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Quality of Sound

Fill in the b...

Question

Fill in the blanks .

(a) Sound is generated by the rhythmic ............. of an object.

(b) The frequency of sound is measured in ............... .

(c) If ............. of sound is decreased , its loudness also decreases.

(d) A medium is necessary for .................... of sound.

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Solution

(a) Sound is generated by the rhythmic vibration of an object.

(b) The frequency of sound is measured in Hertz (Hz).

(c) If amplitude of sound is decreased, its loudness also decreases.

(d) A medium is necessary for propagation of sound.

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Q. Question 5
In order to reduce the loudness of a sound we have to

(a) Decrease its frequency of vibration of the sound.
(b) Increase its frequency of vibration of the sound.
(c) Decrease its amplitude of vibration of the sound.
(d) Increase its amplitude of vibration of the sound.

Fill in the following blanks with suitable words :

(a) An echo is simply a ___ sound .

(b) Pitch of sound depends on ___ .

(c) Loudness of sound depends on ___ .

(d) Quality of sound depends on ___ .

(e) Echoes are caused by the ___ of sound .

Q. Fill in the following blanks with suitable words :
(a) An echo is simply a ................... sound.
(b) Pitch of sound depends on ....................
(c) Loudness of sound depends on .....................
(d) Quality of sound depends on ........................
(e) Echoes are caused by the ...................... of sound.

(a) What is meant by the 'loudness' of sound ? On what factor does the loudness of a sound depend ?

(b) Draw labelled diagrams to represent (a) soft sound, and (b) loud sound, of the same frequency.

Q. Mark the following statements true or false. Rewrite the false statements correctly.
(a) Sound has three properties-loudness, frequency and quality.
(b) A sound with large amplitude is louder than one with small amplitude.
(c) The loudness of sound is measured in hertz.
(d) Shortening the string of a guitar lowers its pitch.
(e) The eardrum vibrates when sound waves enter the ear.
(f) Frequency is the number of vibrations per second.
(g) Echoes are produced by the absorption of sound.
(h) Sound travels fastest in solids.
(i) The quality of sound produced by all stringed instruments will be the same.
(j) Radha tightens the string of her veena to raise the pitch of sound.

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