Sound Test

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Sound Test - 1

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Question 1
1 / -0

In which of the following materials is the speed of sound maximum?

A
Air

B
Sea water

C
Fresh water

D
Steel

Solution

The speed of sound is maximum in steel among the given substances. The speed of sound depends upon the elastic behaviour of the medium. The greater the elasticity of the medium, the greater the speed of the sound.
Question 2
1 / -0

If two men talk on the Moon's surface, then

A
they hear each other with lower frequency

B
they hear each other with higher frequency

C
they can only hear each other

D
they can't hear each other at all

Solution

There is no atmosphere on Moon, so sound cannot travel in vacuum. Hence, they can't hear each other at all.
Question 3
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Read the following statements and choose the correct option accordingly.

Statement A: We can produce sound by changing the pressure of the air in the instrument.
Statement B: To produce sound, we have to do a certain mechanical work.

A
Both statements are correct.

B
Statement A is correct, but statement B is incorrect.

C
Statement A is incorrect, but statement B is correct.

D
Both statements are incorrect.

Solution

When we vibrate an object, a certain mechanical work has to be done. For example, we have to do a certain work for striking a tuning fork so that its prongs start vibrating.
When a vibrating object moves forward, it pushes and compresses the air in front of it creating a region of high pressure.

This region is called a compression. This compression starts to move away from the vibrating object. When the vibrating object moves backwards, it creates a region of low pressure called rarefaction. As the object moves back and forth rapidly, a series of compressions and rarefactions is created in the air.

These make the sound wave that propagates through the medium. Compression is the region of high pressure and rarefaction is the region of low pressure.
Question 4
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Note is a sound

A
of mixture of several frequencies

B
of mixture of two frequencies only

C
of a single frequency

D
always unpleasant to listen

Solution

A sound that is produced when several frequencies are mixed is called a note. For example, a musical note has tones of various frequencies (sounds of different pitches) and amplitudes (loudness). Usually, the loudest is called the fundamental. The higher frequency harmonics are called overtones which are the integer multiple of the fundamental frequency.
Question 5
1 / -0

Read the following statements and choose the correct option accordingly.

Statement A: During the propagation of a sound wave, particles oscillate to and fro about their mean positions.
Statement B: For the propagation of sound, the medium should be elastic in nature.

A
Both statements are correct.

B
Statement A is correct, but statement B is incorrect.

C
Statement A is incorrect, but statement B is correct.

D
Both statements are incorrect.

Solution

Mechanical waves can be produced only in media which possess elasticity and inertia. Sound is a mechanical wave, so it requires a medium which is elastic in nature.
When an object vibrates, it sets the particles of the medium around it vibrating.

The particles do not travel all the way from the vibrating object to the ear. A particle of the medium in contact with the vibrating object is first displaced from its equilibrium position. It then exerts a force on the adjacent particle.

As a result, the adjacent particle gets displaced from its position of rest. After displacing the adjacent particle, the first particle comes back to its original position. This process continues in the medium so the particle starts oscillating about their mean positions along the direction of the propagation of wave.
Question 6
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Two sounds A and B are of frequencies f and 2f, respectively. Which of the following is correct?

A
B is grave, A is shrill.

B
B is shrill, A is grave.

C
Both sounds are identical.

D
B is louder than A.

Solution

Sound B is shrill and A is grave because the frequency of B is more than that of A. The greater the frequency of the sound, the greater the shrillness in sound.
Question 7
1 / -0

Loudness of a sound is determined by the ________ of vibration.

A
frequency

B
amplitude

C
wavelength

D
velocity

Solution

Loudness of a sound is proportional to the square of the amplitude of the wave.
Question 8
1 / -0

Two sounds of same loudness and same pitch produced by two different instruments differ in their

A
frequencies

B
amplitudes

C
waveforms

D
All of the above

Solution

The waveform of a sound depends on the number of the overtones and their relative amplitudes along with the fundamental frequency. The resultant vibration obtained by the superposition of all these vibrations gives the waveform of sound.
Question 9
1 / -0

Read the following statements and choose the correct option accordingly.

Statement A: If the length of a string is increased, the pitch of the sound will also increase.
Statement B: The pitch of the sound is independent of the length of the string.

A
Both statements are correct.

B
Statement A is correct, but statement B is incorrect.

C
Statement A is incorrect, but statement B is correct.

D
Both statements are incorrect.

Solution

The pitch of the sound is proportional to the frequency of the sound. The greater the frequency, the higher the pitch.

The frequency of the sound is inversely proportional to the square root length. The greater the length, the lesser the frequency.

So, both the statements are wrong.

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Re-Attempt Weekly Quiz Competition

Sound Test - 1

Result

Sound Test - 1

Score

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Rank

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SHARING IS CARING

Question 1

Air

Sea water

Fresh water

Steel

Solution

Question 2

they hear each other with lower frequency

they hear each other with higher frequency

they can only hear each other

they can't hear each other at all

Solution

Question 3

Both statements are correct.

Statement A is correct, but statement B is incorrect.

Statement A is incorrect, but statement B is correct.

Both statements are incorrect.

Solution

Question 4

of mixture of several frequencies

of mixture of two frequencies only

of a single frequency

always unpleasant to listen

Solution

Question 5

Both statements are correct.

Statement A is correct, but statement B is incorrect.

Statement A is incorrect, but statement B is correct.

Both statements are incorrect.

Solution

Question 6

B is grave, A is shrill.

B is shrill, A is grave.

Both sounds are identical.

B is louder than A.

Solution

Question 7

frequency

amplitude

wavelength

velocity

Solution

Question 8

frequencies

amplitudes

waveforms

All of the above

Solution

Question 9

Both statements are correct.

Statement A is correct, but statement B is incorrect.

Statement A is incorrect, but statement B is correct.

Both statements are incorrect.

Solution

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