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CBSE 8th Standard Science Sound Sample Question Papers Study Material - QB365 Set B

Published on: 29/10/2025

Question Set B

CBSE 8th Standard Science Sound Sample Question Papers Study Material - QB365

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Std: 8th Standard CBSE - Science

chapter: Sound - Sample Question Papers

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Questions:

Multiple Choice Question

10 x 1 = 10

Pitch of sound is determined by its

(a)

frequency

(b)

speed

(c)

amplitude

(d)

loudness

Frequency is expressed in

(a)

hertz

(b)

metre

(c)

Newton

(d)

joule

Vibrations in a body produce

(a)

sound

(b)

pressure

(c)

density

(d)

current

Unwanted sounds are called

(a)

noise

(b)

music

(c)

Both (a) and (b)

(d)

None of these

Which of the following statements are correct?
(i) Sound is produced by vibrations.
(ii) Sound requires a medium for propagation.
(iii) Light and sound both require a medium for propagation.
(iv) Sound travels slower than light

(a)

(i) and (ii)

(b)

(i), (ii) and (iii)

(c)

(ii), (iii) and (iv)

(d)

(i), (ii) and (iv)

The loudness of sound depends on

(a)

its amplitude

(b)

its time period

(c)

its frequency

(d)

its speed

The hearing range of human ear is

(a)

20 Hz to 20 kHz

(b)

less than 20 Hz

(c)

more than 20 kHz

(d)

20 Hz to 25,000 Hz

A list of mediums is given below
(i) Wood
(ii) Water
(iii) Air
(iv) Vacuum
In which of these mediums can sound travel?

(a)

(i) and (ii)

(b)

(i), (ii) and (iii)

(c)

(iii) and (iv)

(d)

(ii), (iii) and (iv)

Voice of which of the following is likely to have minimum frequency?

(a)

Baby girl

(b)

Baby boy

(c)

A man

(d)

A woman

10.

Sound can travel through

(a)

gases only

(b)

solids only

(c)

liquids only

(d)

solids, liquids and gases

True or False

5 x 1 = 5

11.

Nobody can hear sounds of frequencies higher than 20,000 Hz.

(a)

True

(b)

False

12.

Sound makes eardrum vibrate.

(a)

False

(b)

True

13.

Man cannot hear the sound of bats.

(a)

False

(b)

True

14.

The frequency is expressed in metre (m).

(a)

True

(b)

False

15.

Sound cannot travel in vacuum

(a)

True

(b)

False

Fill up / 1 Marks

5 x 1 = 5

16.

The other name of human voice box is............

17.

Sound is produced by...............objects.

18.

Shrillness of a sound is determined by the..........of vibration

19.

The unit of frequency is..........

20.

Time taken by an object to complete one oscillation is called..........

Generic 3

2 x 3 = 6

21.

Lightning and thunder take place in the sky at the same time and at the same distance from us. Lightning is seen earlier and thunder is heard later. Can you explain why?

22.

What is the difference between noise and music? Can music become noise sometimes?

Generic 2

2 x 2 = 4

23.

Name two musical instruments which produce sound by vibrating strings.

24.

Does any part of our body vibrate when we speak? Name the part.

Match the following

5 x 1 = 5

25.

Hertz

26.

Eardrum

27.

Audible

28.

Pleasant sound

29.

Ultrasonic waves

Generic 5

3 x 5 = 15

30.

How can noise pollution be controlled?

31.

Puzzle:
Across:
1. A complete frequency.
2. Unit of frequency.
3. A thin stretched membrane in the ear.
4. Pleasant sound

Down:
5. Frequency determines it
6. Hearing range
7. Unpleasant sound
8. More than 20,000 Hz range

32.

Sketch larynx and explain its function in your own words

1 Marks

5 x 1 = 5

33.

What is the hearing range of human ears?

34.

On which factor does loudness of sound depend?

35.

Which animal can hear sounds of frequencies higher than 20,000 Hz?

36.

What is the other name of voice box?

37.

Define sound.

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Answers Key:

Multiple Choice Question

10 x 1 = 10

(a)
frequency

(a)
hertz

(a)
sound

(a)
noise

(d)
(i), (ii) and (iv)

(a)
its amplitude

(a)
20 Hz to 20 kHz

(b)
(i), (ii) and (iii)

10.

(d)
solids, liquids and gases

True or False

5 x 1 = 5

11.

(b)
False

12.

(a)
False

13.

(a)
False

14.

(b)
False

15.

(a)
True

Fill up / 1 Marks

5 x 1 = 5

16.

()
larynx

17.

()
vibrating

18.

()
frequency

19.

()
hertz

20.

()
time period

Generic 3

2 x 3 = 6

21.

Lightning is seen earlier than the sound of thunder because light travels faster than sound. Hence, it reaches us before the sound does.

22.

Noise	Music
It is unpleasant sound	It is pleasant sound
It leads to noise pollution	No such pollution takes place
It is hazardous to health	It is good for health
No special instruments are required to produce noise	Special instruments are required to play music

Yes, music becomes noise sometimes, when it crosses the bearable range of sound for the ears.

Generic 2

2 x 2 = 4

23.

Guitar and sitar are the two musical instrumenls which produce the sound by vibrating string.

24.

Yes, while speaking the part which vibrates is called vocal cords. It is below the throat and creates vibrations while speaking.

Match the following

5 x 1 = 5

25.

()
Unit of frequency

26.

()
Voce box on this

27.

()
20 Hz to 20,000 Hz

28.

()
Music

29.

()
More than 20 kHz

Generic 5

3 x 5 = 15

30.

Presence of excessive noise in the surrounding may cause noise pollution, which is harmful to human health. Here are some measures to limit noise pollution:
(i) Noise producing industries should be set up away from residential areas.
(ii) Silencing devices must be installed in aircraft engines, transport vehicles, industrial machines and heavy appliances.
(iii)Use of automobile horn should be minimized.
(iv) TVand music system should be run at low volumes.
(v) Trees must be planted along the sides of the roads and around buildings to cut down the sounds reaching the residents

31.

Across:
1. Oscillation
2. Hertz
3. Eardrum
4. Music
Down:
5. Pitch
6. Audible
7. Noise
8. Ultrasonic

32.

In humans, the sound is produced by the voice box or the larynx. Put your fingers on the throat and find a hard bump that seems to move when you swallow. This part of the body is known as the voice box. Belowit is the windpipe. Two vocal cords, are stretched across the voice box or larynx in such a way that it leaves a narrow slit between them for the passage of air

When the lungs force air through the slit, the vocal cords vibrate, producing sound. Muscles attached to the vocal cords may make the cords tight or loose. When the vocal cords are tight and thin, the type or quality of voice is different from that when these are loose and thick.