Sound Test

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Sound Test - 25

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Weekly Quiz Competition

Question 1
1 / -0

If a wave completes $$24$$ cycles in $$0.8 \ s$$, the time period of the above wave would be (in seconds)

A
0.03

B
30

C
0.3

D
none of these

Solution

The time period is simply the time taken to complete one cycle.
Time $$t$$ for $$24$$ cycles $$=0.8 \ s$$
Time $$T$$ for $$1$$ cycle $$=\dfrac{ total \ time \ taken }{number \ of \ cycles} = \dfrac{0.8}{24} $$
$$\therefore$$ Time period $$ T=\dfrac{8}{240}=\dfrac{1}{30}=0.0333 \ s \approx 0.03 \ s$$
Option A is the answer.
Question 2
1 / -0

Why is sound heard when a ball strikes the floor?

A
The air particles from the floor flow into our ears.

B
The air particles from the floor vibrate and pass the signal to our ears.

C
The air particles from the floor vibrate and produce transverse waves which flow through the air into our ears.

D
The wavelength of the sound wave is large enough to produce the sound.

Solution

B) The air particles from the floor vibrate and pass the signal to our ears

When a ball strikes on the floor, it vibrates the air molecules around it to give sound
Question 3
1 / -0

A body produces sound only if, it is

A
Made of steel

B
Made of glass

C
Plucked

D
Vibrating

Solution

Sound is caused by a vibration. Vibrational motion is back and forth, back and forth about a mean position. Now, if the object vibrates fast enough, it's going to disturb the air (or the medium). If the air (or the medium) vibrates, our ears will pick that up provided the frequency is in the audible range of hearing.
Question 4
1 / -0

A vibrating body :

A
Will always produce sound

B
May or may not produce sound if the amplitude of vibration is low

C
Will produce sound which is audible to humans.

D
None of the above

Solution

Any object that vibrates will create a sound. If the amplitudes of the vibrations are large enough and if natural frequency is within the human frequency range, then the vibrating object will produce sound waves that are audible to humans.
so the answer is A.
Question 5
1 / -0

Sound cannot travel through

A
Solids

B
Liquids

C
Vacuum

D
Gases.

Solution

Vacuum is defined as the empty space in which there are no matter particles present. As sound is a mechanical wave, in order to propagate material medium is required. Sound cannot travel through vacuum as there is no particles present for vibrations to take place.
So the answer is C.
Question 6
1 / -0

Which of the following statements is true?

A
Sound and light both require medium for propagation.

B
Sound can travel through vacuum, but light cannot.

C
Sound needs medium, but light doesn't need medium for its propagation.

D
Sound and light both can not travel in a medium.

Solution

Sound is a mechanical wave in which the medium particles oscillate about their mean position and helps in the propagation of the distubance/wave.
Light being an electromagnetic wave doesn't require any medium for its propagation. The oscillations in a light wave are of magnetic and electric fields which are not of particle nature.

So the answer is option C.
Question 7
1 / -0

________ is the characteristic of a musical sound by a which a loud sound can be distinguished from a faint sound even though both have the same pitch.

A
Loudness

B
Pitch

C
Quality

D
None of these

Solution

If two sounds have same frequency then they will have same pitch but they can be distinguished by loudness since the faint sound will have low amplitude and loud sound will have high amplitude.
So the answer is A.
Question 8
1 / -0

Vibrating bodies produce ........

A
Sound

B
Heat

C
Light

D
None of these

Solution

The sound is produced by the vibration of objects and is propagated through a medium from one location to another. The to and fro or back and forth motion of an object is termed as vibration.
Look at the above image, a boy is generating vibration in the stretched member of dholak and dholak is producing sound.
Question 9
1 / -0

A bomb explodes on the moon. How long will it take for the sound to reach the earth?

A
10 seconds

B
1000 seconds

C
1 day

D
None of these

Solution

Hint: Sound is a mechanical wave and need a medium to propagate.

Explanation:

Sound is a mechanical wave and hence it needs a medium to propagate and the outer space has vacuum and therefore if a bomb explodes on the moon its sound will never reach the Earth.

Thus, Option (D) is correct.
Question 10
1 / -0

Two waves of the same pitch have amplitude in the ratio 1 : 3. What will be the ratio of their frequencies ?

A
3 : 1

B
1 : 3

C
2 : 1

D
1 : 1

Solution

There are two main properties of a regular vibration - the amplitude and the frequency - which affect the way it sounds. Amplitude is the size of the vibration, and this determines how loud the sound is. Larger vibrations make a louder sound. Frequency is the speed of the vibration, and this determines the pitch of the sound. It is only useful or meaningful for musical sounds, where there is a strongly regular waveform.
Hence, if the pitch is the same for two waves then the frequency also remains the same. Therefore, the ratio of the frequencies is $$1:1$$.

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Re-Attempt Weekly Quiz Competition

Sound Test - 25

Result

Sound Test - 25

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Rank

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SHARING IS CARING

Question 1

0.03

30

0.3

none of these

Solution

Question 2

The air particles from the floor flow into our ears.

The air particles from the floor vibrate and pass the signal to our ears.

The air particles from the floor vibrate and produce transverse waves which flow through the air into our ears.

The wavelength of the sound wave is large enough to produce the sound.

Solution

Question 3

Made of steel

Made of glass

Plucked

Vibrating

Solution

Question 4

Will always produce sound

May or may not produce sound if the amplitude of vibration is low

Will produce sound which is audible to humans.

None of the above

Solution

Question 5

Solids

Liquids

Vacuum

Gases.

Solution

Question 6

Sound and light both require medium for propagation.

Sound can travel through vacuum, but light cannot.

Sound needs medium, but light doesn't need medium for its propagation.

Sound and light both can not travel in a medium.

Solution

Question 7

Loudness

Pitch

Quality

None of these

Solution

Question 8

Sound

Heat

Light

None of these

Solution

Question 9

10 seconds

1000 seconds

1 day

None of these

Solution

Question 10

3 : 1

1 : 3

2 : 1

1 : 1

Solution

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