Quiz about Year 8 Physics - Energy

Question 1

What is energy?

Accepted Answer

The ability to do work.

Answer

moving energy

Answer

stored energy

Answer

renewable energy

Question 2

Energy of motion is which type of energy?

Accepted Answer

Kinetic

Answer

Potential

Answer

Sound

Answer

Gravitational

Question 3

Work is:

Accepted Answer

A transfer of energy by a force to move and object

Answer

Something you get paid for

Answer

Something you take home

Answer

Makes you sweat

Question 4

The law of conservation of energy states energy cannot be:

Accepted Answer

Destroyed

Accepted Answer

Created

Answer

Transformed

Answer

Transferred

Question 5

What type of energy is in this picture?

Accepted Answer

Potential

Answer

Kinetic

Answer

Chemical

Answer

Sound

Question 6

What kind of energy is represented in this picture?

Accepted Answer

Thermal

Answer

Potential

Answer

Nuclear

Answer

Mechanical

Question 7

When plants convert the sun's energy into food, which type of energy is it?

Accepted Answer

chemical

Answer

kinetic

Answer

thermal

Answer

radiant

Question 8

What kind of energy does this device use?

Accepted Answer

Electrical

Answer

Chemical

Answer

Thermal

Answer

Chemical

Question 9

What kind of energy is represented in the picture?

Accepted Answer

Chemical

Answer

Thermal

Answer

Sound

Answer

Nuclear

Question 10

The glow sticks produce light for a short amount of time. The light from the glow stick is a conversion from what to what?

Accepted Answer

chemical to light

Answer

thermal to light

Answer

gravitational to potential

Answer

radiant to electrical

Question 11

Wind turbines and windmills convert what energy to another?

Accepted Answer

Kinetic to electric

Answer

Gravitational potential to electric

Answer

Mechanical to potential

Answer

Thermal to sound

Question 12

What units are used to measure energy?

Accepted Answer

Joules

Answer

Watts

Answer

Newtons

Answer

kilowatts

Question 13

On a roller coaster, where is maximum potential energy?

Accepted Answer

At the top of a big hill

Answer

At the bottom of a big hill

Answer

When going around a corner

Answer

When going upside down

Question 14

You and your family are sitting around a campfire.  You can feel the heat on your face, even when you back your seat away from the fire.  The heat energy from the fire warms your face through:

Accepted Answer

radiation

Answer

light energy from the fire

Answer

conduction

Answer

chemical reactions in the fire

Question 15

Warm air rises and cool air sinks due to...

Accepted Answer

Convection

Answer

Radiation

Answer

Conduction

Question 16

When your feet touch the hot pavement, heat is transferred to your feet through...

Accepted Answer

Conduction

Answer

Radiation

Answer

Convection

Question 17

which of these have kinetic energy?

Accepted Answer

a car rolling along the road

Answer

a rock on top of a hill

Answer

an archer's bow drawn back

Answer

a bicycle sitting at a stop sign

Question 18

Energy stored in the nucleus of an atom is called

Accepted Answer

nuclear energy

Answer

electromagnetic energy

Answer

mechanical energy

Answer

chemical energy

Question 19

What do we call a change from one form of energy to another?

Accepted Answer

Energy transformation

Answer

Energy change

Answer

Energy creation

Question 20

When Becky dances, she moves her arms and legs, she sings and she gets hot. What is the source of energy input for her dancing?

Accepted Answer

Chemical energy

Answer

Kinetic energy

Answer

Heat energy

Answer

Sound energy

Question 21

When Becky dances, she moves her arms and legs, she sings and she gets hot. Which type of energy is produced when Becky dances?

Accepted Answer

All of the above

Answer

Kinetic energy

Answer

Sound energy

Answer

Heat energy

Question 22

When filled with hot liquid, a metal cup feels hotter on the outside than a styrofoam cup. This is because:

Accepted Answer

Metal is a better conductor than styrofoam.

Answer

Styrofoam is a better conductor than metal.

Answer

Metal is a better insulator than styrofoam.

Answer

They both conduct heat equally.

Question 23

A teacher rubbed a match against a piece of sandpaper. The match started to burn. Which statement best describes the energy changes that occurred?

Accepted Answer

The chemical energy stored in the match changed to thermal energy and radiant energy.

Answer

The thermal energy stored in the match changed to radiant energy and chemical energy.

Answer

The radiant energy and thermal energy stored in the match changed to mechanical energy.

Answer

The radiant energy and thermal energy stored in the match changed to chemical energy.

Question 24

The graph shows a ball rolling from A to G. At what location would the ball have the highest amount of Kinetic Energy?

Accepted Answer

D

Answer

A

Answer

C

Answer

E

Question 25

The graph shows a ball rolling from A to G. At what location would the ball have the lowest amount of Potential Energy?

Accepted Answer

D

Answer

A

Answer

C

Answer

G

Question 26

Define energy efficiency.

Accepted Answer

The proportion of total energy that is converted to useful energy.

Answer

The proportion of useful energy that is converted to waste energy.

Answer

The proportion of total energy that is converted to waste energy.

Question 27

A washing machine uses 250J of electrical energy to produce 125J of useful energy. How efficient is it?

Accepted Answer

50%

Answer

5%

Answer

55%

Answer

100%

Question 28

A hairdryer uses 300J of energy to produce 60J of sound energy and 240J of thermal energy. Calculate it's efficiency.

Accepted Answer

80%

Answer

90%

Answer

20%

Answer

100%

Question 29

A hairdryer uses 300J of energy to produce 60J of sound energy and 240J of thermal energy. Calculate it's efficiency.

Accepted Answer

80%

Answer

90%

Answer

20%

Answer

100%

Question 30

A cake mixer uses 48 J of electrical energy. 22 J is converted to kinetic energy, 9 J is released as sound and 17 J is released as heat. What is the useful energy output?

Accepted Answer

Kinetic

Answer

Sound

Answer

Heat

Answer

Electrical

Question 31

A cake mixer uses 48 J of electrical energy. 22 J is converted to kinetic energy, 9 J is released as sound and 17 J is released as heat. Calculate the efficiency of the cake mixer. Give the energy efficiency rounded to the nearest percentage.

Accepted Answer

46%

Answer

35%

Answer

19%

Answer

100%

Question 32

Where does most of the energy go in this transformation.

Accepted Answer

Heat

Answer

Electrical energy

Answer

Light

Answer

other

Question 33

Where does most of the energy go for this transformation.

Accepted Answer

light

Answer

heat

Answer

electrical

Answer

joules

Question 34

Which of the following forms of energy is the useful form of energy in the sankey diagram above?

Accepted Answer

Kinetic

Answer

Sound

Answer

Heat

Answer

Both sound and heat

Question 35

Which of the following forms of energy is the waste form of energy in the sankey diagram above?

Accepted Answer

Heat

Accepted Answer

Sound

Answer

Kinetic

Answer

Elastic Potential

Question 36

In the energy transfer indicated in this Sankey diagram, what type of energy is the waste energy?

Accepted Answer

Thermal

Answer

Electrical

Answer

Sound

Answer

Light

Question 37

In the energy transfer indicated in this Sankey diagram, what type of energy is the useful energy?

Accepted Answer

Sound

Accepted Answer

Light

Answer

Electrical

Answer

Thermal

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