Questions :-

1. What is unpleasant sound called?
(a) Noise
(b) Sweet sound
(c) Both
(d) None of these

2. Presence of unwanted and excessive sound in the environment produces _______________
(a) Air pollution
(b) Water pollution
(c) Sound pollution
(d) None of these

3. How many parts have human ear?
(a) Two
(b) Three
(c) Four
(d) One

4. What is the frequency range of inaudible sound?
(a) Less than 20 Hz
(b) 20 Hz
(c) 20 – 20,000 Hz
(d) None of these

5. Sound frequencies which cannot be detected by human ear are called __________
(a) Audible frequency
(b) Inaudible frequency
(c) Ultra audible frequency
(d) None of these

6. Sound frequencies which can be detected by human ear are called __________
(a) Audible frequency
(b) Inaudible frequency
(c) Ultra audible frequency
(d) None of these

7. The sound which is pleasing for the ear are called ___________
(a) Lonely sound
(b) Solo sound
(c) Echo
(d) Musical sound

8. Drum vibrates with a __________ frequency so they are called low pitch sound.
(a) High
(b) Low
(c) Equal
(d) None of these

9. Shape of the outer part of the ear is like __________
(a) Funnel
(b) Elephant ear
(c) Both of these
(d) None of these

10. The repeated motion in which an object repeats the same movement over and over are called _____________
(a) Oscillatory motion
(b) Rolling motion
(c) Static motion
(d) Sliding motion