Reverberation

Q. Question 15
What is reverberation? How can it be reduced?

Q.

What are infrasonic sounds?

Q.

What is a stethoscope ? Name the principle on which a stethoscope works.

Q.

What is a megaphone ? Name the principle on which a megaphone works.

Q.

What is reverberation? How can it be reduced?

Q. Question 10
Does sound follow the same laws of reflection as light does? Explain.

Q.

How is sound measured?

Q.

How can reverberations in a big hall or auditorium be reduced ?

Q.

What is reverberation ? What will happen if the reverberation time in a big hall is too long ?

Q.

What is a bulb horn ? Name the principle on which a bulb horn works.

Q.

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

1. Echo

2. Reflection

3. None of these

4. Reverberation

Q.

Why do we hear more clearly in a room with curtains than in a room without curtains ?

Q.

If there is an explosion on Moon, will it be visible or audible or both on earth? Explain. [3 MARKS]

Q. The time taken by two consecutive compressions or rarefactions to cross a fixed point is called the _____

1. wavelength
2. amplitude
3. frequency
4. time period

Q.

Why is the ceiling and wall behind the stage of a good conference hall for a concrete hall made curved?

Q.

Why do good conference halls and music halls have curving ceilings and walls behind the stage?

Q.

Name two sound absorbing materials (or objects) which can make our big room less echoey.

Q. How does sound of a heart beat reaches the doctor's ears with the help of a stethoscope?

1. Due to single reflection of sound.
2. Due to refraction of sound.
3. Due to multiple reflection of sound.
4. Due to production of an echo.

Q.

What name is given to the persistence of sound in a big hall or auditorium ?

Q. You must have seen the doctor checking the sounds produced in the chest of a patient using medical instrument called stethoscope. On what principle does this stethoscope works?

1. Multiple reflections
2. Single reflection
3. Absorption
4. Beats formation

Q. Question 15
What is reverberation? How can it be reduced?

Q.

What happens if the reverberation time is too high?

1. The sound becomes infrasonic

2. The frequency becomes high

3. The sound becomes inaudible

4. Echoes are produced

Q.

To reduce reverberations, the roofs and walls of the auditorium are

1. Both of these

2. None of these

3. Covered with rough plaster

4. Covered with draperies

Q.

The persistence of sound in a closed enclosure, due to continuous reflection at the walls, even after the source has stopped producing sound known as:-

1. The persistence of hearing

2. An echo

3. A reverberation

4. The water sound

Q.

What is reverberation?

1. Multiple reflections that result in persistence of sound.

2. Single reflections that does not result in persistence of sound.

3. Single reflections that result in persistence of sound.

4. Multiple reflections that does not result in persistence of sound.

Q. The persistence of sound because of multiple reflections is called ________.

1. sonography
2. ultrasonography
3. reverberation
4. echolocation

Q.

A ticking clock sound is heard late when heard through a metal.

1. True
2. False

Q. Why are the roof and walls of an auditorium covered with sound-absorbing materials?

1. To increase the echo
2. To increase the sound's loudness
3. To control the sound's frequency
4. To reduce multiple reflections

Q.

Why are ceiling and walls behind the stage of good conference halls or concert halls made curved?

Q.

A man is kidnapped, blindfolded and imprisoned in a big room. How could the man tell if he was in :

(a) a city

(b) a village

(c) a bare room

(d) a furnished room ?