SCIENCE YEAR 4 : SOUND

What is sound?

• Sound is produced by vibrations

• Sound is produced by songs

• Sound is produced by humans

• Sound is produced by machines

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How the sound is produced?

• By knocking

• By talking

• By blowing

• By clapping

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When the flute is blown, the air inside the flute vibrates. It is called..

• Plucking

• Bowing

• Blowing

• Clapping

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Why Ilhan, Qaid and Atiqah can hear the sound of the bell ringing from an ice cream seller even though they are at different positions?

• Because the sound of the bell is too loud.

• Because they are too near to the ice cream seller.

• Because they can smell the ice creams.

• Because the sound travels in all directions.

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Iris and her family just moved into a new house. As she speaks in the empty room, she hears her own voice again. Why?

• Because of the echo.

• Because of the ultrasonic sound

• Because she speaks too loud

• Because she is using the sonar technology.

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What technology does the deep sea fishermen use to detect object in water?

• Ultrasound

• Sonar

• Echo

• Radar

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Useful effects of sound..

• Allow us to communicate

• Indicates emergency alert.

• Can cause hearing problems

• Cause disturbance and stress

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Airport ground staffs use ____________ to prevent ear damage from excessive aircraft noise.

• ear plugs

• ear protectors

• a head scarf

• a helmet

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Hakim loves to listen to music. However, he is disturbed by the loud music coming from his neighbour's house.

Tick to explain the effects of the sound above

• Sound helps to communicate

• Sound is entertaining

• Sound provides alertness

• Sound causes disturbance

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The properties of sound are...

• Sound can be absorbed.

• Sound can be reflected.

• Sound travels in a straight line.

• Sound travels in all directions.

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