Sound - UP Board (UPMSP) STD 8 Science Questions

Q 1M.C.Q. [I MARKS]1 Mark

Which of the following frequency of sound can be generated by a vibrating simple pendulum as well as by the vibrating vocal cords of a rhinoceros?

A
$5 kHz.$
B
$25 Hz.$
✓
$10 Hz.$
D
$15,000 Hz.$

Answer: C.

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Q 2M.C.Q. [I MARKS]1 Mark

A key of mechanical piano is first struck gently and then struck again but much harder this time. In the second case:

✓
Sound will be louder but pitch will not be different.
B
Sound will be louder and the pitch will also be higher.
C
Sound will be louder but pitch will be lower.
D
Both loudness and pitch will remain unaffected.

Answer: A.

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Q 3M.C.Q. [I MARKS]1 Mark

When we change a feeble sound to a loud sound, we increase its:

A
Frequency.
✓
Amplitude.
C
Speed.
D
Timbre.

Answer: B.

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Q 4M.C.Q. [I MARKS]1 Mark

he velocities of sound waves in four media $P, Q, R$ and $S$ are $18,000km/h, 900km/h, 0 km/h$, and $1200km/h$ respectively. Which medium could be a liquid substance?

A
$P.$
B
$Q.$
C
$R.$
✓
$S.$

Answer: D.

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Q 5M.C.Q. [I MARKS]1 Mark

The frequencies of four sound waves are given below. Which of these sound waves can be used to measure the depth of sea?

A
$15,000\ Hz.$
B
$10\ kHz.$
✓
$50\ kHz.$
D
$10,000\ Hz.$

Answer: C.

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Q 6Fill in the blanks: [1 M]1 Mark

Fill in the following blanks with suitable words: Sound which is pleasing to the ear is called $............$ sound.

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Q 7Fill in the blanks: [1 M]1 Mark

Fill in the following blanks with suitable words: Sounds are produced by $............$ objects.

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Q 8Fill in the blanks: [1 M]1 Mark

Fill in the following blanks with suitable words: The unit of frequency is $............$

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Q 9Fill in the blanks: [1 M]1 Mark

Fill in the following blanks with suitable words: The human voice box is called $............$

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Q 10Fill in the blanks: [1 M]1 Mark

Fill in the following blanks with suitable words:The shrillness of a sound is determined by the $............$ of vibration.

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Q 11questions in short. [2 marks ]2 Marks

What is a musical sound? Give two examples of musical sounds.

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Q 12questions in short. [2 marks ]2 Marks

How does sound from a sound producing body travel through air to reach our ears?

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Q 13questions in short. [2 marks ]2 Marks

What is meant by the $(a)$ 'pitch' of sound, and $(b)$ 'quality' of sound$?$

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Q 14questions in short. [2 marks ]2 Marks

Out of a man and a woman:
$a.$ Who has shorter vocal cords$?$
$b.$ Who produces sound of higher pitch$?$

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Q 15questions in short. [2 marks ]2 Marks

By how much will the loudness of a sound change when the amplitude of vibrations is:
$a.$ Doubled?
$b.$ Halved?

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Q 16true or false. [1 M]1 Mark

State whether the following statements are true or false: Noise pollution may cause partial hearing impairment.

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Q 17true or false. [1 M]1 Mark

State whether the following statements are true or false: The lower the frequency of vibration, the higher is the pitch.

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Q 18true or false. [1 M]1 Mark

State whether the following statements are true or false: Sound cannot travel in vacuum.

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Q 19true or false. [1 M]1 Mark

State whether the following statements are true or false: The number of oscillations per second of a vibrating object is called its time-period.

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Q 20true or false. [1 M]1 Mark

State whether the following statements are true or false: Unwanted or unpleasant sound is termed as music.

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Q 21questions in short. [3 marks ]3 Marks

Arrange the following sounds in the order of increasing frequencies $($keeping the sound of lowest frequency first$):$
$a.$ Baby's voice.
$b.$ Man's voice.
$c.$ Woman's voice.

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Q 22questions in short. [3 marks ]3 Marks

Three different vibrating objects produce three types of sounds $X, Y$ and $Z$. The sounds $X$ and $Y$ cannot be heard by a man having normal range of hearing but sound $Z$ can be heard easily. The sound $X$ can be heard by a bat whereas the sound $Y$ can be heard by a rhinoceros. What type of sounds are $X, Y$ and $Z?$

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Q 23questions in short. [3 marks ]3 Marks

Name the part which vibrates to produce sound in the following:
$a.$ Drums.
$b.$ Sitar.
$c.$ Flute.

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Q 24questions in short. [3 marks ]3 Marks

Your parents are going to buy a house. They have been offered one house on the roadside and another house three lanes away from the roadside. Which house would you suggest your parents should buy? Explain your answer.

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Q 25questions in short. [3 marks ]3 Marks

Which of the following is the speed of sound in water and which in steel?
$a. 5000\ m/s.$
$b. 1500\ m/s.$
$c. 340\ m/s.$

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Q 26questions in details [4 marks ]4 Marks

Give any four sources of sound in a market place.

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Q 27questions in details [4 marks ]4 Marks

Give two examples of each of the following:
$a.$ Stringed musical instruments.
$b.$ Wind musical instruments.
$c.$ Membrane musical instruments.
$d.$ Plate type musical instruments.

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Q 28questions in details [4 marks ]4 Marks

Draw a labelled diagram of larynx and explain its functions.

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Q 29questions in details [4 marks ]4 Marks

Describe how sound is produced by the human voice box (or larynx).

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Q 30questions in details [4 marks ]4 Marks

What is meant by noise pollution? Mention some of the sources of noise pollution in your surroundings.

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Q 31questions in on sentence. [1 M]1 Mark

On what factor does the pitch of a sound depend?