Sound

Q.

Distinguish between loudness and intensity of sound.

Q.

A big explosion on the Moon cannot be heard on the Earth. Which of the following statement is the correct explanation for this?

1. The explosion produces high frequency sound waves which are inaudible.

2. Sound waves require a material medium for propagation.

3. Sound waves are absorbed in the moon’s atmosphere.

4. Sound waves are absorbed in the earth’s atmosphere.

Q. What is the energy conversion in a microphone?

Q.

Why the stringed instruments are provided with hollow boxes?

Q.

What is the loud sound that we hear during lightning?

Q.

If you shout on the moon, will the sound travel faster or slower than on earth? Why?

Q.

Sound is produced by ______ bodies.

1. Mutating

2. Stationary

3. Vibrating

4. Motionless

Q.

Does a metal roof block EMF

Q.

What is music in sound?

Q.

The sound travels fastest in ______.

1. Water

2. Solid object

3. Vacuum

4. Gas

Q.

Guitar and violin are both stringed instruments . What is the basic difference in playing these two instrumenys

Q.

The sound produced on the earth can be heard on the moon.

1. Solid

2. Gas

Q. Before playing the orchestra in a musical concert, a sitarist tries to adjust the tension in the string suitably. By doing so, he is adjusting:

1. Intensity of sound
2. Amplitude of sound
3. Loudness of sound
4. Pitch of sound

Q.

A sound produced by the mixture of several frequencies is called______.

1. Tone

2. Note

3. Pitch

4. Echo

Q.

The characteristic property of human ear due to which it cannot distinguish between two sounds when it reaches the ear within 0.1 second is known as ________.

1. Echo

2. Reverberation

3. Attenuation

4. Persistence of hearing

Q.

How does a guitar produce sound? Discuss the role of the length of the string?

Q.

In the case of a drum, if we increase the tension of the stretched membrane, what will happen to the pitch of the sound produced?

1. Increase

2. Decrease

3. Remains same

4. Either increases or decreases

Q.

Sound is produced so long as sound source is _________.

Q.

Heavy curtains and carpets are good reflectors of sound.

1. True
2. False

Q.

When the sound travels in the air, the particles vibrate differently compared to the vibrations of the vibrating body.

1. True
2. False

Q.

Lesser is pitch of a screw ……………….. is its mechanical advantage.

Q.

Violins and guitars are both stringed instruments.

1. True
2. False

Q.

In which of the following medium is the velocity of sound equal to zero?

1. Steel

2. Vacuum

3. Air

4. Water

Q.

Sound can travel at its fastest speed in vacuum.

1. True

2. False

Q.

Sound continues to get produced for some time after the body stops vibrating.

1. False

2. True

Q.

A TV studio is an example of a ________ box.

Q. Identify the part which vibrates to produce sound in the following instruments.​

A. Dholak	P. Air column
B. Sitar	Q. Membrane
C. Flute	R. Strings

Q.

Give one example of when sound energy changes into electric energy.

Q.

List any three measures which you would take while designing a soundproof hall.

Q.

Write three characteristics of medium required for sound to propagate.