MEDIUM
Lower Secondary Stage 8
IMPORTANT
Earn 100

The diagram shows a metal ruler attached to a table, so that half of the ruler sticks out over the edge. Lily finds she can make a sound by bending the ruler at the end and releasing it.

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Describe the steps in the process that causes a sound to be made.

Important Questions on Sound

MEDIUM
Lower Secondary Stage 8
IMPORTANT
Cambridge Lower Secondary Science Stage 8 : Workbook>Chapter 8 - Sound>Exercise 1>Q 8

Look at the diagram. An electric circuit including a buzzer is set up inside a glass tank.

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Mia switches the circuit on so the buzzer makes a loud noise. She then switches on a pump that gradually pumps the air out of the tank. Mia observes that the sound gets quieter until she cannot hear the sound at all. Explain Mia’s observations.

MEDIUM
Lower Secondary Stage 8
IMPORTANT
Cambridge Lower Secondary Science Stage 8 : Workbook>Chapter 8 - Sound>Exercise 2>Q 1

Look at the diagram of a human ear. Complete the diagram by writing in the labels. Use words from the list below. The first label has been completed for you.

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[ear canal, eardrum, ossicles, nerve]

MEDIUM
Lower Secondary Stage 8
IMPORTANT
Cambridge Lower Secondary Science Stage 8 : Workbook>Chapter 8 - Sound>Exercise 2>Q 2
Explain how sounds can damage our ears.
EASY
Lower Secondary Stage 8
IMPORTANT
Cambridge Lower Secondary Science Stage 8 : Workbook>Chapter 8 - Sound>Exercise 2>Q 3
Choose which of these activities should only be carried out if we wear ear protection.
EASY
Lower Secondary Stage 8
IMPORTANT
Cambridge Lower Secondary Science Stage 8 : Workbook>Chapter 8 - Sound>Exercise 2>Q 4
Choose the correct estimate of the speed of sound in air.
MEDIUM
Lower Secondary Stage 8
IMPORTANT
Cambridge Lower Secondary Science Stage 8 : Workbook>Chapter 8 - Sound>Exercise 2>Q 5
Describe what happens when we hear an echo.
MEDIUM
Lower Secondary Stage 8
IMPORTANT
Cambridge Lower Secondary Science Stage 8 : Workbook>Chapter 8 - Sound>Exercise 2>Q 8
Engineers testing steel rails can use a microphone to record the sounds of an approaching train. The microphone records the sound of an approaching train for many seconds before the engineers can hear it themselves. The results are shown on an oscilloscope screen. Use your knowledge of the speed of sound to explain what the engineers observe.
MEDIUM
Lower Secondary Stage 8
IMPORTANT
Cambridge Lower Secondary Science Stage 8 : Workbook>Chapter 8 - Sound>Exercise 2>Q 9
Bats use sound to steer around obstacles in the dark. The bats produce sounds to bounce off objects. The diagram shows the face of a horseshoe bat.

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Suggest why this bat’s face is shaped this way.