I. Choose the correct answer:
1. The voice box is also called as
(a) stomach (b) heart (c) larynx (d) mouth
2.Sound is a kind of
(a) work (b) energy(c) force (d) pressure
3. The hearing range of human ear is
(a) 20 Hz to 20,000 Hz (b) less than 20 Hz (c) more than 20,000 Hz (d) 20 Hz to 25,000 Hz
4. Pitch of sound is determined by its
(a) frequency (b) speed (c) amplitude (d) loudness
5. The frequency of subsonic sound is
(a) more than 20 Hz (b) 100 Hz (c) less than 20 Hz (d) more than 20,000 Hz
6. Cochlea is a part of
(a) hearing organ (b) sound producing organ(c) muscular organ (d) air pollution
7. Sound cannot travel through
(a) air (b) water (c) air (d) vacuum
8.The sound in the audible range is called
(a) ultrasonic sound (b) sonic sound (c) subsonic sound (d) light sound