The eardrum vibrates when sound hits it.

Q.

We hear sound only when the sound hits the eardrum and it ___.

Q. When a flute is blown, the air inside it gets compressed and produces sound but does not vibrate. True or false.

Q. Musical sound is produced by periodic vibrations.(True/False)

Q. Only vibrating bodies produce sound. State true or false

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.