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UNIT 5 Magnets, Electricity and Electromagnetics/Force Fields

Total questions: 137

Worksheet time: 2hrs 40mins

Name
Class
Date
1.
Magnetic field lines are closet together at the __________.
a)
poles
b)
lines
2.
Magnetic field lines are closet together at the __________.
a)
poles
b)
lines
3.
The motion of liquid _______ in the Earth's core creates a magnetic field.
a)
Iron
b)
Magnesium
4.
A(n) __________ is a device that has a magnetized needle that can spin freely.
a)
Compass
b)
Magnetic Field
5.
repel
a)
to push objects away from each other
b)
to provide evidence that goes against a claim
c)
an object, diagram, or computer program that helps us
d)
when two objects come close together
6.
Where is the force of attraction the strongest on a magnet?
a)
at the poles
b)
in the middle
c)
above the magnet
d)
below the magnet
7.
magnetic field
a)
the space around a magnet in which magnetic forces can act on objects
b)
to separate or set apart
c)
one of the two opposite ends of a magnet
d)
to provide evidence that goes against a claim
8.
Attract
a)
To pull objects close to each other
b)
to push objects away from each other
c)
to change from one type to another
d)
an electric current 
9.

Which of the two below result in an attractive force?

a)

A positive charge and a negative charge

b)

Two negative charges

c)

Two south poles

d)

A north pole and a south pole

e)

Two postive charges

10.

Static electricity is the buildup of charges between two objects. What best explains why a balloon is attracted to hair when the two have been rubbed together?

a)

The balloon and hair both have positive charges

b)

The balloon and the hair both have negative charges

c)

The balloon and the hair both have neutral charges

d)

The balloon and the hair both have opposite charges

11.

Which of the following most closely resembles an electromagnetic?

a)
b)
c)
d)
12.

Two bar magnets are held close together. They are released and allowed to move freely. The bar magnets quickly come together. Which best explains why this happens?

a)

The poles facing one another are both south poles

b)

The poles facing one another are both north poles

c)

The poles facing one another are opposite poles

d)

One magnet was bigger than the other

13.

Frederick sets paper clips out on a table. He then takes a magnet, places it directly beneath the paper clips under the table, and moves the magnet. He finds that the paper clips move with the magnet. Why does this happen?

a)

Magnetic force is a repellant force

b)

Magnetic forces act on wood, like in the table

c)

The paper clips are feeling the gravitational force of the magnet

d)

Magnetic forces act at a distance, even betwewn objects

14.

Surrounding each magnetic is an invisible force field called

a)

Gravity

b)

A magnetic field

c)

An electric field

d)

The Force

15.

In an electromagnet, coils of wire are wrapped around a magnetic object to generate a magnetic field. What the is relationship between number of coils and the strength of the magnetic field?

a)

The more coils an electromagntic has, the stronger the magnetic field

b)

The more coils an electromagntic has, the weaker the magnetic field

c)

The larger the metal object, the stronger the magnetic field is

d)

There is no relationship between number of coils and the strength of a magnetic field

16.

To decrease the strength of a magnetic field around an electromagnet, we must

a)

increase the number of coils

b)

increase the size of the iron core

c)

decrease the size of the iron core

d)

decrease the number of coils

17.

What is the cause of electricity?

a)

Magnetism

b)

Gravity

c)

Moving electrons

d)

Lightning

18.

The charge on the left is ____ and the charge on the right is ___

a)

positive ; positive

b)

negative ; negative

c)

negative ; positive

d)

positive ; negative

19.
When two magnets repel, they ________________
a)
change color
b)
pull together
c)
push apart
d)
get colder
20.

Which object(s) have electric fields?

a)

Electric Charges

b)

Magnets

c)

Both Electric Charges & Magnets

d)

Electric fields do not exist

21.

Which object(s) have magnetic fields?

a)

Electric Charges

b)

Magnets

c)

Both Electric Charges & Magnets

d)

Magnetic fields do not exist

22.

A(n) ___ converts electricity into magnetism.

a)

electric transformer

b)

electric generator

c)

electromagnet

d)

electric motor

23.

A(n) ___ converts magnetism into electricity.

a)

electric transformer

b)

electric generator

c)

electromagnet

d)

electric motor

24.

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

a)

electric transformer

b)

electric generator

c)

electromagnet

d)

electric motor

25.

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

a)

exist

b)

be moving

c)

be stationary

d)

disappear

26.

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

27.

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

28.

Why is permanent magnet able to exert a force on an electric charge?

a)

Electric charges have an electric field

b)

Electric charges have a magnetic field

c)

A permanent magnet has an electric field

d)

A permanent magnet cannot exert a force on an electric charge

29.

What must occur for a magnetic field to induce an electric current?

a)

The magnetic field must be really big

b)

The magnetic field must be stable

c)

The magnetic field must be changing

d)

The magnetic field must be from a permanent magnet

30.

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

a)

existing

b)

direct

c)

alternating

d)

stable

31.

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

a)

more; more

b)

less; more

c)

more; less

d)

less; less

32.

Atoms that have a positive charge will be ATTRACTED to atoms with a ___________ charge.

a)

positive

b)

negative

c)

neutral

33.

Which of these forces works only by combining electric and magnetic forces?

a)

Magnetic

b)

Electric

c)

Electromagnetism

34.

This force occurs when ions/atoms create attractive and repulsive forces.

a)

Magnetic

b)

Electric

c)

Electromagnetism

35.

This force occurs when there is an attractive and repulsive force between two poles.

a)

Magnetic

b)

Electric

c)

Electromagnetism

36.

In a magnet the opposite poles will ___________.

a)

attract

b)

repel

37.

The magnetic field of a magnet is ____________ further away from the magnet.

a)

stronger

b)

weaker

38.

Electric charges that DO NOT move through a current are known as

a)

Magnetic

b)

Electric

c)

Electromagnetism

d)

Static Electricity

39.

What makes an electromagnet stronger?

a)

greater number of loops

b)

smaller number of loops

c)

decreasing the current

d)

decreasing the voltage

40.

An example of an electromagnet

a)

water bottle

b)

paper

c)

motor

d)

glass

41.

current flowing through a wire is surrounded by a/an

a)

force field

b)

magnetic force

c)

nothing

42.

two type of charges in electric and magnetic forces are

a)

north and south

b)

east and west

c)

positive and negative

d)

beyonce

43.

when electrons all spin in the same direction, they create an invisible force known as

a)

electricity

b)

magnetism

c)

motor

d)

electrons

44.

this force is the attractive and repulsive force between two poles.

a)

electric

b)

magnetic

c)

electromagnetic

45.

this force occurs when ions/atoms create attractive and repulsive forces.

a)

electric

b)

magnetic

c)

electromagnetic

46.

electrons have this type of charge

a)

positive

b)

negative

c)

neutral

47.

protons have this type of charge

a)

positive

b)

negative

c)

neutral

48.

when the number of electrons matches the number of protons, the atom's charge is...

a)

positive

b)

negative

c)

neutral

49.

When your hair stands on end, each strand repelling the other, you are experiencing

a)

magnetism

b)

ghosts

c)

static electricity

50.

What is a NON-CONTACT force?

a)

A push or pull force where the objects are not touching

b)

A push force where the objects are touching.

c)

An example would be pulling open a door.

d)

The only type of force that exists in the world.

51.

When two objects are closer to one another, the force of gravity between them ____________.

a)

Increases

b)

Decreases

c)

Stays the same

d)

Divides by a factor of 100

52.

What is the difference between MASS and WEIGHT?

a)

Mass DOES NOT change if the force of gravity changes. Weight DOES change if the force of gravity changes.

b)

Mass DOES change if the force of gravity changes. Weight DOES NOT change if the force of gravity changes.

c)

Mass is related to gravity while weight is not.

d)

If an object is SMALLER, it always has more mass and less weight than a LARGER object.

53.

What are the poles of a magnet called?

a)

East and West Pole

b)

North and East Pole

c)

North and South Pole

d)

Up and Down Pole

54.

If you placed two magnets next to one another, and the NORTH poles were facing one another, what would happen?

a)

The magnets would attract (pull together)

b)

The magnets would repel (push apart)

c)

The magnets would explode.

d)

The magnets would spin out of control.

55.

What are the three NON-CONTACT forces we are studying this unit?

a)

Gravity, friction, air resistance

b)

Forces, motion, human body systems

c)

Friction, electricity, muscular system

d)

Gravity, electricity, and magnetism

56.

What is an EFFECT of STATIC electricity?

a)

Your hand shocks the doorknob as you leave a room.

b)

Your iPad charges overnight when plugged in.

c)

A light bulb lights up when connected to a circuit.

d)

Our school is powered.

57.

The three examples pictured are of

a)

Non-contact Forces

b)

Contact Forces

58.

The force between the phone and the mount is a

a)

contact force

b)

non-contact force

59.
Each non-contact force has an area of influence surrounding it.  What is this area called?
a)
gravitational attraction
b)
influence center
c)
field 
d)
attraction 
60.
The diagram below shows that ______________________.
a)
As distance increases, the electric force increases.
b)
As distance decreases, the objects become less attractive.
c)
Electric forces are only slightly affected by distance.
d)
As distance increases, the electric force decreases.
61.
Which answer best describes this image?
a)
The positive charge is repelling the negative charge.
b)
The blue charged object will repel the negatively red charged object.
c)
The positively charged red object will be attracted to the negatively charged blue object.
62.
If each object has the same mass, which pair has the strongest gravitational attraction?
a)
The first, because it appears to weigh the most.
b)
The first, because the arrows are thickest.
c)
The  second, because it has an even balance of weight and distance.
d)
The first, because the objects are closest together.
63.
Which of the following will not change in different gravitational fields?
a)
weight
b)
force
c)
mass
d)
pounds
64.

When you drop a hammer and a feather, why does the feather fall slower?

a)

air resistance causes the feather to slow down

b)

gravity pulls harder on the hammer than the feather

c)

gravity pulls harder on the feather than the hammer

d)

air resistance causes the hammer to fall slower

65.

Static electricity is a...

a)

Contact Force

b)

Non-Contact Force

66.

Air resistance is a...

a)

Contact Force

b)

Non-Contact Force

67.

Normal force is a...

a)

Contact Force

b)

Non-Contact Force

68.

A contact force is from

a)

objects physically touching

b)

far apart objects

c)

not touching object

d)

always a pull

69.

A non-contact force is between

a)

two objects that aren't touching

b)

two objects that are touching

c)

the ground and wheels

d)

you and me

70.

What is the name of the missing force?

a)

gravity

b)

normal force

c)

applied force

d)

frictional force

71.
What happens when two north poles of a magnet are placed together?
a)
they repel
b)
they attract
c)
they cancel each other out
d)
the strength of the magnet is doubled
72.
Look closely at the magnetic field lines. Will these magnets attract or repel?
a)
Attract
b)
Repel
73.

Looking at the field lines in this picture, these two magnets are ________

a)

Attracting

b)

Repelling

c)

Attracting and Repelling

d)

Doing nothing

74.

These magnets would....

a)

Repel

b)

Attract

75.
What will happen when these magnets are brought close together?
a)
They will attract each other.
b)
They will repel each other.
c)
Both magnets will turn to the left
d)
Both magnets will turn to the right
76.
Look closely at the magnetic field lines. Will these magnets attract or repel?
a)
Attract
b)
Repel
77.

The image above shows how iron filings respond to magnetic fields generated by two magnets with ____________ poles facing each other.

a)

like

b)

opposite

c)

positive

d)

negative

78.

Are these magnets attracting or repelling?

a)

attracting

b)

repelling

79.

The image above shows how iron filings respond to magnetic fields generated by two magnets with ____________ poles facing each other.

a)

opposite

b)

like

c)

positive

d)

negative

80.

Which answer describes the pictures correctly?

a)

Both drawings show attraction of magnetic forces.

b)

The left drawing shows repulsion and the right drawing shows attraction of magnetic forces.

c)

Both drawings show repulsion of magnetic forces.

d)

The left drawing shows attraction and the right drawing shows repulsion of magnetic forces.

81.

What will the magnets in the picture do?

a)

Attract

b)

Repel

c)

Neither attract nor repel

d)

Both attract and repel

82.

What will the magnets in the picture do?

a)

Attract each other

b)

Repel each other

c)

Both attract and repel

d)

Neither attract nor repel

83.

Eli is holding two magnets close to each other. What will happen when he lets go?

a)

The magnets will not move because the magnets are not touching.

b)

The magnets will move closer to each other because the magnetic force will pull the magnets together.

c)

The magnets will move away from each other because the magnets are not touching.

d)

The magnets will move away from each other because the magnetic force will push the magnets apart.

84.

Why does a compass needle point north?

a)

The compass is a bar magnet

b)

Because north is up and you know that up is always north or the stratosphere.

c)

Because it's magic

d)

Because the North end of the compass lines up with the Earth's magnetic south pole

85.

Opposite charges _____ and like charges ____.

a)

attract, repel

b)

repel, attract

86.

Sharona puts two magnetic toy vehicles very close to each other. What will happen next, and why?

a)

The toy vehicles will not move because the magnets are not touching.

b)

The toy vehicles will move closer to each other because the magnetic force will pull the vehicles together.

c)

The toy vehicles will move away from each other because the magnets are not touching.

d)

The toy vehicles will move away from each other because the magnetic force will push the toy vehicles apart.

87.
which two poles attract 
a)
north and south
b)
south and south
c)
north and east
d)
east and west
88.
what can be attracted to magnets?
a)
wood
b)
skin
c)
Metals such as iron, nickel and cobalt
89.
What happens when two north poles of a magnet are placed together?
a)
they repel
b)
they attract
c)
they cancel each other out
d)
the strength of the magnet is doubled
90.
Where is the force of attraction the strongest on a magnet?
a)
at the poles
b)
in the middle
c)
above the magnet
d)
below the magnet
91.
What characteristics do magnetic substances have?
a)
They can give you a "shock" when you touch them
b)
They can push or pull objects without touching them
c)
They are always black and cold to touch
d)
They fall faster than other objects when you drop them
92.
A series circuit has ____ path(s) that the electric current can take. 
a)
One
b)
Two 
c)
Three 
d)
Four
93.
Which of these objects is an insulator?
a)
Copper Wire
b)
Paper Clip
c)
Steel Pole
d)
Rubber Gloves
94.
An object through which electrons can easily flow is called a(n) ___________.
a)
Conductor
b)
Insulator
95.
Which statement is true?
a)
The light bulb will light up because the  circuit is complete.
b)
The light bulb will light up because the  circuit is broken.
c)
The light bulb will not light up because the  circuit is complete.
d)
The light bulb will not light up because the  circuit is broken.
96.
Which one is a conductor? 
a)
wood 
b)
iron 
c)
plastic spoon 
d)
paper 
97.
What is an electromagnet?
a)
a temporary magnet made from current carrying wire around a magnetic metal core.
b)
a permanent magnet with a north and south pole
98.
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.
99.
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
100.
Surrounding every magnet is a __________  __________.
a)
magnetic field
b)
electrical current
c)
another magnet
d)
an enemy
101.
What is the transfer of electricity in a motor?
a)
chemical to mechanical 
b)
electrical to mechanical
c)
mechanical to electrical 
d)
physical to potential 
102.
Which device uses mechanical energy to produce electrical energy?
a)
Electric Motor
b)
Magnet
c)
Generator
d)
Solar Cell
103.

A device that converts electrical energy to mechanical energy is?

a)

Motor

b)

Electromagnet

c)

Generator

d)

Electricity

104.

Which of the two below result in an attractive force?

a)

A positive charge and a negative charge

b)

Two negative charges

c)

Two south poles

d)

A north pole and a south pole

e)

Two postive charges

105.

Static electricity is the buildup of charges between two objects. What best explains why a balloon is attracted to hair when the two have been rubbed together?

a)

The balloon and hair both have positive charges

b)

The balloon and the hair both have negative charges

c)

The balloon and the hair both have neutral charges

d)

The balloon and the hair both have opposite charges

106.

Which of the following most closely resembles an electromagnetic?

a)
b)
c)
d)
107.

Two bar magnets are held close together. They are released and allowed to move freely. The bar magnets quickly come together. Which best explains why this happens?

a)

The poles facing one another are both south poles

b)

The poles facing one another are both north poles

c)

The poles facing one another are opposite poles

d)

One magnet was bigger than the other

108.

Frederick sets paper clips out on a table. He then takes a magnet, places it directly beneath the paper clips under the table, and moves the magnet. He finds that the paper clips move with the magnet. Why does this happen?

a)

Magnetic force is a repellant force

b)

Magnetic forces act on wood, like in the table

c)

The paper clips are feeling the gravitational force of the magnet

d)

Magnetic forces act at a distance, even betwewn objects

109.

Surrounding each magnetic is an invisible force field called

a)

Gravity

b)

A magnetic field

c)

An electric field

d)

The Force

110.

In an electromagnet, coils of wire are wrapped around a magnetic object to generate a magnetic field. What the is relationship between number of coils and the strength of the magnetic field?

a)

The more coils an electromagntic has, the stronger the magnetic field

b)

The more coils an electromagntic has, the weaker the magnetic field

c)

The larger the metal object, the stronger the magnetic field is

d)

There is no relationship between number of coils and the strength of a magnetic field

111.

To decrease the strength of a magnetic field around an electromagnet, we must

a)

increase the number of coils

b)

increase the size of the iron core

c)

decrease the size of the iron core

d)

decrease the number of coils

112.

What is the cause of electricity?

a)

Magnetism

b)

Gravity

c)

Moving electrons

d)

Lightning

113.

A Van der Graff generator works by

a)

Causing the outside of the metal ball to become positively charged

b)

Causing the outside of the metal ball to become neutrally charged

c)

Causing the outside of the metal ball to become a bar magnet

d)

Causing the outside of the metal ball to become negatively charged

114.
What happens when two bar magnets repel each other?
a)
The poles of the magnets pull toward each other.
b)
The poles of the magnets push away from each other.
c)
The centers of the magnets pull toward each other.
d)
The centers o the magnets push away from each other.
115.
Which is not a property of a magnet? 
a)
all magnets have two poles
b)
all magnets have a force of attraction or repulsion
c)
all magnets are surrounded by a magnetic field
d)
all magnets can be turned off
116.
A compass _______ is the part of a compass that is magnetic.
a)
bar
b)
dial
c)
needle
d)
rose
117.
Why are magnetic poles called north and south?
a)
because the needle points up and down
b)
because it lines up with Earth's axis
c)
because magnets help with direrctions
d)
because it sounds cool
118.
What causes electricity?
a)
moving neutrons
b)
moving protons
c)
moving atoms
d)
moving electrons
119.
What type of electricity occurs when you rub a balloon on your sweater?
a)
thermal electricity
b)
current electricity
c)
static electricity
d)
work electricity
120.
What happens when you touch a metal doorknob after rubbing your shoes on the carpet?
a)
 The doorknob sends a burst of electric current into your body
b)
 Millions of electrons go from your finger into the doorknob
c)
The doorknob sends millions of electrons into your finger
d)
Your finger becomes negatively charged
121.
Lightning is a form of static electricity. What can you infer about what happens when lightning strikes the ground?
a)
Protons and neutrons are transferred from the clouds to the ground
b)
The ground becomes negatively charged
c)
. Electrons are transferred from the clouds to the ground
d)
An electric current is established between the clouds and the ground
122.
The movement of electrically charged particles is 
a)
electric current
b)
electric circuit
c)
electric resistance
123.
Material that PREVENTS electric current or heat from flowing.
a)
electromagnetic field
b)
electric current
c)
insulator
124.
Material that allows electric current or heat to flow through easily.
a)
electromagnetic field
b)
conductor
c)
open circuit
d)
electric current
125.
A(n)    is a closed loop of conductive material that a current can flow through.
a)
electric current
b)
electric circuit
c)
electric resistance
126.
A circuit MUST be _______ in order for the current to flow
a)
open
b)
closed
127.
Where would you find the circuit breaker?
a)
fuse box
b)
kitchen
c)
tool box
d)
outlet
128.
What would you do if an electrical circuit gets overloaded?
a)
repair with a new fuse
b)
unplug and plug back in
c)
flip the circuit breaker
d)
run and hide
129.
What would you do if a fuse is blown?
a)
replace it with a new fuse that has the same current
b)
replace it with a new fuse with a different current
c)
flip the circuit breaker
d)
unplug all appliances
130.
Circuit breakers and fuses protect  ___________.
a)
devices from breaking
b)
devices from electricuting you
c)
devices from getting wet
d)
devices from overheating
131.
A turbine is used to ________ the magnet in a generator.
a)
rotate
b)
electrify
c)
attract
d)
repel
132.
A device that converts electrical energy into kinetic energy
a)
A. electromagnet
b)
B. electromagnetic induction
c)
C. electric motor
d)
D. electromagnetism
133.
An example of a conductor is :
a)
a glass paperweight
b)
a plastic cap
c)
a metal screw
d)
a wooden handle
134.
What uses induction to increase or decrease the voltage of alternating current?
a)
Galvonometers
b)
Transformers
c)
Armatures 
d)
Generators 
135.
In large generators in power plants, ___________ rotate inside a coil of wire to produce an electric current.
a)
Wind
b)
Water
c)
Magnets
d)
Circuits
136.

The spoon will now pick up small objects made of iron. This is because the flow of electricity is able to produce ______.

a)

thermal energy

b)

magnetic fields

c)

sound waves

137.

A vandergraph machine is used to generate static electricity, what charge does the dome have?

a)

negative

b)

positive

c)

exciting

d)

none

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