Sound Test

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Sound Test - 55

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Weekly Quiz Competition

Question 1
1 / -0

If a vibrator strikes the water $$50$$ times in $$5s$$, then the frequency of wave is

A
$$10 Hz$$

B
$$0.5 Hz$$

C
$$5 Hz$$

D
$$0.1 Hz$$

Solution

Total number of vibrations, in $$5s$$ is $$50$$.
So, number of vibrations in $$1s$$ is $$\dfrac{50}{5}=10$$
Frequency$$=10Hz$$, (As frequency is defined as the number of oscillations or vibrations per second)
Question 2
1 / -0

Sound from the outside world reaches the inner ear through:

A
Pinna

B
Cochlea

C
Auditory canal

D
Labyrinth

Solution

Sound from the outside world is collected by the pinna and reaches the inner ear through the auditory canal.
Question 3
1 / -0

A source of wave produces $$1$$ crest and $$1$$ trough in $$16\ s.$$ Find the frequency of the wave.

A
$$0.0625\ Hz$$

B
$$16\ Hz$$

C
$$100\ Hz$$

D
$$10\ Hz$$

Solution

A source of wave produce $$1$$ crest and $$1$$ trough in $$16\ s$$.
$$\implies \text{Time period},\ T=16\ s$$
We know,
Frequency, $$f=\dfrac 1T$$

$$f=\dfrac {1}{16}$$

$$f=0.0625\ Hz$$
Question 4
1 / -0

A child inserted a needle in a man's ear. The man became deaf. Why?

A
The needle damaged the oval window

B
The needle damaged the stirrup

C
The needle damaged the ear drum

D
All of the above

Solution

The eardrum, also called the tympanic membrane, is a thin, cone-shaped membrane that separates the external ear from the middle ear. The vibrations produced in the eardrum allow you to hear the sound. Damage to the eardrum makes us deaf.
Question 5
1 / -0

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

A
Sound will persist for some time in the hall

B
The reflection may become an echo.

C
Multiple reflection may occur

D
All the above will happen

Solution

A sound created in a big hall will persist by repeated reflection from the walls until it is reduced to a value where it is no longer audible. Reverberation is the repeated reflection that results in this persistence of sound.

So option A and C are correct.

Now, it is a fact that the sensation of sound persists in our brain for about $$0.1 s$$. If the reverberation time is too long, the reflection will reach us after $$0.1 s.$$ We will hear a distinct echo if the minimum time interval between the original sound and the reflected sound is $$0.1 s$$

So option B is also correct.

Answer: D, all the above will happen.
Question 6
1 / -0

The tympanum of the ear receives the sound in the form of

A
compressions

B
rarefaction

C
reflection

D
both A and B

Solution

The tympanic membrane, also called the eardrum, a thin layer of tissue in the human ear that receives sound vibrations from the outer air and transmits them to the auditory ossicles, which are tiny bones in the tympanic (middle-ear) cavity. The tympanum of the ear receives the sound in the form of compressions and rarefactions. These compressions and rarefaction strike the eardrum that begins to vibrate.
Question 7
1 / -0

A device based on multiple reflection used for sending amplified sound in a particular direction is:

A
Bulb horn

B
Megaphone

C
Ear trumpet

D
All

Solution

Megaphone is based on multiple reflection of sound. It's purpose is to increase the loudness of sound and amplify it by multiple reflection of sound on inside surfaces.It is a horn shaped tube designed to send amplified sound in a particular direction. It is also called Loud hailer.
Question 8
1 / -0

When the sound waves reach the ________, it starts vibrating :

A
Pinna

B
Stir rup

C
Tympanic membrane

D
None of these

Solution

The tympanic membrane is also called the eardrum. When the sound waves strike the eardrum or tympanic membrane it starts vibrating. Sound from the outside world is collected by the pinna and reaches the eardrum through the auditory canal.
Question 9
1 / -0

It has been seen that the behavior of animals becomes unusual just before the tremor is felt. What is the reason behind this?

A
Because animals are able to detect infrasonic waves produced at the time of tremor.

B
Because animals are able to detect ultrasonic waves produced at the time of tremor.

C
Because animals are able to detect audible waves produced at the time of tremor.

D
All

Solution

Has been seen that the behavior of animals becomes unusual just before the tremor is felt. This is because animals are able to detect infrasonic waves produced at the time of tremor. Infrasonic waves are waves of frequency less than $$20\ Hz$$.
Question 10
1 / -0

Excessive reverberation in any auditorium/hall is not desirable because :

A
sound becomes blurred

B
sound become distorted

C
sound remains same

D
both A and B

Solution

Excessive reverberation in any auditorium or hall is not desirable because the sound becomes blurred and distorted. So the reverberation needs to be reduced.

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Re-Attempt Weekly Quiz Competition

Sound Test - 55

Result

Sound Test - 55

Score

-

Rank

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SHARING IS CARING

Question 1

$$10 Hz$$

$$0.5 Hz$$

$$5 Hz$$

$$0.1 Hz$$

Solution

Question 2

Pinna

Cochlea

Auditory canal

Labyrinth

Solution

Question 3

$$0.0625\ Hz$$

$$16\ Hz$$

$$100\ Hz$$

$$10\ Hz$$

Solution

Question 4

The needle damaged the oval window

The needle damaged the stirrup

The needle damaged the ear drum

All of the above

Solution

Question 5

Sound will persist for some time in the hall

The reflection may become an echo.

Multiple reflection may occur

All the above will happen

Solution

Question 6

compressions

rarefaction

reflection

both A and B

Solution

Question 7

Bulb horn

Megaphone

Ear trumpet

All

Solution

Question 8

Pinna

Stir rup

Tympanic membrane

None of these

Solution

Question 9

Because animals are able to detect infrasonic waves produced at the time of tremor.

Because animals are able to detect ultrasonic waves produced at the time of tremor.

Because animals are able to detect audible waves produced at the time of tremor.

All

Solution

Question 10

sound becomes blurred

sound become distorted

sound remains same

both A and B

Solution

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