CBSE class 8 sound - Assessment

1.

Multiple Choice

30 sec

1 pt

Sound is caused by:

waves.

vibrations.

heat.

air.

2.

Multiple Choice

30 sec

1 pt

Elephants can make sounds of high intensity. These sounds will be:

quiet.

high.

soft.

loud.

3.

Multiple Choice

30 sec

1 pt

The tweeting sound made by a small bird has a pitch that is:

soft.

high.

low.

quiet.

4.

Multiple Choice

30 sec

1 pt

Frequency:

is the amplitude of the vibrations.

is measured in metres.

is the number of vibrations each second.

affects how loud a sound is.

5.

Multiple Choice

30 sec

1 pt

Sound cannot travel though empty space because:

air particles stay still.

there are no particles to vibrate.

particles pass on vibrations.

electricity sends it through the air.

6.

Multiple Choice

30 sec

1 pt

Which list is in the correct order to show the speed of sound in different materials, starting with the slowest?

solids, liquids, gases

solids, gases, liquids

gases, liquids, solids

liquids, solids, gases

7.

Multiple Choice

30 sec

1 pt

What do all waves transfer?

energy only

energy and matter

matter only

energy and particles

8.

Multiple Choice

30 sec

1 pt

What is the amplitude of a sound wave?

its loudness

the maximum distance the particles vibrate away from their starting positions when the wave passes

the height of the vibrations

how high or low the sound is.

9.

Multiple Choice

30 sec

1 pt

The ear changes sound waves into:

light.

nerves.

nerve impulses.

heat.

10.

Multiple Choice

30 sec

1 pt

Which part of the ear changes sound vibrations into signals sent to the brain?

the cochlea

the eardrum

the auditory nerve

the small bones

11.

Multiple Choice

30 sec

1 pt

Which of the following statements is not correct?

infrasounds are sounds with frequencies too low for humans to hear

ultrasounds are sounds that are too high for humans to hear

humans have a greater auditory range than dogs

some animals can hear higher pitched sounds than humans can

12.

Multiple Choice

30 sec

1 pt

Soundproofing works when:

windows in a room are left open.

sounds pass easily through the walls.

sounds are absorbed by certain materials.

the walls in a room are painted black.

13.

Multiple Choice

30 sec

1 pt

A loud sound is produced by waves with:

a high pitch.

a high frequency.

a large amplitude.

a small amplitude.

14.

Multiple Choice

30 sec

1 pt

Look at these drawings of waves. Which statement is true?

Y has the highest amplitude.

Y has the longest wavelength.

X has the highest frequency.

Y has the highest frequency.

15.

Multiple Choice

30 sec

1 pt

The pitch of a sound is:

how high or low it sounds.

how loud or quiet it it.

how much energy it carries.

how long the sound lasts.

16.

Multiple Choice

30 sec

1 pt

Sound travels fastest in solid materials which have particles that are:

wide apart.

close together.

very hot.

able to move around freely.

17.

Fill in the Blank

1 min

1 pt

Audible sound range

18.

Fill in the Blank

1 min

1 pt

Infrasonic sound range

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