Grade 7 Science: Sound Reflections Quiz

What is an echo?

• A sound that gets louder as it travels

• A sound that is absorbed by a surface

• A sound that reflects off a surface and returns to the listener

• A sound that travels only through air

Which surface is most likely to reflect sound?

• Soft fabric

• Thick carpet

• Smooth, hard wall

• Open air

What is the correct active form of the verb reflect?

• The sound is reflected by the wall.

• The wall reflects the sound.

• The sound reflects onto the wall.

• The wall is reflecting the sound onto the trumpet.

Why do bats rely on sound reflections to find food?

• They see their food better in the dark

• They detect sound waves reflected from insects

• They make sounds that bounce off walls

• They can hear echoes of other animals

Which statement is true about sound reflection?

• Soft surfaces reflect sound better than hard surfaces

• Sound reflects better off rough surfaces

• Smooth surfaces reflect sound in different directions

• Smooth, hard surfaces reflect sound well

Sound can be reflected by both solid and liquid surfaces.

• TRUE

• FALSE

Softer materials like carpets and curtains are good reflectors of sound.

• TRUE

• FALSE

An echo is heard when reflected sound waves return to the listener's ears after a delay.

• TRUE

• FALSE

Describe what happens when sound reflects off a wall.

• Sound disappears completely upon hitting the wall.
• Sound reflects off a wall, creating echoes and following the law of reflection.
• Sound passes through the wall without any change.
• Sound is absorbed by the wall, creating silence.

Choose an example of a situation where sound reflection is helpful.

• Using headphones to block noise.
• Soundproofing in recording studios.
• Echolocation in bats and dolphins.
• Sound waves traveling through a vacuum.