Question

6. Noise is produced by

a) vibrations of high frequency

b) regular vibrations

c) vibrations of low frequency

d) irregular vibrations

7. What kind of musical instrument is a sitar?

a) string

b) percussion

c) wind

d) reed

8. What should a drummer do to reduce the pitch of a drum?

a) hit the drum skin with greater force

b) hit the drum skin with less force

c) loosen the drum skin

d) tighten the drum skin

9. Sound waves travel fastest in

a) air

b) solids

c) vacuum

d) liquids

10. The range of audible frequency of the human ear is roughly -

a) 2 Hz to 2000 Hz

b) 20 Hz to 2000 Hz

c) 20 Hz to 20,000 Hz

d) 200 Hz to 20,000 Hz​

Answer 1

Answer:

Correct option is D)

Smooth and periodic vibration is music and irregular and non-periodic vibration is noise.