Grade 4 - Unit 4 Revision

What do we call the object/place where a sound is originated from?

• Pitch

• Source

• Sound

How do we hear sounds? Explain how sound reaches our ears.

Which of the following is not a material which sound can travel through?

• Wood

• Glass

• Vacuum

Name the three states of matter which sound travels through.

Through which of the following states does sound travel the fastest?

• Solid

• Liquid

• Gas

Is the following statement true or false?

Sound travels the slowest through air.

• True

• False

Explain why sound travels faster through solids than through air.

Complete the following statement.

Sound is produced due to ___________.

• wind

• pitch

• vibrations

Complete the following sentence.

The __________ the vibrations are, the higher the pitch of sound.

• Faster

• Slower

Is the following statement true or false?

The faster the vibrations are the lower the pitch is.

• True

• False