Q. Fill in the following blanks with suitable words:
(a) Sounds are produced by ___objects.
(b) The human voice box is called___
(c) Sound cannot travel in___
(d) A set of three ___tiny in the middle part of ear passes on sound vibrations from the eardrum to the liquid in cochlea.
(e) The unit of frequency is___
(f) The timet taken by an object to complete one oscillation is called ___
(g) The shrillness of a sound is determined by the___ of vibration.
(h) Unpleasant sound is called___
(i) Sound which is pleasing to the era is called___ sound
(j) A person having partial hearing loss can hear properly by wearing a device called hearing___ on the ear.