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Unit 9 REview

Total questions: 140

Worksheet time: 3hrs 38mins

Name
Class
Date
1.

an object that attracts iron and other materials that have magnetic qualities similar to iron

a)

magnet

b)

copper

c)

aluminum

d)

metal

2.

the place on a magnet where the force it exerts is the strongest (what is a magnetic pole?)

a)

the ends of the magnet

b)

center of the magnet

c)

outer edge of the magnet

d)

inside of the magnet

3.

A (a)   is the invisible region around a charged object where noncontact forces like electricity, magnetism, and gravity are applied.

4.

If a circuit is complete and electric energy flows through the circuit then it's called ​a (a)   . If a circuit is not complete and no electric energy flows through the circuit then it's called a ​ (b)   . The flow of electricity (which is caused by charged particles) is called a ​ (c)   . The measurement of the potential energy is known as ​ (d)   .

Choose from the below words
closed circuit
open circuit
current
voltage
circuit
5.

a magnet created by wrapping a current-carrying wire around a ferromagnetic core

a)

electromagnet

b)

electric motor

c)

electric generator

d)

electromagnetism

6.

a device that uses a magnetic field to transfer mechanical energy to electric energy

a)

electromagnet

b)

electric motor

c)

electric generator

d)

electromagnetism

7.

a device that uses an electric current to produce motion

a)

electromagnet

b)

electric motor

c)

electric generator

d)

electromagnetism

8.

Which object(s) have electric fields?

a)

Electric Charges

b)

Magnets

c)

Both Electric Charges & Magnets

d)

Electric fields do not exist

9.

Which object(s) have magnetic fields?

a)

Electric Charges

b)

Magnets

c)

Both Electric Charges & Magnets

d)

Magnetic fields do not exist

10.

A(n) ___ converts electricity into magnetism.

a)

electric transformer

b)

electric generator

c)

electromagnet

d)

electric motor

11.

A(n) ___ converts magnetism into electricity.

a)

electric transformer

b)

electric generator

c)

electromagnet

d)

electric motor

12.

A(n) ___ converts electricity into magnetism, and back to electricity.

a)

electric transformer

b)

electric generator

c)

electromagnet

d)

electric motor

13.

Electric charges must ___ in order to create an observable magnetic field.

a)

exist

b)

be moving

c)

be stationary

d)

disappear

14.

Which of the following will increase the strength of an electromagnet?

a)

Use a Bigger Battery (More Current)

b)

Wrap More Coils

c)

Insert an Iron Core

d)

Use a Bigger Magnet

15.

Which of the following will increase the strength of an electric generator?

a)

Use a Bigger Magnet

b)

Move the Magnet Slower

c)

Wrap More Coils

d)

Use a Bigger Battery

16.

A(n) ___ electric current will create a changing magnetic field.

a)

existing

b)

direct

c)

alternating

d)

stable

17.

The ___ coils a wire has the ___ current is able to be generated.

a)

more; more

b)

less; more

c)

more; less

d)

less; less

18.
A compass points north because of the Earth's ________ field?
a)
electrical
b)
gravitational
c)
magnetic
d)
static
19.
What is the area around an object that can attract or repel other objects in that area?
a)
Magnetic Field
b)
Magnetic Fission
c)
Force
d)
Friction
20.
Magnetic fields are created by _______ electric charges.
a)
only positive
b)
only negative
c)
moving
d)
static
21.
Which of these metals is NOT attracted to a magnet?
a)
Aluminum
b)
Cobalt
c)
Iron
d)
Nickel
22.
Which of these metals is NOT attracted to a magnet?
a)
Aluminum
b)
Cobalt
c)
Iron
d)
Nickel
23.
Electric fields are created by _____ electric charges.
a)
only positive
b)
only negative
c)
moving
d)
static
24.
Which type of charge would be attracted to a positively charged object?
a)
Only positive
b)
Only negative
c)
Both
d)
Neither
25.
Electric fields are usually created when _____ are transferred between objects.
a)
protons
b)
neutrons
c)
electrons
d)
positrons
26.
How can you INCREASE the strength of an electromagnet?
a)
Use more coils
b)
Use less coils
c)
Decrease the amount of electricity
d)
Make the wire thinner
27.

Which of the following is true about the magnetic field formed inside the solenoid? (choose all applicable)

a)

It points from left to right.

b)

It points from right to left.

c)

The left side of the solenoid is the north pole.

d)

The right side of the solenoid is the north pole.

28.

Which two are true about the electromagnet?

a)

The magnetic field points down (-y) inside the nail.

b)

The magnetic field points up (+y) inside the nail.

c)

The paperclips are attached to the north pole.

d)

The paperclips are attached to the south pole.

29.

what is a solenoid?

a)

a wire carrying a current

b)

a magnet eating pizza

c)

a current carrying coiled wire

30.
What would happen if I move a bar magnet in and out of a coil of copper wire?
a)
Electric current would disappear 
b)
The magnet would explode 
c)
Electric current will flow through the wire
d)
It would produce a gravitational field
31.
The strength of a magnet can be changed by
a)
adding less loops to the coil.
b)
adding more loops to the coil.
32.
The strength of an electromagnet can be affected by
a)
changing the current in the wire
b)
changing the space between the wires
c)
all of the above
d)
none of the above
33.
An example of the best insulator is
a)
copper
b)
salt
c)
plastic
d)
sand
34.
An example of a good conductor is
a)
copper
b)
sand
c)
plastic
35.
The coil of current-carrying wire with an iron core is called a(n)
a)
ferromagnet
b)
electromagnet
c)
compass
d)
maglev
36.
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.
37.
What kind of magnet can be turned on and off?
a)
refridgerator magnet
b)
electromagnet
c)
magnetite
d)
iron
38.
Surrounding every magnet is a __________  __________.
a)
magnetic field
b)
electrical current
c)
another magnet
d)
an enemy
39.
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
40.
What is most likely to happen when the switch is closed?
a)
A magnetic field should be produced
b)
The nail will rust
c)
The battery will explode
d)
The wire will catch on fire
41.
What is most likely to happen when the switch is closed?
a)
A magnetic field should be produced
b)
The nail will rust
c)
The battery will explode
d)
The wire will catch on fire
42.
Why are paper clips attracted to magnets?
a)
They contain silver.
b)
They contain aluminum
c)
They contain tin.
d)
They contain iron. 
43.

A flow of electric charge

a)

Electric Circuit

b)

Electric Current

c)

Static Electricity

d)

Electricity

44.

A closed path along which an electric charge can flow.

a)

Electric Circuit

b)

Electric Current

c)

Static Electricity

d)

Electricity

45.

An energy source often used in a circuit.

a)

the sun

b)

a windmill

c)

gas

d)

a battery

46.

In a solid, the moving electric charges are called​ (a)   .​

Choose from the below words
electrons
protons
neutrons
47.

On the top of most batteries, electrons go in the ​ (a)   terminal and out of ​the (b)   terminal at the bottom.

Choose from the below words
positive
negative
neutral
equal
48.

Match the following

a)
1.

wire

b)
2.

light bulb

c)
3.

battery

d)
4.

switch

e)
5.

electric circuit

49.

A​ (a)   is a complete electrical path. An ​ (b)   is an electrical path that is not complete.

Choose from the below words
closed circuit
open circuit
open current
closed current
50.

A​ (a)   is a complete electrical path. An ​ (b)   is an electrical path that is not complete.

Choose from the below words
closed circuit
open circuit
open current
closed current
51.

What is the purpose of a switch in an electric circuit?

a)

to change the direction of the current

b)

to provide a "push" to electrons

c)

to allow the circuit to be opened or closed

d)

to increase power to the light bulb

52.

A circuit contains a battery, a wire, a switch, and a bulb. What would happen if you removed the battery?

a)

The current would not flow.

b)

The current would flow faster

c)

The bulb would glow more brightly

d)

The bulb would glow less brightly

53.

Theo makes a circuit using a battery, a wire, a switch, and two bulbs. One of the bulbs then burns out. Which of the following will MOST LIKELY happen?

a)

The good bulb will glow more brightly

b)

The good bulb will glow less brightly

c)

The brightness of the bulb will not change

d)

The good bulb will also stop shining

54.
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.
55.
What will happen if one light bulb is removed from this circuit?
a)
The other bulbs will go out.
b)
The other bulbs will stay on
c)
The other bulbs will get dimmer.
d)
The battery will become stronger.
56.
Does this diagram represent a series or parallel circuit?
a)
series circuit
b)
parallel circuit
57.
Would would best complete this circuit?
a)
A wire
b)
A switch
c)
A battery
d)
A light bulb
58.

Will this circuit light the bulbs?

a)

Yes, both will light up

b)

Yes, but only the one on the right

c)

Yes, but only one on the left

d)

No, neither of the bulbs will light up

59.

How many paths does a series circuit have?

a)

4

b)

3

c)

2

d)

1

60.
What will happen if one light bulb is removed from this circuit?
a)
The other bulbs will go out.
b)
The other bulbs will stay on
c)
The other bulbs will get dimmer.
d)
The battery will become stronger.
61.
What kind of circuit is this?
a)
Series
b)
Consecutive
c)
Parallel
d)
Training
62.
What kind of circuit is this?
a)
series
b)
parallel
63.
If I add more light bulbs to a series circuit what happens?
a)
The current speeds up and the lights get brighter
b)
The current slows down and the lights dim lower
c)
The current speeds up and the lights dim lower
d)
The current slows down and the lights get brighter
64.
Which one will still function if one light bulb goes out?
a)
A-Series
b)
B-Parallel
c)
A-Parallel
d)
B-Seriese
65.
Which circuit (s) are parallel?
a)
A
b)
A and B
c)
B and C
d)
C
66.
What slows down the flow of electricity in a circuit?
a)
resistance
b)
voltage
c)
current
d)
source of electric current
67.
The best conductors for electricity are made of...
a)
wood
b)
plastic
c)
rubber
d)
metal
68.
The force that pushes the electricity through a circuit is called...
a)
resistance
b)
voltage
c)
current
d)
switch
69.
The flow of electricity through a conductor is called...
a)
resistance
b)
voltage
c)
current
d)
source of electric current
70.
This circuit won't work. What essential part is missing from this circuit?
a)
resistance
b)
source of electric current
c)
conductor
d)
ammeter
71.

Why is electrical wiring usually are covered with a layer of plastic?

a)

To make it look pretty

b)

To help electricity flow along the wire

c)

To make it safe

d)

To add more energy

72.

Why is electrical wiring usually made from copper?

a)

Because copper is shiny

b)

Because copper conducts electricity

c)

Because copper is not magnetic

d)

Because copper insulate electricity

73.

Which of the following materials is an electrical conductor?

a)

Plastic spoon

b)

Silver-colored plastic spoon

c)

copper spoon

d)

wooden spoon

74.

A material that does NOT let electricity pass through it is called ...

a)

An electrical conductor

b)

An electrical insulator

c)

An electrical source

d)

An electric appliance

75.

What is a circuit with several paths for electricity to flow?

a)

conductor

b)

series circuit

c)

parallel circuit

d)

open circuit

76.

What is a circuit that only has ONE path for electricity to flow?

a)

series circuit

b)

closed circuit

c)

parallel circuit

d)

light bulb

77.
An incomplete circuit is shown.
To complete the circuit, a wire should be placed from —
a)
Point D to Point C
b)
Point B to Point C
c)
Point A to Point D
d)
Point B to Point D
78.
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
79.
Which of the following can work as an energy source?
a)
Battery
b)
Light bulb
c)
Wire
d)
All of them
80.
Choose the correct sentence.
a)
This circuit will work because it is an open circuit.
b)
This circuit will work because it is a closed circuit.
c)
This circuit will NOT work because it is an open circuit.
d)
This circuit will NOT work because it is a closed circuit.
81.
What is an electrical circuit?
a)
lets you turn the energy on and off
b)
a closed path where where electricity flows
c)
stop electricity from flowing through
82.
A complete circuit has .......
a)
a motor in it
b)
a switch in it
c)
two bulbs in it
d)
no breaks in it
83.
A student began building a circuit to light a bulb.  What else does the student need to produce light?
a)
a battery that has energy
b)
a wire that is insulated
c)
a switch that is open
d)
another bulb of the same size
84.
What kind of circuit is this?
a)
Series
b)
Consecutive
c)
Parallel
d)
Training
85.
Which is NOT true of a series circuit
a)
One light bulb can be broken and other lights will still work.
b)
All loads are a single loop
c)
Adding more loads will lessen the current in the loop
86.
The type of circuit used in your home is a _______ circuit.
a)
series
b)
parallel
87.
Which of these objects is an insulator?
a)
Copper Wire
b)
Paper Clip
c)
Steel Pole
d)
Rubber Gloves
88.
An object through which electrons can easily flow is called a(n) ___________.
a)
Conductor
b)
Insulator
89.

The build up of an electrical charge on the surface of an object is called

a)

electricity

b)

static electricity

c)

power lines

d)

electrons

90.

What charge does an electron have?

a)

positive

b)

negative

c)

no charge

91.

Which is not an example of electrons moving from one object to another?

a)

Walking across the carpet

b)

Rubbing a balloon on your hair

c)

Waving your hand in the air

92.

When an object LOSES electrons, that object

a)

becomes positively charged

b)

becomes negatively charged

c)

loses its charge

93.

When an object GAINS electrons, that object

a)

becomes positively charged

b)

becomes negatively charged

c)

loses its charge

94.
Static electricity is:
a)
electricity flowing in a wire
b)
the buildup of electric charges on an object
c)
when protons move between objects
95.
Two objects with LIKE static charges will
a)
attract each other
b)
even out in the end
c)
repel each other
d)
cause a spark
96.
Which is an example of static dischage?
a)
a motor
b)
lightning
c)
thunder
d)
insulators
97.
Static charges build up when
a)
protons move within an object
b)
electrons move within an object
c)
neutrons move within an object
d)
the nucleus moves within an object
98.
Is it possible to CREATE electrons?
a)
Yes, that's what static electricity is.
b)
No, you can move them, but they are never created or distroyed.
c)
Sometimes, it depends on the voltage.
d)
Sometimes, it depends on the element.
99.
If two objects with static charge are attracted, what do you know about them?
a)
They are both positively charged.
b)
They are both negatively charged.
c)
One is positively charged and one is negatively charged, but you won't be able to tell which is which.
d)
One is positively charged and one is negatively charged, and you can tell which is which by looking at them.
100.
Rubbing a balloon on hair is an example of static charge build up created by....
a)
conduction
b)
friction
c)
induction
d)
hairduction
101.
True or False:
In static electricity, charges build up on an object, but they do not flow continuously.
a)
True
b)
False
c)
11
d)
Tuesday
102.

Electricity happens with the flow of

a)

electrons.

b)

water

c)

sand

103.

Electricity does not flow well through insulators. A good example of an insulator is _________________.

a)

plastic

b)

metal

104.

When you get shocked by touching a doorknob, that's an example of ___________________.

a)

static electricity

b)

an electrial circuit

105.

Static electricity is when_________________

a)

electrons jump from one thing to another.

b)

magic happens.

106.

Static electricity is when_________________

a)

electrons jump from one thing to another.

b)

magic happens.

107.
If you rub a glass rod with a piece of silk, the rod becomes positively charged. This means that
a)
friction destroyed electrons in the rod.
b)
the silk has become negatively charged.
c)
protons have moved to the rod.
d)
glass attracts more protons.
108.

The accumulation of excess electric charge on an object is called

a)

Static electricity

b)

Electric discharge

c)

Resistance

d)

Current electricity

109.

Mr. Anady rubbed two balloons against his wool sweater for 30 seconds each. What will happen when the balloons are brought near each other?

a)

The balloons will repel each other.

b)

The balloons will attract each other.

c)

The balloons will become positively (+) charged.

d)

The balloons will pop.

110.
Which of the following is caused by static electricity?
a)
a stove getting hot when it is turned on
b)
a magnet being attracted to a refrigerator
c)
a lightning strike during a storm
d)
a light bulb coming on when a switch is turned on
111.

What is the unit of measurement for resistance?

a)

Voltage

b)

Ampere

c)

Watts

d)

Ohms

112.
What is Resistance?
a)
the degree to which a circuit component opposes the passage of an electric current, causing energy dissipation
b)
How hard the energy is pushed
c)
The amount of charges that pass by a given point per second
d)
None of the above
113.

Which of the following has this circuit symbol?

a)

diode

b)

fixed resistor

c)

filament lamp

114.

What is the function of a diode?

a)

To block electricity

b)

To produce sound

c)

To make sure current flows in one direction

d)

To make sure voltage flows in one direction

115.

What happens if the diode is in forward-biased mode?

a)

Current can flow

b)

Current cannot flow

c)

Voltage can flow

d)

Voltage cannot flow

116.

a motor converts electrical current into

a)

chemical energy

b)

chemical force

c)

mechanical force

d)

mechanical life

117.

electric current can cause a magnetic field

a)

true

b)

false

118.

electric current can cause a magnetic field

a)

true

b)

false

119.

what year did Michael Faraday discover electro magnetic induction

a)

1831

b)

1925

c)

1879

d)

1931

120.

what is electromagnetic induction

a)

when you induce magnets

b)

when you use chemicals to make science

c)

the ability to use an electrical current to create a magnetic field and vise versa

d)

the ability to use an magnetic field to create an electrical current and vise versa

121.

what are generators

a)

powers people

b)

powers the world

c)

a thing that can power anything

d)

a apparatus for producing gas, steam , or another substance

122.

how can you make electro magnet

a)

string, pencil, wire

b)

battery, nail, string

c)

battery, nail, wire

d)

battery, pencil, wire

123.

what device is made of coils of wire with an electrical current in order to generate magnetic field

a)

magnet

b)

electron magnet

c)

electrons

d)

electromagnet

124.

Which statement best explains the flow of energy through a motor?

a)

battery-->electrical current-->copper wire rotor -->magnet--> mechanical energy

b)

battery--> magnet--> electrical current--> copper wire rotor--> mechanical energy

c)

magnet--> mechanical energy--> copper wire rotor--> battery--> electrical current

d)

magnet--> copper wire rotor--> mechanical energy--> battery--> electrical current

125.
If I were to try to connect the north pole of one magnet to the south pole of another magnet, the two poles would:
a)
attract
b)
repel
c)
neither
d)
flip
126.
If I were to try to connect the north pole of one magnet to the north pole of another magnet, the two poles would:
a)
attract
b)
repel
c)
neither
d)
flip
127.

What is the energy transfer in a generator?

a)

Mechanical to Electrical

b)

Physical to Potential

c)

Electrical to Mechanical

d)

Yogurt to Light

128.

electric generators converts mechanical force into

a)

mechanical energy

b)

magmatism

c)

electric current

d)

electric energy

129.

Which best describes how a motor works?

a)

When a fan blows on a wire, it causes it to spin, creating a force.

b)

When a fan blows on a wire, it causes it to spin, creating an electrical current.

c)

When a wire that carries electrical current is placed in zero gravity, the wire experiences a force.

d)

When a wire that carries electrical current is placed in a magnetic field, the wire experiences a force.

130.

Which statement best explains the flow of energy through a motor?

a)

battery-->electrical current-->copper wire rotor -->magnet--> mechanical energy

b)

battery--> magnet--> electrical current--> copper wire rotor--> mechanical energy

c)

magnet--> mechanical energy--> copper wire rotor--> battery--> electrical current

d)

magnet--> copper wire rotor--> mechanical energy--> battery--> electrical current

131.

Which of the following are true for motors? Select all that apply.

a)

Motors transform electrical energy into mechanical energy.

b)

Motors contain an electromagnet that spins between a permanent magnet.

c)

Motors transform chemical energy into electrical energy.

d)

A motor spins due to the attraction and repulsion of magnets.

132.
Which of these pairs of devices operate in reverse of each other?
a)
generator and motor
b)
generator and electromagnet
c)
motor and electromagnet
d)
electromagnet and resistor
133.

Which of the following are true for motors? Select all that apply.

a)

Motors transform electrical energy into mechanical energy.

b)

Motors contain an electromagnet that spins between a permanent magnet.

c)

Motors transform chemical energy into electrical energy.

d)

A motor spins due to the attraction and repulsion of magnets.

134.
Which of these pairs of devices operate in reverse of each other?
a)
generator and motor
b)
generator and electromagnet
c)
motor and electromagnet
d)
electromagnet and resistor
135.

A generator converts mechanical energy to electrical energy. What could be done to make the lamp brighter?

a)

change the polarity of the magnets

b)

turn the coil slower

c)

turn the coil faster

d)

decrease the size of the magnets

136.

A generator converts mechanical energy to electrical energy. What could be done to make the lamp brighter?

a)

change the polarity of the magnets

b)

turn the coil slower

c)

turn the coil faster

d)

decrease the size of the magnets

137.

A generator converts mechanical energy to electrical energy. What could be done to make the lamp brighter?

a)

change the polarity of the magnets

b)

turn the coil slower

c)

turn the coil faster

d)

decrease the size of the magnets

138.

In a simple electric generator, a conducting loop of wire is placed in a magnetic field. The loop of wire is then rotated. Why is it necessary for the wire to be rotated?

a)

Its motion through the air transforms heat into magnetism.

b)

Its motion removes the magnetic field by using up the magnetic energy.

c)

Its motion when it moves upward changes gravity into magnetism.

d)

Its motion through the magnetic field creates a current in the wire.

139.

Many bicycles have generators that have a light that can be powered without a battery. Currently, no electric current is flowing through the circuit shown. What needs to happen to cause an electric current to flow through the circuit?

a)

A smaller wire needs to be used.

b)

A bigger light bulb needs to be used.

c)

The magnet's north pole needs to point up.

d)

The magnet needs to be in constant motion.

140.

A _________ circuit has multiple pathways for current to flow

a)

Series Circuit

b)

Open Circuit

c)

Combination Circuit

d)

Parallel Circuit

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