Sound Test

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Sound Test - 10

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Weekly Quiz Competition

Question 1
1 / -0

The maximum displacement of a sound wave on either side of the mean position of its vibration is the measure of its

A
amplitude

B
frequency

C
period

D
speed

Solution

The amplitude of a sound wave is given by the maximum displacement of its vibration from the mean position.

The correct answer is A.
Question 2
1 / -0

With reference to sound, the number of to and fro motions of a membrane in per unit time is expressed in the unit of

A
angstrom

B
second

C
meter

D
hertz

Solution

Hertz (Hz) is the unit of frequency. Frequency is defined as the number of oscillations or vibrations per unit time. Hence, the number of to and fro motions of a membrane per unit time is measured in hertz.

The correct answer is D.
Question 3
1 / -0

The loudness of a sound is determined by

A
the amplitude of the vibrations of the sound

B
how fast the source is moving to and fro

C
the size of the source of the sound

D
how it is reflected from a surface

Solution

Sound is produced because of the vibrations of a body, called sound source. The amplitude of the sound is determined by the amplitude of the vibrations. The larger the amplitude of the vibrations, the louder is the sound. Hence, the loudness of a sound is governed by the amplitude of the vibrations.

The correct answer is A.
Question 4
1 / -0

Nowadays, government and local bodies are taking initiatives in roadside plantation. This helps in

A
reducing noise pollution

B
reducing traffic congestion

C
increasing the durability of roads

D
increasing the visibility of drivers

Solution

Trees and plants, planted along the roadside and in and around residential colonies, cut down the traffic noise reaching the residents. This helps in reducing noise pollution.

The correct answer is A.

Question 5

1 / -0

Use the following information to answer the next question.

Humans cannot hear all the sounds produced in their surroundings. The sounds whose frequencies fall in the audible range can only be heard by humans. The lower limit of the audible range for human ears is 20 Hz and the upper limit is a × 10^b Hz.

What are the respective values of a and b?

1 and 2

2 and 4

3 and 2

1 and 3

Solution

The audible range for human ears is 20 Hz − 20000 Hz. Therefore, the upper limit of the human audible range is 20000 Hz or 2 × 10⁴ Hz. Hence, the respective values of a and b are 2 and 4.

The correct answer is B.

Question 6
1 / -0

What should a hearing-impaired person wear in order to enhance his hearing power by amplifying sound?

A
Ear-horn

B
Stethoscope

C
Mobile headset

D
Jackhammer’s headphone

Solution

An ear-horn is used to enhance the hearing ability of a person with weak hearing power. This device amplifies the incoming sound in order to increase its loudness, thereby enabling the person to hear the sound.

The correct answer is A.
Question 7
1 / -0

With reference to the human ear, exposure to excessive sound may damage its

A
pinna

B
eardrum

C
ear canal

D
Eustachian tube

Solution

The eardrum is a thin membrane present in the ear which vibrates in response to a sound. The amount of vibration of the eardrum depends on the loudness of the sound. If the loudness of a sound increases, then the amplitude of the vibration of the eardrum also increases. Excessive sound forces the eardrum to vibrate with large amplitude. As a result, it may get damaged.

The correct answer is B.
Question 8
1 / -0

Vibration can be defined as the

A
stretching of a membrane

B
roughness of a membrane

C
circular motion of a membrane

D
to and fro motion of a membrane

Solution

The to and fro or back and forth motion of a membrane is called its vibration.

The correct answer is D.
Question 9
1 / -0

Use the following information to answer the next question.

One of the prongs of a tuning fork is struck against a rigid wall. A to and fro motion of the prongs is observed. Then, the vibrating fork is touched to a still water surface.

Which of the following phenomena is observed in the water?

A
Water starts boiling

B
Water starts freezing

C
Water surface starts rotating

D
Water surface starts vibrating

Solution

When a vibrating body is touched to another body, the vibrations of the first body get transmitted to the second body. Therefore, when the vibrating tuning fork is touched to the water surface, the vibrations of the fork get transmitted to the water, causing the water surface to start vibrating.

The correct answer is D.
Question 10
1 / -0

The plucking of a stretched metal wire produces sound because

A
of change in atmospheric pressure around the wire

B
it is made up of a good conductor of electricity

C
of generation of heat

D
it starts vibrating

Solution

Vibrating objects produce sound. When a stretched metal wire is plucked, it starts vibrating. This, in turn, produces a sound.

The correct answer is D.
Question 11
1 / -0

Which part of the human body vibrates to produce sounds?

A
Windpipe

B
Eardrum

C
Vocal cord

D
Nasal cavity

Solution

When the human lungs force air out through the vocal cord, it starts vibrating. Hence, a sound is produced.

The correct answer is C.
Question 12
1 / -0

The sound coming from an alarm clock cannot be heard if it is kept inside a box that is

A
filled with liquid only

B
filled with both solid and liquid

C
made up of iron with air inside it

D
devoid of any material medium inside

Solution

Sound travels through material media only. Solids, liquids, and gases are all material media. Therefore, sound cannot pass through a box devoid of any material medium inside. Hence, the sound produced by an alarm clock cannot be heard if it is kept in a box that is devoid of any material medium inside.

The correct answer is D.
Question 13
1 / -0

Which of the following actions is not related to the production of sound by humans?

A
The forcing out of air by the lungs through the windpipe

B
The expansion of the lungs in order to fill air

C
The loosening of the vocal cord

D
The vibration of the vocal cord

Solution

Only vibrations can produce sound. No parts vibrate when the lungs expand to fill air inside itself. Hence, the expansion of lungs is not related to the production of sound.

The correct answer is B.

Question 14

1 / -0

Use the following information to answer the next question.

The given table lists the main parts of the human ear that take part in hearing.

Parts of the human ear

I. Ear canal

II. Three tiny bones

III. Eardrum

IV. Cochlea

The order in which sound vibration moves through the human ear is

I → II → III → IV

I → III → II → IV

III → I → IV → II

III → IV → I → II

Solution

The vibration coming from a sound-producing object passes through the ear canal (I) to the eardrum (III). In response to the vibration, the eardrum starts vibrating. The eardrum transfers its vibration to the three tiny bones (II). These bones vibrate in accordance with the vibration of the eardrum. These vibrations are received by a coil-shaped tube known as the cochlea (IV). The cochlea contains sound-sensitive nerve cells that pass the sense of vibration to the brain.

The correct answer is B.

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Re-Attempt Weekly Quiz Competition

Sound Test - 10

Result

Sound Test - 10

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SHARING IS CARING

Question 1

amplitude

frequency

period

speed

Solution

Question 2

angstrom

second

meter

hertz

Solution

Question 3

the amplitude of the vibrations of the sound

how fast the source is moving to and fro

the size of the source of the sound

how it is reflected from a surface

Solution

Question 4

reducing noise pollution

reducing traffic congestion

increasing the durability of roads

increasing the visibility of drivers

Solution

Question 5

1 and 2

2 and 4

3 and 2

1 and 3

Solution

Question 6

Ear-horn

Stethoscope

Mobile headset

Jackhammer’s headphone

Solution

Question 7

pinna

eardrum

ear canal

Eustachian tube

Solution

Question 8

stretching of a membrane

roughness of a membrane

circular motion of a membrane

to and fro motion of a membrane

Solution

Question 9

Water starts boiling

Water starts freezing

Water surface starts rotating

Water surface starts vibrating

Solution

Question 10

of change in atmospheric pressure around the wire

it is made up of a good conductor of electricity

of generation of heat

it starts vibrating

Solution

Question 11

Windpipe

Eardrum

Vocal cord

Nasal cavity

Solution

Question 12

filled with liquid only

filled with both solid and liquid

made up of iron with air inside it

devoid of any material medium inside

Solution