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8th grade final review

Total questions: 103

Worksheet time: 2hrs 49mins

Name
Class
Date
1.

The size or quantity of something

a)

Electromagnetic force

b)

Magnetic strength

c)

Magnitude

d)

Electric force

2.

What will happen if the north ends of two magnets are placed near each other?

a)

They will attract each other.

b)

Both magnets will get weaker.

c)

They will repulse (repel) each other.

d)

Nothing will happen.

3.

A directional flow of electrical charge through an object or medium

a)

Magnitude

b)

Magnetic force

c)

Electromagnetic force

d)

Current

4.

Force resulting from interaction between electrically charged particles

a)

Electromagnetic force

b)

Current

c)

Magnetic strength

d)

Magnetic force

5.

Magnetic strength

a)

Attraction or repulsion that arises between electrically charged particles because of their motion

b)

Force resulting from interaction between electrically charged particles

c)

How strong a magnet is

d)

A directional flow of electrical charge through an object or medium

6.

Magnetic force

a)

Attraction or repulsion that arises between electrically charged particles because of their motion

b)

How strong a magnet is

c)

Force resulting from interaction between electrically charged particles

d)

The size or quantity of something

7.

How can the strength of an electromagnet increase?

a)

Remove the core, leaving only the coils of wire.

b)

Add more loops (coils) of wire around the core.

c)

Remove the battery.

d)

Remove loops (coils) of wire from around the core.

8.

What will happen as an electron (-) gets closer to a proton (+)?

a)

The attraction will be stronger.

b)

The repulsion will be stronger.

c)

The attraction will be weaker.

d)

Nothing will happen to the electric field.

9.

Electric force

a)

Attraction or repulsion that arises between electrically charged particles because of their motion

b)

Force resulting from interaction between electrically charged particles

c)

The size or quantity of something

d)

Attractive or repulsive interactions between any two charged objects

10.

As the distance between magnets increases, the attraction between them will –

a)

Increase

b)

Become stronger

c)

Decrease

d)

Stay the same

11.

What affects the strength of an electrical field?

a)

The distance from the source

b)

Both the quantity of the charge and the distance from the source

c)

None of these

d)

The quantity of the charge

12.

Students want to investigate how the amount of electric energy delivered to a motor affects its speed. Which of the following procedures will most likely produce the data students need to answer their question?

a)

Measure the rotations per second of a motor when it is connected to one battery, two batteries, and three batteries.

b)

Add larger and larger motors to a battery to determine the size of the largest motor the battery is able to run.

c)

Closely observe the rotation of the motor to see if the direction of spin reverses when the poles of the battery are switched.

d)

Connect a series of motors to the same battery to figure out how many motors can be run off the same battery.

13.

Students attached both ends of a long wire to the poles of a battery and wrapped the wire around a spoon. In this arrangement, the spoon is able to pick up five paper clips.


(See Attached Diagram)


The students wrap more wire around the spoon and want to determine if the strength of the magnetic force has increased. Which of the following observations would indicate that wrapping more wire has increased the strength of the electromagnet?

a)

More wire was needed to wrap around the spoon.

b)

The spoon now picks up seven paper clips.

c)

Eventually, the battery runs out of energy.

d)

The ends of the wire must touch the battery's poles.

14.

The table provided shows data collected by students during an investigation of two electromagnets.


(See Attached Diagram)


Which of the following conclusions is supported by data on the table?

a)

When two electromagnets are of like charges, they attract each other.

b)

Electromagnets that repel each other have more force than those that attract each other.

c)

The greater the charges of two electromagnets, the greater the size of the force.

d)

If the charge on one magnet is positive, the charge on the other must be negative.

15.

The illustration shows a hand generator. Turning the handle of the generator spins a magnet and creates an electric current that lights the bulb.


(See Attached Diagram)


Which of the following observations can be used to indicate the strength of the current created by the generator?

a)

The brightness of the bulb

b)

The size of the magnet

c)

The length of the handle

d)

The mass of the generator

16.

This table shows the magnitude of electromagnetic force exerted by two electromagnets on each other as the distance between the two electromagnets is varied.


(See Attached Diagram)


The data on the table provide evidence for which of the following conclusions?

a)

The force between any two magnets is always constant, regardless of distance.

b)

As distance between electromagnets increases, the electromagnetic force also increases.

c)

The smaller the distance between two electromagnets, the greater the force.

d)

The force between two magnets depends only on the charge of the electromagnets.

17.

When placed at equal distances apart, the greatest gravitational attraction will be between two

a)

skateboards

b)

bowling balls

c)

school buses

18.

Which is needed to determine the amount of gravitational force between two objects?

a)

distance and mass

b)

weight and time

c)

area and weight

19.

The gravitational force exerted by an object depends on its

a)

volume

b)

mass

c)

weight

20.

A student drops a bowling ball and an apple from a third-story window. Both objects hit the ground at the same time. From the experiment, the student should conclude that

a)

the apple weighs more than the bowling ball

b)

more air friction is acting on the apple than on the bowling ball

c)

gravity pulls on both objects, causing them to fall at the same time.

21.
As the product of two objects' masses increases, the pull of gravity
a)
Increases
b)
Decreases
c)
Stays the same
22.
This FORCE pulls things.  It PULLS things into orbit around the sun. 
a)
Newton
b)
gravity
c)
weight
d)
path
23.
Mass is a measurement of 
a)
how much matter is present in an object
b)
how much weight is present in an object
c)
the amount a spring is compressed on a scale
d)
none of the answers are correct
24.
Jupiter has about 317 times more mass than Earth. What can you infer from this fact? 
a)
That Jupiter’s gravitational force is much weaker than on Earth’s gravitational force.
b)
That Jupiter’s gravitational force is much stronger than Earth’s gravitational force.
c)
That Jupiter’s and Earth’s gravitational forces are equal.
d)
Mass has no effect on the gravitational force between two objects
25.
How can you explain that we have a stronger gravitational attraction with Earth than the Sun?
a)
The sun has a larger mass
b)
The sun has a smaller mass
c)
Closer to center of sun
d)
Closer to center of Earth
26.
Which of these best describes why your weight (on Earth) would change on another planet?
a)
Dehydration effects on different planets change weight.
b)
In general, the smaller the planet, the greater weight
c)
Different planets have different gravitational pulls
d)
Weight does not change, no matter where you are.
27.

What is the relationship between mass and gravitational pull?

a)

Higer mass creates higher gravitational pull

b)

Lower mass creates higher gravitational pull

c)

Lower gravitational pull creates more mass

28.

Which of the following data would support the claim that the gravitational force between objects depends on mass?

a)

A rocket can escape Earth’s gravity by traveling at high speed.

b)

Gravitational force is stronger on more massive planets.

c)

The further a planet is away from the sun, the smaller the gravitational force.

d)

An object’s weight can change depending where it is on Earth.

29.

Which of the following does not affect the gravitational force between the earth and the sun?

a)

The net electrical charge of the earth

b)

The distance between the earth and the sun

c)

The mass of the sun

d)

The mass of the earth

30.

An astronaut way out in space is considered to be “weightless". This is because–

a)

his mass is so small relative to the earth that gravity doesn’t affect him.

b)

gravitational force decreases greatly over long distances.

c)

gravitational force pushes objects away from each other at long distances.

d)

objects far away from the earth have less mass.

31.

Which statement is true?

a)

All objects with mass exert a gravitational force.

b)

Only celestial objects exert a gravitational force.

c)

Gravity can both push and pull objects.

d)

Only Earth exerts a gravitational force.

32.

The push or pull between two objects

a)

attract

b)

mass

c)

force

d)

gravitational force

33.

The matter in an object, which affects gravitational forces

a)

attract

b)

mass

c)

gravitational force

d)

force

34.

Objects being pulled together

a)

gravitational force

b)

attract

c)

mass

d)

force

35.

The force between two masses

a)

gravitational force

b)

force

c)

mass

d)

attract

36.

What two factors affect an object's kinetic energy?

a)

area and volume

b)

mass and weight

c)

weight and height

d)

mass and speed

37.

Kinetic energy is...

a)

energy carried in ultraviolet waves

b)

energy stored in food

c)

energy in motion

d)

energy from splitting an atom

38.

Kinetic energy is measured in

a)

Newtons (N)

b)

Joules (J)

c)

Kilograms (kg)

d)

miles per hour (mph)

39.

Where would this tossed baseball have the most amount of kinetic energy?

a)

point W

b)

point X

c)

point y

d)

point z

40.

Where would this tossed baseball have the least amount of potential energy?

a)

point W

b)

point X

c)

point y

d)

point z

41.
As mass increases, KE ...
a)
increases
b)
decreases
c)
stays the same
42.
As the velocity of an object decreases its KE will...
a)
increase
b)
decrease
c)
stay the same
43.
Why is it harder to stop a four-person bobsled than a three-person bobsled?
a)
the four-person sled has more KE
b)
the four-person sled has less KE
44.
The PE of a boulder on a hill will be ______ the KE of the boulder as it rolls down the hill.
a)
greater than
b)
less than
c)
the same as
45.
The Law of Conservation of Energy states that
a)
energy cannot be created nor destroyed, only transformed or transferred
b)
energy can be destroyed but not created
c)
energy can be created but not destroyed
46.

Mass is

a)

A measure of how much matter is in a substance

b)

A measure of much space a substance takes up

c)

A measure of how much sound a substance has

d)

A measure of the frequency of light waves a substance gives off

47.

An object is sitting on a shelf. What form of energy is the most relevant at this moment?

a)

potential energy

b)

kinetic energy

48.

Where does a roller coaster have the most kinetic energy?

a)

at the bottom of the first hill

b)

at the top of the first hill

c)

in a loop near the end of the ride

d)

when the riders get into the car

49.

Where does a roller coaster have the most potential energy?

a)

at the bottom of the first hill

b)

at the top of the first hill

c)

in a loop near the end of the ride

d)

when the riders get into the car

50.

Which object has the most potential energy?

a)

a feather 50 feet above the ground

b)

a grain of sand 20 feet above the ground

c)

a grain of sand 10 feet above the ground

d)

a feather 5 feet above the ground

51.

Increasing an object's mass will increase its kinetic energy.

a)

TRUE

b)

FALSE

52.

Increasing an object's speed will increase its kinetic energy.

a)

FALSE

b)

TRUE

53.

What is the equation for kinetic energy?

a)

Mass ×Speed22\frac{Mass\ \times Speed^2}{2}  

b)

Mass ×Speed2\frac{Mass\ \times Speed}{2}  

c)

Mass ×Speed2Mass\ \times Speed^2  

54.

How do we find speed?

a)

time x distance

b)

time - distance

c)

distance + time

d)

distance ÷ time

55.

The pace an object travels in a certain amount of time

a)

speed

b)

acceleration

c)

Velocity

d)

motion

56.
When one energy form is changed into another it is called a
a)
transformation
b)
transfer
c)
translocation
d)
transcription
57.

Kinetic energy is (a)   proportional to the mass of an object.

58.

The (a)   of a moving object is the rate of change of position with respect to time.

59.

(a)   is a measure of how much matter is in an object.

60.

A graph showing the kinetic energy of a 10 kg object at different speeds is provided. Based on the information in the graph, we can predict that the kinetic energy of the object at 2 m/s would be ...

a)

0 J

b)

5 J

c)

20 J

d)

60 J

61.
Which type of wave has a wave perpedicular to the disturbance?
a)
surface
b)
mechanical
c)
transverse
d)
longitudinal
62.
What happens when a mechanical wave travels through a medium?
a)
Waves are transferred
b)
Energy is transferred
c)
Mass is transferred
d)
Particles are transferred
63.
Energy can be transferred from one medium to another through _________.
a)
vibrations
b)
stacking objects
c)
an ordered sequence
d)
colors
64.
Which of these waves cannot travel in a vacuum?
a)
light wave
b)
sound wave
c)
electromagnetic wave
d)
microwave
65.
Which is true of a mechanical wave?
a)
It must have a medium
b)
It must travel in empty space.
c)
It can travel in a vacuum.
d)
Both sound and light are examples.
66.
What is the amplitude of a wave?
a)
the amount of time that occurs in one full cycle
b)
the distance traveled by the wave during one full cycle
c)
the amount of cycles that occur in a given time
d)
the size of the disturbance
67.
What is the wavelength of a wave?
a)
the size of the disturbance
b)
the amount of time that occurs in one full cycle
c)
the distance between two crests of a wave
d)
the amount of cycles that occur in a given time
68.
A transverse wave can be created in a Slinky® by moving it
a)
side to side.
b)
in a circular motion.
c)
together and apart.
d)
up and down.
69.
What is the speed of a wave if the wavelength is 100 m and the period is 20 s?
a)
2,000 m/s
b)
120 m/s
c)
80 m/s
d)
5 m/s
70.
What is the period of a wave if the wavelength is 100 m and the speed is 200 m/s?
a)
200,000 s
b)
0.5 s
c)
2 s
d)
100 s
71.

What happens when light passes through air?

a)

It is transmitted in a curved line.

b)

It is transmitted in a bent line.

c)

It is transmitted in a straight line.

d)

It is transmitted in a spiral line.

72.

What happens when light passes from air into water?

a)

It is transmitted in a straight line until it hits the water; then the light bends at an angle.

b)

It is transmitted in a straight line until it hits the water; then the light curves into the water.

c)

It is transmitted in a straight line until it hits the water; then the light spirals down into the water.

d)

It is transmitted in a straight line through the air into the water.

73.

What happens when light passes from air into glass?

a)

It is transmitted in a straight line through the air into the glass.

b)

It is transmitted in a straight line until it hits the glass; then the light spirals down into the water.

c)

It is transmitted in a straight line until it hits the glass; then the light curves.

d)

It is transmitted in a straight line until it hits the glass; then the light bends at an angle.

74.

What else happens to light when it hits water or glass besides transmission?

a)

Some of the light is refracted back into the air.

b)

Some of the light is reflected back into the air.

c)

Some of the light is diffused back into the air.

d)

None of the choices given.

75.

Reflection is when a mirror image___off a smooth surface.

a)

bends

b)

bounces

c)

blends

d)

bugs

76.

We only see the colors that are____ off a surface.

a)

reflected

b)

refracted

c)

diffused

d)

absorbed

77.

What is diffraction?

a)

The bending of waves around an obstacle.

b)

The bending of waves through an opening

c)

Both of the. choices given.

d)

Neither of the choices given.

78.

What shape do waves take on when they are diffracted?

a)

Curved lines

b)

Straight lines

79.

If your back is to the Sun that is shining, and you are looking at rain in front of you, what might you see?

a)

a rainbow

b)

a comet

c)

the Moon

80.

Light is an electromagnetic wave.

a)

True

b)

False

81.

Electromagnetic waves with longer wavelengths have ____ than electromagnetic waves with shorter wavelengths.

a)

higher

b)

lower

82.

In the visible light spectrum, each color has its own ____; no other color has it.

a)

pixels

b)

wavelength

c)

transmission

83.

White light is made up of ____.

a)

all colors

b)

no color

c)

pale colors

d)

gamma rays

84.

A student places a pencil in a glass of water and observes that the pencil appears to be broken. Which of these provides the best explanation for why the pencil appears broken?

a)

The pencil absorbs all the lights rays that hit it.

b)

Water reflects light rays away from the pencil.

c)

Light rays are bent by the water in the glass.

d)

The surface of the water reflects light rays.

85.

The illustration shows the path of a laser leaving a laser pointer. At what point is the laser being absorbed?

a)

A

b)

B

c)

C

d)

D

86.

The distance from Earth to the Moon can be accurately calculated by pointing high-powered lasers onto the Moon’s surface. The time it takes for the light to return is used to find the distance. To make this possible, astronauts on the Apollo 11 Moon mission had to place a device on the Moon that would –

a)

store the laser light for future use.

b)

bounce the laser light back to Earth.

c)

allow the laser light to pass through.

d)

change the frequency of the laser light.

87.

Which of the following is the best example of an object absorbing light?

a)

A black sweater in the sun.

b)

A clean window in the sun.

c)

A curved mirror in the sun.

d)

A long shadow in the sun.

88.

Solar panels generate electricity using photovoltaic cells that receive sunlight. To protect these cells from moisture while allowing sunlight to pass through, engineers must design a cover for the solar panel that is –

a)

waterproof and transmits light.

b)

very flexible and reflects light.

c)

stronger than steel and bends light.

d)

cold to the touch and absorbs light.

89.

The portion of the electromagnetic spectrum that humans can see

a)

Transmitted

b)

Visible light waves

c)

Absorbed

d)

Electromagnetic spectrum

90.

Energy waves bouncing off an object

a)

Transmitted

b)

Visible light waves

c)

Absorbed

d)

Reflected

91.

All the possible energy levels of electromagnetic radiation

a)

Visible light waves

b)

Absorbed

c)

Electromagnetic spectrum

d)

Reflected

92.

When an energy wave is soaked or taken in

a)

Transmitted

b)

Visible light waves

c)

Absorbed

d)

Reflected

93.

When light passes through an object

a)

Transmitted

b)

Absorbed

c)

Reflected

d)

Diffused

94.
A green plant appears green because it is absorbing all colors except
a)
yellow.
b)
blue.
c)
red.
d)
green.
95.

Typically, sound will travel fastest in a –

a)

Liquid

b)

Plasma

c)

Gas

d)

Solid

96.

A wave that is carried by vibrations through a physical medium

a)

light wave

b)

wave hello

c)

Mechanical wave

d)

wave goodbye

97.

What image show light being reflected?

a)
b)
c)
98.

What image show light being transmitted?

a)
b)
c)
99.

What image show light being absorbed?

a)
b)
c)
100.
Which statement about sound waves is true? 
a)
Air travels with them
b)
They travel through a vacuum
c)
They exist only if heard
d)
They can be reflected. 
101.

Sound travels the FASTEST through _____________, SLOWER through ______________ and SLOWEST through _________________.

a)

liquids, solids, gases

b)

solids, gases, liquids

c)

solids, liquids, gases

d)

gases, liquids, solids

102.
Why is sound able to travel faster through a solid than a gas?
a)
Gas molecules are packed tightly.
b)
Sound does not travel faster through a solid than a gas.
c)
Solid molecules are packed tightly.
d)
Gas molecules move slowly.
103.
What medium does sound travel through slowest?
a)
gas
b)
solid
c)
liquid
d)
trees

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