Sound Year 4

Sound is produced by

• Shaken

• Vibration

• Lighten

• Measured

What will happen according to the picture. Choose the right statement

• Sound produced because of bowing

• Sound produces because of clapping

• Sound produced because of knocking

When air inside it vibrated , sound will produce. What is it?

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Diagram shows that Sarah could hear bell ringing from ice cream truck in the street even she in the house. Why Sarah could hear the sound?

• sound is reflected

• sound is refracted

• sound could produce echo

• sound travel to all direction

What will happen when sound reached at a hard surface?

• Sound will be heard

• Sound will reflected

• Sound will vibrate

• Sound will banging

What is the phenomena of sound in this diagram?

• Sonar

• Ultrasound

• Echo

How sound is produce by plucking a guitar?

Among all these object which one will produce the loudest sound when fall from higher place?

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Answer explanation

Sound will reflected when its reach a hard surface in this situation bell ringing will be reflected when reach the ground.

Rina is studying in her class at level 2. But she could hear the voice of teacher speaking with other pupils at the ground level. How this situation could happen?

• Teacher use magnificent glass to speak

• Sound is absorbed by object around it

• Voice will echo and sound travel in all directions

Which one is not the application of reflection of sound

• radar

• sonar

• ultrasound