Question

1. which of the following is a good sound absorber
a.Glass b.water c.Thermocol d.vacuum

2. which of the following concept is used in SONAR to find the depth of oceans
a. musical sound . b. echoes c. dissonance d.noice

3.mininum distance required to hear an echo is nearly
a. 170m b.18m c.19m d.17m

4.musical sounds are caused due to
a.regular vibration b.irregular vibration c. both a and b d. none of these

5.loudness of sound depends on
a.the wavelength b.volume of air around the vibrating body c.time d.none of these

Answer 1

1. A. glass
2.b. echoes
3.b. 18 m.
4.a. regular vibration
5.d. none of these

Answer 2

1) Glass is a good sound absorber because it has a tendency to reflect the sound back.

2) Echoes are used in SONAR to find the depth of the oceans. It can also refer to the "hydroacoustic" echo founder.

3) The minimum distance required to hear an echo is more than 17.2m approximately 18m.

4) Musical sounds are caused due to regular vibrations for example sound of musical instruments.

5) For this question the answer is d) none of the above.

Actually, the loudness of a sound depends on the amplitude of the vibration producing that sound.