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B
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100

The main source of light energy on Earth is:

The Sun

100

Things that we dry to last longer are:

fruits, vegetables and salted fish

100

These vehicles use kinetic energy for transportation:

a train , a ship and an airplane

100

Heat energy is produced when objects are .....

rubbed together or when they hit  against one another.

100

Give an example of sound energy used for warnings.  


hearing a police siren

200

What is a use of light energy in this picture?

communicating

200

A snail at the top of the hill has____ energy 

potential

200

Potential energy of the car in the roller coaster is the greatest at this point:

At point (a) the potential energy is the greatest.

200

Heat energy is used to kill .....



germs by cooking food.

200

Give an example of sound energy used for entertainment.

playing musical instruments.

300

Lasers are used for:

cutting metals

300

I conserve electrical energy in my house by:

switching off the lights when I leave my room

300

Define heat energy.

Heat energy is a form of energy that makes things warm or hot.

300

Heat energy is used for __________

boiling water.

300

ultrasound is used in____

helps us to see body parts images.

400

A traffic light is used to:

letting us know when it is safe to cross the road

400

Kinetic energy can be used for recreational activities by:

surfing and windsurfing

400

An electric iron provides useful heat for________.

ironing clothes

400

Give an example of sound energy used for informing.              

responding to phone calls and listening

400

Explain the energy transformation for an electric lamp.

electrical energy to light and heat energy

500

A device that uses light energy to take photos is:

a camera

500

Wind turbines generate electricity by:

using kinetic energy from wind

500

Heat energy is used in the steel-making industry to _____________________  

melt steel

500

Give an example of sound energy used for communicating.


conveying messages through speaking

500

Explain the energy transformation for an electric blender.

electrical to kinetic and sound energy

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