightness of the light bulbs if they add another light bulb to the circuit?
a)
Nothing; the four bulbs will remain as bright as the original three bulbs.
b)
The fourth bulb will be dimmer, and the first bulb will be brightest.
c)
The four bulbs will be brighter than the original three bulbs.
d)
The four bulbs will be dimmer than the original three bulbs.
47.
Will has built a circuit with a single 1.5 V battery connected in series to three light bulbs.  The light bulbs are not as bright as he would like.  What can he do to make them burn more brightly?
a)
add a fourth light bulb in series
b)
connect a second battery in parallel
c)
connect a second battery in series
d)
A and C only
48.
Increasing the current applied to an electromagnet will affect which of the following?
a)
the voltage delivered by the electromagnet
b)
the magnetic field exerted by the electromagnet
c)
the mass of the electromagnet
d)
the nuclear force delivered by the electromagnet
49.
Electromagnet            Number of wire loops
R                                 80
S                                 120
T                                 100
U                                 115  
Each letter represents an electromagnet with the number of its wire loops listed beside it.  Which electromagnet will attract or repel a bar magnet with the greatest force?

a)
R
b)
S
c)
T
d)
U
50.
The flow of electricity through a circuit can be compared to the flow of water through a pipe.  Using this comparison, the friction caused by the pipe wall would be similar to 
a)
the resistance of the circuit.
b)
the amperage of the circuit.
c)
the voltage of the circuit.
d)
the coulombs in the circuit.
51.
Electricity is the flow of _________.
a)
Protons
b)
Neutrons
c)
Electrons
52.
Why would a magnet attract a paperclip but not a penny?
a)
Magnets only attract to silver objects
b)
magnets are not attracted to all kinds of metal.
c)
Magnets do not attract to round objects
d)
Magnets do not attract to objects that are orange. 
53.
What measures the flow of electrons from one place to the next?
a)
Parallel Circuit
b)
Current
54.
Label the circuit
a)
closed circuit
b)
complete circuit
c)
incomplete circuit
d)
working circuit
55.

An electric current is traveling in a wire. A compass is placed under the wire with the current flowing from north to south. In response, the compass needle will-

a)

rotate because of a magnetic force that acts on the needle

b)

rotate because of an electric force that acts on the needle

c)

not move because moving electric charges do not exert magnetic forces on the needle

d)

not move because moving electric charges do not exert electric forces on the needle

56.

An electric current flows in a wire. What is one result?

a)

a magnetic field is created

b)

any nearby magnetic fields are destroyed

c)

nearby magnets lose their strength

d)

the metal of the wire cannot be affected by magnets

57.

Dave notices that a wire is magnetic and attracts metal objects, What can be concluded about the wire?

a)

an electric current is passing through it

b)

heat is passing through it

c)

radiation is passing through it

d)

sound waves are passing through it

58.

How are the two forces that make up electromagnetic forces related?

a)

both are static

b)

both can be positive, negative, or neutral

c)

both the electric and magnetic forces are caused by the motion of charged particles such as electrons

d)

both gravity and light are caused by the motion of charged particles such as electrons

59.

Which switch, when opened, will make the light go out?

a)

Q

b)

R

c)

S

d)

T

60.

Which circuit will not light the bulb?

a)
b)
c)
d)

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