Question

few questions n answers related to the topic 'Sound'
pls tell it's urgent

Answer 1

what is sound ?
how does it move ?
what does it use ?

Answer 2

hi
1. Sound is produced due to
a. friction
b. circulation
c. vibration
d. refraction
answer : c

2. The amplitude of a wave is ______.
a. the distance the wave moves in one second
b. the distance the wave moves in one time period of the wave
c. the maximum distance moved by the medium particles on either side of the mean position
d. the distance equal to one wave length 
Answer:   c

3. The frequency which is not audible to the human ear is
a. 50 Hz
b. 500 Hz
c. 5000 Hz
d. 50000 Hz 
Answer:   d

4.The persistence of audible sound due to the successive reflections from the surrounding objects even after the source has stopped to produce that sound is called _________.
a. reflection
b. echo
c. reverberation
d. rarefaction
 Answer:   c

5. Vibrations inside the ear are amplified by the three bones namely the _________ in the middle ear.
a. hammer, anvil and stirrup
b. hammer, anvil and pinna
c. hammer, cochlea and stirrup
d. auditory bone, anvil and stirrup 
Answer:   a

here r 5 questions u can also change it to questions and answers..
hope it helps..