Reflection of sound

Q. Give three examples for each of the following:
1) Good reflectors of sound
2) Bad reflectors of sound

Q.

How will you verify laws of reflection of sound experimentally?

Q.

Name the principle on which a soundboard works.

Q.

Which of the following is based on reflection of sound?

1. Megaphone

2. Soundboard

3. Stethoscope

4. All of these

Q. Question 17
Why is the ceiling and wall behind the stage of good conference halls or concert halls made curved?

Q.

Give two examples of each:

a. Good reflectors of sound.

b. Bad reflectors of sound.

Q. Question 1
Why are the ceilings of concert halls curved?

Q.

In the following questions, a statement of assertion followed by the reason is given. Choose the correct answers out of the following choices:

Assertion: Sound bounces off a solid or a liquid like a rubber ball bounces off a wall.

Reason: Like light, sound gets reflected at the surface of a solid or liquid and follows the same laws of reflection.

1. Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

2. The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.

3. Assertion is true but the Reason is false.

4. The statement of the Assertion is false but the Reason is true.

5. Both the statements are false.

Q.

Propagation of sound waves follow the laws of reflection.

1. Depends on the source

2. Yes

3. Depends on the medium

4. No

Q.

Explain the uses of the reflection of sound. [3 MARKS]

Q.

While performing an experiment on verifying the laws of reflection of sound, the reflected sound can be detected better by keeping one ear

1. near the end of the tube and keeping the other end closed

2. near the end of the tube and keeping other end open

3. at about 5 cm from the end of the tube and keeping the other end closed

4. at about 5 cm from the end of the tube and keeping the other end open

Q. In a big hall, the sound gets reflected inside the hall multiple times.This phenomenon can be observed in:

1. Auditoriums
2. Cinema halls
3. Indoor stadiums
4. Vacuum chamber

Q.

If a person drops a pebble in a well of $100m$ depth, after how much time (in seconds) will he be able to hear the sound?
Given:
Acceleration due to gravity, $g=10m{s}^{-2}$
Speed of sound in air, $v=343m{s}^{-1}$

1. $20s$

2. $\sqrt{20}+0.3s$

3. $\sqrt{20}s$

4. $0.3s$