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Worksheets

Pressure, Electricity & Magnet

Total questions: 150

Worksheet time: 4hrs 20mins

Name
Class
Date
1.
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.
2.
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
3.
A device that uses a free-moving magnetic needle to show direction is a:
a)
lodestone
b)
magnet
c)
compass
d)
magnetic field
4.
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
5.
What causes electricity?
a)
moving neutrons
b)
moving protons
c)
moving atoms
d)
moving electrons
6.
What type of charge do electrons have?
a)
negative
b)
positive 
c)
neutral
d)
nothing
7.
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
8.
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
9.
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
10.
The movement of electrically charged particles is 
a)
electric current
b)
electric circuit
c)
electric resistance
11.
Material that PREVENTS electric current or heat from flowing.
a)
electromagnetic field
b)
electric current
c)
insulator
12.
Material that allows electric current or heat to flow through easily.
a)
electromagnetic field
b)
conductor
c)
open circuit
d)
electric current
13.
A(n)    is a closed loop of conductive material that a current can flow through.
a)
electric current
b)
electric circuit
c)
electric resistance
14.
A circuit MUST be _______ in order for the current to flow
a)
open
b)
closed
15.
Which of the following is unsafe?
a)
Using a surge protector when you have a lot of devices to plug into one outlet.
b)
Replacing a blown fuse with a fuse that has the same current
c)
Resetting a breaker box after a circuit breaker trips
d)
Using multiple extension cords on one outlet
16.
Where would you find the circuit breaker?
a)
fuse box
b)
kitchen
c)
tool box
d)
outlet
17.
Circuit breakers and fuses protect  ___________.
a)
devices from breaking
b)
devices from electricuting you
c)
devices from getting wet
d)
devices from overheating
18.
What is an electric circuit with more than one path for an electric current to flow?
a)
Series Circuit
b)
Electric Current
c)
Eletromagnet
d)
Parallel Circuit
19.
What is a material through which electrons cannot move easily?
a)
Conductor
b)
Insulator
c)
Magnet
d)
Circuit
20.
What is an electric circuit with only one closed path of an electric current to follow?
a)
Series Circuit
b)
Parallel Circuit
c)
Electromagnet
d)
Voltage
21.
What is the name of a magnet created by wrapping a current-carrying wire around a ferromagnetic core?
a)
Electromagnet
b)
Magnetic Pole
c)
Voltage
d)
Electric Current
22.
Where on a magnet is the force the strongest?
a)
Magnetic Pole
b)
Attract
c)
Repel
d)
Conductor
23.
A material that has a strong attraction to magnets is called a _______. 
a)
Ferromagnetic Element
b)
Circuit
c)
Conductor
d)
Insulator
24.
What happens when the south poles of two magnetic fields overlap?
a)
Attract
b)
Repel
c)
Conduct
d)
Insulate
25.
What is the name for any object that attracts the metal iron?
a)
Magnet
b)
Circuit
c)
Conductor
d)
Insulator
26.
Any attraction or repulsion between magnets is called...
a)
Electric Resistance
b)
Electric Current
c)
Magnetic Force
d)
Voltage
27.
What happens when the north and south poles of two magnetic fields overlap?
a)
Attraction
b)
Repulsion
c)
Resistance
d)
Current
28.
which two poles attract 
a)
north and south
b)
south and south
c)
north and east
d)
east and west
29.
what can be attracted to magnets?
a)
wood
b)
skin
c)
Metals such as iron, nickel and cobalt
30.
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
31.
Which of these objects is an insulator?
a)
Copper Wire
b)
Paper Clip
c)
Steel Pole
d)
Rubber Gloves
32.
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.
33.
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.
34.
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
35.
Surrounding every magnet is a __________  __________.
a)
magnetic field
b)
electrical current
c)
another magnet
d)
an enemy
36.
Huge wheels that rotate when pushed by water, wind or steam.
a)
turbines
b)
leads
c)
magnets
37.
What is this device?
a)
electromagnet
b)
generator
c)
electric motor
38.

The area surrounding the magnet that allows it to attract or repel is called___________. (Shown in black)

a)

electrical field

b)

magnetic poles

c)

protons

d)

magnetic field

39.

Magnets are attracted to ________.

a)

all metals

b)

iron, nickel and copper

c)

iron, nickel and cobalt

d)

iron, nickel, and aluminum

40.

if the balloon is rubbed against the sweater, what will happen next?

a)

The electrons in the sweater will attract the protons in the balloon.

b)

The electrons in the sweater will repel the protons in the balloon.

c)

The electrons in the sweater will attract the neutrons in the sweater

d)

Nothing, the balloon and the sweater have equal charges

41.

Magnet are attracted when_______.

a)

both north poles are facing one another.

b)

both south poles are facing one another

c)

a north and a south pole are facing one another

42.

Which statement is true?

a)

All magnets have a North and a South pole

b)

All magnets can attract large objects

c)

Magnets can not pull through solids

d)

All magnets have the same size magnetic field

43.

Before John touches the door, he receives a zap of static electricity. This is caused by__________.

a)

friction

b)

conduction

c)

induction

44.

The south end of a magnet will______________.

a)

repel a copper nail

b)

repel the north end of another magnet

c)

repel the south end of another magnet

45.

Mr. Gonzales makes a mixture of four solid materials. Which of these 4 materials will a bar magnet be able to pull out?

a)

rubber

b)

sand

c)

tooth picks

d)

iron fillings

46.

Which of the following best explains this picture?

a)

Same poles attract

b)

Different poles attract

c)

Different poles repel

d)

Same poles repel

47.

Why did the rod move away from the balloon?

a)

They attract because they have the same charge

b)

They attract because they have different charges

c)

They repel because they have the same charge

d)

They repel because the have different charges

48.

When magnetic field lines are drawn, they appear to _______.

a)

form straight lines

b)

form criss-crossed lines like an X

c)

form curved lines from North to South poles and outward

d)

spread out in all directions

49.

What is an electric current?

a)

a build up of electrons

b)

the difference in charge between 2 points

c)

the flow of electrons over a circuit

d)

the opposition to flow of electrons

50.

What is the unit we use to measure electric current (I)?

a)

ampere (amp)

b)

ohm

c)

volt

d)

newton

51.

A closed path where electricity flows is called:

a)
path
b)
current
c)
circuit
52.
What is the difference between a conductor and an insulator?
a)
An insulator allows electricity to flow through it easily and a conductor does not
b)
A conductor allows electricity to flow through it easily and an insulator does not.
c)
An insulator is magnetic and a conductor is not
d)
A conductor is magnetic and an insulator is not
53.

Which one is a parallel circuit?

a)
b)
c)
d)
54.

A type of magnet that has temporary magnetic field when electric current flows through it.

a)

Bar magnet

b)

Red and Blue magnet

c)

Permanent Magnet

d)

Electromagnet

55.

Which would not make a stronger electromagnet?

a)

using a larger wire

b)

adding another battery

c)

adding more coils

d)

using a different type of metal

56.

How can you increase the current moving through a circuit?

a)

decrease the battery size

b)

add an ammeter

c)

increase the resistance

d)

decrease the resistance

57.

The strongest parts of the magnet are ...

a)

fronts

b)

backs

c)

poles

d)

middle

58.

A magnet will pick up an object that is made of...

a)

plastic

b)

iron or steel

c)

glass

d)

copper

59.
Are the magnetic field lines in the picture correct?
a)
Yes, because they point from north to south.
b)
No, because they point from north to south (they're supposed to go the other way).
c)
Yes, because the North pole is on the left in all pictures.
d)
No, because the North pole is on the left in all pictures (it's supposed to be on the right).
60.

Which one represents the magnetic field lines of magnets repelling?

a)

A

b)

B

61.

How do objects become positively charged?

a)

They gain electrons

b)

They lose electrons

c)

Rubbing or Friction

62.

How do objects become negatively charged?

a)

They gain electrons

b)

They lose electrons

c)

Rubbing or Friction

63.

Magnets have _____ and _____ poles.

a)

North and south

b)

Positive and negative

c)

North and positive

d)

South and negative

64.

What type of magnet is this?

a)

Ring magnet

b)

Horseshoe magnet

c)

Bar magnet

d)

Disc magnet

65.

Pressure in gases is a measure of:

a)

the number of collisions per second of the particles with the side of the container.

b)

the force of the collisions of the particles with the side of the container.

c)

the amount of space taken up by the particles in the container.

d)

None of the above

66.

Pressure can be exerted by solids, liquids and gases.

a)

TRUE

b)

FALSE

67.

A dam (not the wall) is an example of pressure in:

a)

Solids

b)

Liquids

c)

Gases

d)

Plasma

68.

The pressure inside the balloon will:

a)

Decrease

b)

Increase

c)

Remain the same

d)

Not enough information to formulate an answer

69.

The pressure of the gas in the balloon in the ice water will be:

a)

Greater than that of the balloon in the boiling water.

b)

Less than that of the balloon in the boiling water.

c)

The same as that of the balloon in the boiling water.

d)

Not enough information to answer the statement.

70.

This is an example of the everyday application of pressure in:

a)

Solids

b)

Liquids

c)

Gases

d)

Plasma

71.

The pressure inside the syringe will decrease if we move the plunger in:

a)

Direction A

b)

Direction B

c)

We don't have to move the plunger as the pressure will change on its own.

d)

None of the above answers.

72.

We can increase the pressure of a gas by:

a)

Adding more gas.

b)

Reduce the volume of the container.

c)

Increase the temperature of the gas.

d)

None of the above answers.

73.

The reason gases can be compressed is because:

a)

The particles are very close together.

b)

The particles are merely vibrating.

c)

The particles are unable to move.

d)

The particles are very far apart.

74.
What pressure does a 4000N horse exert on the ground if each foot is 10cm2?
a)
40 N/cm2
b)
100 N/cm2
c)
400 N/cm2
d)
10 N/cm2
75.
If the horse reared up on 2 legs what effect would it have on the pressure?
a)
it will exert half the pressure it did before
b)
it will exert the same pressure it did before
c)
it will exert twice the pressure it did before
d)
it will exert four times the pressure it did before
76.
Army tank tracks are useful for travelling through the mud because..
a)
they decrease the force the vehicle exerts on the ground
b)
they increase the force the vehicle exerts on the ground
c)
they decrease the pressure the vehicle exerts on the ground
d)
they increase the pressure the vehicle exerts on the ground
77.
Which of these animals would probably cause the greatest pressure on the ground?
a)
A fat cow with big feet
b)
A fat cow with small feet
c)
 A calf with big feet
d)
A calf with small feet
78.
How would you calculate the force to be used on a brake of area 0.5cm2 if the slave cylinder has a 4cm2 area and needs 800N to stop the car.
a)
4 x 800 x 0.5
b)
800/0.5 x 4
c)
0.5 x 4 x 800
d)
800 x 0.5 /4
79.
What is the equation used to calculate pressure?
a)
pressure= force/mass
b)
pressure =mass/volume
c)
pressure=area/force
d)
pressure=force/area
80.
What is the unit of measurement for pressure?
a)
pascal
b)
grams
c)
milliters
d)
meters
81.
Which of the following would increase the pressure on a system?
a)
Increase the Temperature
b)
Pump in more gas
c)
Decrease the volume
d)
All of these
82.

Diagram shows the design of a dam. Why does the thickness of the dam increase with its depth?

a)

The design of this structure is stronger.

b)

Water pressure increases with depth.

c)

The cost of construction is lower.

d)

Water pressure acts uniformly in all directions.

83.

In the image which hole will allow the water to travel furthest?

a)

A

b)

B

c)

C

84.

When you increase your depth under water, the water pressure on your body

a)

increases

b)

decreases

c)

stays the same

85.

Why won't you sink in mud if you wear boots?

a)

Because the surface area is larger creating less pressure.

b)

Has air in it to keep you floating.

c)

Because the mud won't want you.

86.
Which of the statements is true?
a)
The bottom of the boot exerts more pressure than the shoe as a result of an increase in surface area.
b)
The bottom of the shoe exerts more pressure than the boot as a result of an decrease in surface area.
c)
The bottom of the shoe exerts the same pressure as the bottom of the boot.
87.
The pressure resulting from a force of 50 N exerted over an area of 5 m2 is
a)
10 N
b)
0.1 N
c)
10 N/m2
d)
0.1 Pa
88.

I have a gap in my circuit that I need to close. Which of the following materials could close the gap?

a)

a cotton t-shirt

b)

a piece of aluminum foil

c)

a piece of Styrofoam

d)

a piece of paper

89.

What keeps us from being electrocuted?

a)

Our skin

b)

Wires that are really long

c)

Our clothes

d)

Plastic coating on wires

90.

A compass works by using

a)

Earth's gravitational pull

b)

Earth's magnetic force

c)

Earth's rotating axis

d)

Earth's atmospheric pressure

91.
What is the difference between particles in a gas and a solid?
a)
gas particles are closer together
b)
solid particles move faster than gas particles
c)
solid particles expand on heating
d)
gas particles have more kinetic energy than solid particles
92.
How can we increase the gas pressure inside a sealed container?
a)
Increase the number of particles inside the container
b)
Increase the temperature
c)
Decrease the volume of the container
d)
All of these
93.

If a hairspray can is heated, what can be expected of the pressure of the gas inside the can?

a)

The pressure will increase

b)

The pressure will decrease

c)

The pressure will remain constant

d)

The pressure will equalize

94.
Which of the following would increase the (gas) pressure of a system?
a)
Increase the Temperature
b)
Pump in more gas
c)
Decrease the volume
d)
All of these
95.
In what direction(s) does air exert pressure?
a)
everywhere
b)
no where
c)
there is no pressure
d)
downward
96.
A _____________ is the scientific  instrument used to measure air pressure.
a)
barometer
b)
thermometer
c)
mercury
d)
watch
97.

Pressure can be exerted by solids, liquids and gases.

a)

TRUE

b)

FALSE

98.

The pressure inside the balloon will:

a)

Decrease

b)

Increase

c)

Remain the same

d)

Not enough information to formulate an answer

99.

The pressure of the gas in the balloon in the ice water will be:

a)

Greater than that of the balloon in the boiling water.

b)

Less than that of the balloon in the boiling water.

c)

The same as that of the balloon in the boiling water.

d)

Not enough information to answer the statement.

100.

This is an example of the everyday application of pressure in:

a)

Solids

b)

Liquids

c)

Gases

d)

Plasma

101.

If an object's surface area is smaller does it create more or less pressure?

a)

More

b)

Less

c)

The same

d)

None

102.

A person weighs 700N and their feet have a surface area of 0.1m2. How much pressure is exerted?

a)

7000N/m2

b)

100N/m2

c)

70N/cm2

d)

1000N/m2

103.

What does N/m2 mean?

a)

Newtons per squared metre

b)

Kilograms per squared mile

c)

Kilograms per squared mile

d)

Metre per squared Newton

104.

Which of the following decreases pressure?

a)

Pins

b)

Ice skates

c)

Nails

d)

Snow shoes

105.

A student uses a glue stick with an area of 4 cm2, putting a pressure of 0.5 N/cm2 on her book. Calculate the force she puts on the glue stick.

a)

1 N

b)

2 N

c)

20 N

d)

15 N

106.
If the horse reared up on 2 legs what effect would it have on the pressure?
a)
it will exert half the pressure it did before
b)
it will exert the same pressure it did before
c)
it will exert twice the pressure it did before
d)
it will exert four times the pressure it did before
107.

Isaac weighs 800 N. His foot is roughly 0.1 m x 0.2 m.

a. Calculate the pressure on the ground if he stands on one foot.

b. Calculate the pressure on the ground if he stands on both feet.

(a)  

108.
This is the symbol for a _____?
a)
Variable resistor
b)
Thermistor
c)
Resistor
d)
Fuse
109.
This is the symbol for a _____?
a)
Diode
b)
LED
c)
Microphone
d)
Loudspeaker
110.
This is the symbol for a _____?
a)
Lamp
b)
Water wheel
c)
Loudspeaker
d)
Motor
111.
This is the symbol for a _____?
a)
Fixed resistor
b)
Variable resistor
c)
Fuse
d)
Box
112.
This is the symbol for a _____?
a)
Fuse
b)
Resistor
c)
Heater
d)
Strip light
113.
This is the symbol for a _____?
a)
an AC current source
b)
a DC current source
c)
a battery
d)
a single cell
114.
This is the symbol for a _____?
a)
switch
b)
light 
c)
battery
d)
wires
115.
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.
116.
Which best describes a parallel circuit?
a)
Electricity flows along one pathway.
b)
The flow of electricity comes from one source. 
c)
Electricity flows along more than one pathway. 
d)
The flow of electricity comes from more than one source. 
117.
What is one problem with using a series circuit? 
a)
It has a lot of series. 
b)
If one goes down, they all go down! 
c)
It doesn't work properly.
d)
There are no problems. 
118.
What is one benefits of using a parallel circuit?  
a)
It gets confusing.
b)
There are no problems.
c)
If one goes down, it does not affect the others. 
d)
Porque es para llelio. 
119.

The diagram shows two balls that are electrostatically charged. If the blue ball is positively charged, the red ball has a (a)   charge.

120.

The diagram shows an uncharged rod that is rubbed with a cloth and becomes positively charged. This is because (a)   from the rod moved to the cloth.

121.

When a fluid fills a closed container, it exerts pressure

a)

only on the bottom of the container

b)

only on the sides of the container

c)

only on particles within the fluid

d)

everywhere inside the container

122.

Fluids exert pressure because they

a)

contain force particles

b)

are confined to small area

c)

have constantly moving particles

d)

all of these are correct

123.

A submarine is found 20 meters below the surface of the sea. The density of sea water is 1020 kg m-3 and g = 10 m/s2 What is the pressure due to the sea water acting on the submarine?

a)

20.4 Pa

b)

2.04 x 103 Pa

c)

2.04 x 102 Pa

d)

2.04 x 105 Pa

e)

2.04 x 10-2 Pa

124.

The pressure due to water at the base of a pond is measured as 50 kPa. What is the depth of the pond?

[density of water is 1,000 kg m-3]

a)

10 meter

b)

12 meter

c)

8 meter

d)

5 meter

125.

The greatest ocean depths on the Earth are found in the Marianas Trench near the Philippines. Given its depth is 11.0 km and the density of seawater is 1200 kg/m3, How do you calculate the pressure due to the ocean at the bottom of this trench.

a)

1200x10x11

b)

1200x11

c)

1200x11000x10

d)

1200x10

126.
Two identical containers containing liquid M and liquid N with 28 cm height and 20 cm height respectively. Both containers produce the same water spurt.
If the density of liquid M is 2.0 g cm−3, find the density of liquid N.
a)
0.70 g cm−3
b)
1.40 g cm−3
c)
1.43 g cm−3
d)
2.80 g cm−3
127.
Given that the pressure of sea water at the bottom of an ocean is 7.65 × 107 N m−2, calculate the depth of the ocean.
[Density of sea water = 1.02 × 103 kg m−3]
a)
7.5 × 108 m
b)
7.5 × 104 m
c)
7.5 × 103 m
d)
7.5 × 102 m
128.
The pressure of water exerted on the fishes is PX, PY and PZ respectively.
Which comparison is correct about the pressure exerted on the fishes?
a)
PZ > PY > PX 
b)
PZ = PX < PY
c)
PZ = PX > PY
d)
PZ < PX < PY
129.

Calculate the pressure exerted by the water on the fish.

[Density of water = 1 000 kg m−3

Atmospheric pressure at sea level, Patm = 1.0 x105 Pa]

a)

5.0 × 104 Pa

b)

5.0 × 107 Pa

c)

5.0 × 106 Pa

d)

5.0 × 10-1 Pa

130.

Why can you lie down on a bed of nails without having any nail break your skin, but if you step on a single nail, it will go right through your foot?

a)

There is more force exerted on a single nail than the entire bed of nails.

b)

The force is the same in both cases, but there is less pressure when you lie on the bed of nails.

c)

The force is the same in both cases, but there is more pressure when you lie on the bed of nails.

d)

The area is the same in both cases, but there is more force when you lie on the of nails.

131.

A brick with dimensions 10 cm,25 cm, and 12 cm is put on a horizontal surface, as shown in the figure. On which face should the brick stand so that it applies the least pressure on the surface?

a)

Face A

b)

Face B

c)

Face C

d)

The pressure is the same for all faces.

132.

A horse is standing on the ground on its hooves, each of which has an area of 80 cm280\ cm^2 .If the horse has a mass of 400 kg, calculate the pressure it caused on the ground. Let 𝑔=10 m/s2𝑔=10\ m/s^2 .

a)

500 kN/m2500\ kN/m^2   

b)

320 kN/m2320\ kN/m^2  

c)

125 kN/m2125\ kN/m^2  

d)

250 kN/m2250\ kN/m^2  

133.

A solid cuboid of dimensions 12 cm,8 cm and 4 cm and mass 2.5 kg is placed on a horizontal plane surface. Calculate the maximum pressure it can produce.

a)

5‎ ‎208 Pa

b)

9‎ ‎671 Pa

c)

2‎ ‎604 Pa

d)

7‎ ‎813 Pa

134.
What size resistor would produce a 3 Amp current flow with a 12 Volt battery
a)
1 Ohm
b)
3 Ohms
c)
4 Ohms
d)
12 Ohms
135.
What is current measured in?
a)
Ω (Ohms)
b)
V (Volts)
c)
A (Amps)
d)
W (Watts)
136.
How many Volts would we need to produce a current flow of 8 Amps through a 6 Ohm resistor
a)
12 volts
b)
24 volts
c)
1.3333
d)
48 volts
137.

If there are 40 Volts and 5 Amps running through an electrical circuit, what is the resistance of the circuit?

a)

1 Ohm

b)

2 Ohms

c)

4 Ohms

d)

6 Ohms

e)

8 Ohms

138.

The potential difference across a 5 kΩ is 12 V. Find the current flowing through the resistor

a)

60 mA

b)

2.4 mA

c)

1.7 mA

d)

0.998 mA

139.
Magnets can interact without touching.
a)
True
b)
False
140.
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
141.

The area of magnetic force around a magnet is known as its _____________.

a)

magnetic field

b)

magnetic declination

c)

magnetic fan lines

d)

magnetic tan lines

142.
A north pole and a south pole will attract.
a)
True
b)
False
143.

A ________ is a device that has a magnet on a needle that spins freely. It is used for navigation because its needle usually points north.

a)

calculator

b)

ruler

c)

compass

d)

map

144.

Dylan puts two magnetic toy trains very close to each other on a track. What will happen next, and why?

a)

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

b)

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

c)

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

d)

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

145.

True or False: A magnet is attracting when it pushes objects away from each other.

a)

True

b)

False

146.
Which way will the magnets move after they are released?
a)
Towards each other
b)
Away from each other
c)
Not enough information
147.
Magnetic poles that are unlike ________and magnetic poles that are alike ___________.
a)
run; stay
b)
attract; repel
c)
stay; repel
d)
repel; attract
148.
The SI unit of magnetic field is 
a)
weber
b)
guass
c)
tesla
d)
farad
149.
There are several modern uses of magnets.  Magnets allow high speed trains to ______________________ above the track.  They go faster because without touching the tracks there is no friction to slow them down.
a)
collide
b)
levitate
c)
attract
d)
repair
150.
Are the magnetic field lines in the picture correct?
a)
Yes, because they point from north to south.
b)
No, because they point from north to south (they're supposed to go the other way).
c)
Yes, because the North pole is on the left in all pictures.
d)
No, because the North pole is on the left in all pictures (it's supposed to be on the right).

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