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Year 8 Science - Energy - Test Revision

Total questions: 104

Worksheet time: 1hrs 7mins

Name
Class
Date
1.

True or false: Energy makes things happen.

a)

True

b)

False

2.

The law of energy conservation states that energy cannot be (a)   or destroyed. It can only be transferred or transformed.

3.

What types of energy are represented in the image? Focus on the most important one!

a)

Sound

b)

Elastic potential

c)

Nuclear

d)

Gravitational potential

4.

What types of energy are represented in the image? Focus on the most important one!

a)

Sound

b)

Elastic potential

c)

Nuclear

d)

Gravitational potential

5.

What types of energy are represented in the image? Focus on the most important one!

a)

Sound

b)

Elastic potential

c)

Nuclear

d)

Gravitational potential

6.

What types of energy are represented in the image? Focus on the most important one!

a)

Sound

b)

Elastic potential

c)

Nuclear

d)

Gravitational potential

7.

What types of energy are represented in the image? Focus on the most important one!

a)

Light

b)

Heat

c)

Electrical

d)

Chemical

8.

What types of energy are represented in the image? Focus on the most important one!

a)

Light

b)

Heat

c)

Electrical

d)

Chemical

9.

What types of energy are represented in the image? Focus on the most important one!

a)

Light

b)

Heat

c)

Electrical

d)

Chemical

10.

What types of energy are represented in the image? Focus on the most important one!

a)

Light

b)

Kinetic

c)

Electrical

d)

Elastic potential

11.

What types of energy are represented in the image? Focus on the most important one!

a)

Chemical

b)

Kinetic

c)

Electrical

d)

Elastic potential

12.

Which of the types of energy cannot be classified as potential energy?

a)

Chemical

b)

Kinetic

c)

Gravitational

d)

Elastic

13.

Which of the types of energy cannot be classified as a type of kinetic energy?

a)

Light

b)

Sound

c)

Electrical

d)

Elastic

14.

What is another word for 'stored' energy?

a)

Potential

b)

Kinetic

15.

When the same type of energy is passed from one object to another, we called it energy ...

(a)  

16.

When the type of energy changes, we call it an energy ...

(a)  

17.

When heat energy is transferred because two solid objects are in direct contact, we call it...

(a)  

18.

When heat energy moves around because of density differences, we call it ...

(a)  

19.

When heat energy is transferred without particles, it is transferred as ...

(a)  

20.

The input energy here is...

a)

Heat

b)

Sound

c)

Light

d)

Electrical

21.

The main output energy here is...

a)

Heat

b)

Sound

c)

Light

d)

Electrical

22.

The input energy here is...

a)

Heat

b)

Sound

c)

Chemical

d)

Electrical

23.

The main output energy here is...

a)

Heat

b)

Sound

c)

Light

d)

Kinetic

24.

The energy of motion or moving objects is called ... energy.

(a)  

25.

Energy is wasted in the form of ...

a)

Heat

b)

Sound

c)

Light

d)

Kinetic

26.

How much energy is provided at the start?

a)

10 J

b)

100 J

c)

90 J

d)

90%

27.

How much energy is wasted?

a)

10 J

b)

100 J

c)

90 J

d)

90%

28.

How much energy is useful?

a)

10 J

b)

100 J

c)

90 J

d)

90%

29.

What is the energy efficiency?

a)

10 J

b)

10%

c)

90 J

d)

90%

30.

True or false: Energy is the ability to do work.

a)

True

b)

False

31.

Which device is more energy efficient?

a)

The one on the left.

b)

The one on the right.

32.

Which object is not suitable to store elastic potential energy?

a)
b)
c)
d)
33.

Which object has the most gravitational potential energy?

a)
b)
c)
d)
34.

Which object has the least gravitational potential energy?

a)
b)
c)
d)
35.
dark colored surfaces _________ radiation
a)
reflect 
b)
absorb
36.

What type of heat transfer takes place when you touch a warm mug of hot chocolate?

a)

Radiation

b)

Convection

c)

Conduction

d)

None of the above

37.

Conduction requires

a)

Electricity

b)

the electromagnetic spectrum and particles

c)

air or water flow

d)

direct contact

38.

Heat transfer always moves ...

a)

cold to hot

b)

east to west

c)

hot to cold

d)

north to south

39.

If you walk barefoot on hot asphalt, energy is transferred by which process?

a)

Convection

b)

Radiation

c)

Conduction

d)

Reflection

40.

Energy is transferred as heat between two objects of ___________ temperatures.

a)

differing

b)

same

41.
Which direction is heat flowing in the picture?
a)
from the hand to the ice
b)
from the ice to the hand
c)
heat is not being transferred
d)
there is no way to tell
42.
The transfer of heat energy by direct contact, or touch, is __________________?
a)
radiation
b)
convection
c)
conduction
d)
greenhouse effect
43.

Where do we see conduction in a pot of boiling water on the stove?

a)

The water heats up by touching the hot, metal pot.

b)

The steam from the hot water rises out of the pot.

c)

The heat from the fire can be felt on all sides.

44.

When air is heated, what happens to its mass?

a)

increases

b)

decreases

c)

remains the same

45.

When air is heated, its volume ____________.

a)

increases

b)

decreases

c)

remains the same

46.

When air is heated, its density ___________.

a)

increases

b)

decreases

c)

remains the same

47.

Convection can take place in ____________.

a)

solids only.

b)

liquids only.

c)

liguids and gases only.

d)

solids, liquids and gases.

48.

Which of the following is an application of convection?

a)

The movement of heat through a metal pan to the food.

b)

The use of ice box to keep drinks cool.

c)

The sea breeze that blows from sea to land.

d)

The use of wool blanket to keep the body warm.

49.

A group of friends gather around a fire to stay warm. This is an example of ________.

a)

conduction

b)

convection

c)

radiation

50.

Which describes what can happen as a result of radiation?

a)

A piece of wood burns in a fire.

b)

A shirt is hot after having been ironed.

c)

A can of soup is heated in a pot on a stove.

d)

A car’s inside temperature rises to over 100 degrees on a sunny day.

51.

You get sunburned due to __________ from the sun.

a)

conduction

b)

convection

c)

radiation

52.

The kind of heat transfer that travels through space in electromagnetic waves is ______________________.

a)

convection

b)

radiation

c)

conduction

53.

A huge rock at the state park gets so hot during the day because of ________.

a)

conduction

b)

convection

c)

radiation

54.

2. WHICH OF THE FOLLOWING IS A SOURCE OF LIGHT?

a)

the moon

b)

our eyes

c)

fire

d)

a mirror

55.

Why is light able to travel through space when sound cannot?

a)

Light is able to be reflected by objects.

b)

Light is able to travel through gas.

c)

Light is able to travel through a vacuum.

d)

Light is able to travel through translucent objects.

56.

When all of the colors of light are absorbed, we see the color _______.

a)

white

b)

green

c)

black

d)

red

57.
Light travels
a)
around corners
b)
in a straight line
58.
Light bounces when it is 
a)
reflected
b)
absorbed
c)
refracted
59.
Light bends when it is 
a)
refracted
b)
reflected
c)
absorbed
60.
Light is a form of 
a)
Matter
b)
Reflection
c)
Energy
d)
Force
61.

A straw sitting in a glass of water looks broken because light travels more slowly through the water than air. This is an example of ____________.

a)

Reflection

b)

Refraction

c)

Absorbing

d)

Transmitting

62.

This is an example of?

a)

fog

b)

Reflection

c)

Refraction

d)

translucent

63.

Cardboard, wood, and books are some examples of ________ objects.

a)

opaque

b)

translucent

c)

transparent

d)

reflection

64.

When white light passes through a prism, it is broken apart into

a)

water

b)

air

c)

rainbow colors

d)

a straw

65.
True or false: as you move along the spectrum, radio to gamma waves, the wavelengths decrease in size (get smaller)
a)
true
b)
false
66.
A wave with a large wavelength will have a ______ frequency and _____ energy
a)
high, low
b)
high, high
c)
low, high
d)
low, low
67.
Which has the LONGEST wavelength and, therefore, the lowest frequency/energy
a)
Gamma Rays
b)
Radio Waves
c)
Visible Light
d)
Infrared rays
68.
Which section of the spectrum is the ONLY one we can see?
a)
X-rays
b)
Visible Light
c)
Gamma Rays
d)
Ultraviolet Rays
69.
How are electromagnetic waves different from other waves? 
a)
They have very short wavelengths 
b)
They transmit energy instead of matter 
c)
They can travel through empty space
d)
They can change direction by reflection 
70.
The distance between two crests or two troughs of a wave is called:
a)
frequency
b)
amplitud
c)
wavelength
d)
hertz
71.
A rapid back and forth movement?
a)
Echo
b)
Vibrate
c)
Pitch
d)
Amplitude
72.
Energy that you can hear? 
a)
Sound
b)
Light 
c)
Heat 
d)
pitch
73.
When a sound bounces back at you off of a surface
a)
Volume
b)
Pitch
c)
Frequency
d)
Echo
74.
We measure sound in...
a)
Decimals
b)
Decibles
c)
Frequency 
d)
Amplitude
75.
Sound moves in a _________.
a)
Transverse wave
b)
Longitudinal wave
76.
How is sound produced?
a)
By the vibration of particles
b)
By the transfer of particles 
77.
Area of a longitudinal wave where particles are CLOSE together.
a)
Compression
b)
Rarefaction
78.
Area of a longitudinal wave where particles are APART. 
a)
Compression
b)
Rarefaction
79.
Soft surfaces _______ sound waves. 
a)
Reflect
b)
Absorb
80.
Sound travels FASTEST through which of these materials?
a)
Air
b)
Empty space
c)
Metal
d)
Water
81.
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.
82.
Which 2 letters have the most kinetic energy
a)
W & Y
b)
X & Z
83.

Total energy = 200J
Useful energy = 20J

Workout the efficiency of this lightbulb.
 efficiency = useful enegytotal energy in ×100efficiency\ =\ \frac{useful\ enegy}{total\ energy\ in}\ \times100  

a)

100%

b)

80%

c)

40%

d)

10%

84.

Total energy = 350J
Useful energy = 70J

Workout the efficiency of this iphoneX.
 efficiency = useful energytotal energy in ×100%efficiency\ =\ \frac{useful\ energy}{total\ energy\ in}\ \times100\%  

a)

100%

b)

80%

c)

40%

d)

20%

85.

A car transfers 100 J of chemical energy in order to gain 50 J of kinetic energy. The efficiency of the car is

a)

20%

b)

0.5%

c)

50%

d)

200%

86.
What is the efficiency of the machine if the input is 263 J and the output is 142 J? 
a)
6.26%
b)
54%
c)
100%
d)
260%
87.
What is the efficiency of a machine that has work input of 40 joules and work output of 35 joules?
a)
87.50%
b)
1200
c)
1.142
d)
114%
88.

What is the useful work output of a machine that consumes 2,800 Joules and an efficiency of 40%?

a)

7000 J

b)

2760 J

c)

1120 J

89.

What is the value of the wasted energy?

(a)  

90.

As a percentage, what is the efficiency of the bulb represented by the Sankey diagram?

(a)  

91.

Which bulb is the most efficient?

a)

Filament bulb

b)

LED light

c)

CFL lamp

92.

A bulb is 70% efficient. It produces 49 J of light energy. How much energy is inputted?

(a)  

93.

What force causes a roller coaster cart to slow down the most?

a)

friction

b)

weight

c)

gravity

d)

air resistance

94.

What is the energy transformation that occurs in an electric pencil sharpener?

a)

mechanical energy to electrical energy

b)

electrical energy to mechanical energy

c)

radiant energy to sound energy

d)

chemical energy to mechanical energy

95.
what type of energy is stored in a battery?
a)
electrical
b)
chemical
c)
thermal
d)
mechanical
96.

The picture showing the energy conversion

Light → chemical

is:

a)
b)
c)
d)
97.

The picture showing the energy conversion

Chemical → light & heat

is:

a)
b)
c)
d)
98.
Which of the following best describes the energy transformations that occur when a flashlight that runs on batteries is turned on?
a)
chemical → light → electrical
b)
electrical → light → chemical
c)
light → electrical → chemical
d)
chemical → electrical → light
99.
Can you destroy energy?
a)
Yes
b)
No
100.
What kind of energy is in a moving skateboard?
a)
Potential
b)
Kinetic
101.
What kind of energy is in a rock at the edge of a cliff?
a)
Potential
b)
Kinetic
102.
The faster an object moves, the ________ kinetic energy it has. 
a)
more
b)
less
c)
none of the above
d)
all of the above 
103.
An apple hanging from the branch of a tree falls down.  How does its energy change as it falls?
a)
The kinetic energy of the apple converts to potential energy.
b)
The potential energy of the apple coverts to kinetic energy.
c)
The kinetic energy of the apple remains constant.
d)
The potential energy of the apple remains constant.
104.
What kind of energy is represented in the picture?
a)
Thermal
b)
Chemical
c)
Sound
d)
Nuclear

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