SC Y4 DLP UNIT 6-SOUND

The object below produces sound by

• Blowing

• Shaking

• Bowing

• Knocking

The object below produces sound by

• blowing

• bowing

• plucking

• pressing

The diagram shows a type of animal. How does the animal detect a location and move in a certain direction?

• Echo

• Ultrasonic

• Clapping

• Sonar

A man is giving a speech on the stage in front of a big audience. The voice can be heard by all the audience because

• sound travel in a straight line

• sound travels in all directions

• sound is reflected in all directions

• sound travels in one direction

Which of the following statements is correct?

• Sound cannot travel in a straight line

• Sound cannot be refracted

• Sound can be reflected

• sound cannot travel through air

Which surface is a good reflector of sound?

• Hard and smooth

• soft and smooth

• soft and rough

• Hard and rough

How does a lost boy scout use a bottle to send signal to his friends?

• Knock the bottle to a stone to produce sound

• Use the bottle to reflect the sunlight

• Blow the bottle to produce loud sound

• Use the bottle to disperse the sunlight

The diagram shows an airport staff wearing an ear protector. Why does the staff wear the

ear protector?

• To reduce the sound

• To protect the ears from loud sound of the aeroplane

• To communicate

• To reduce stress

The diagram shows Catherine's hobby.

What is the effect of this hobby on Catherine in a long term?

• The music is entertaining

• Cause emotional stress

• Hearing problem

• Protect the ears