Sound Test

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Sound Test - 15

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Weekly Quiz Competition

Question 1

1 / -0

Use the following information to answer the next question.

Tarun fills a beaker with water and puts a small piece of cork in it. He then strikes a tuning fork with a rubber hammer and gently touches its vibrating prongs on the water surface.

As consequence of Tarun’s action, the cork will

sink in the water

travel toward the prongs

travel away from the prongs

start moving up and down in its position

Solution

When a vibrating object is touched with another object, then the second object also starts vibrating. This is because the vibration of the first object is transferred to the second object. In the given case, when the vibrating tuning fork is gently placed on the surface of water, the latter will also start vibrating. As a result, crests and troughs will be created in the water, thereby causing the cork to start vibrating up and down in its position.

The correct answer is D.

Question 2

1 / -0

Use the following information to answer the next question.

Four small glass boxes I, II, III, and IV are placed in front of Yashika. Boxes I, II, and III are filled with oil, water, and sand respectively. Box IV is devoid of any medium. A waterproof sound-producing device is given to her and she is asked to put that device in that box from which no sound can be heard.

In which box should Yashika place the sound-producing device?

I

II

III

IV

Solution

Sound requires a medium to travel. It cannot travel in a region that is devoid of any medium, i.e., vacuum. Hence, if Yashika places the sound-producing device in box IV, then no sound will be heard from it.

The correct answer is D.

Question 3
1 / -0

Which of the following physical quantities remains unchanged when a sound wave enters from one medium to another?

A
Amplitude

B
Loudness

C
Frequency

D
Wavelength

Solution

The frequency of a sound wave does not depend on the medium through which it is propagating. For a particular sound wave, it remains invariant in all media. Hence, the frequency of a given sound wave remains unchanged when the sound wave enters from one medium to another.

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

A loud sound is characterised by

A
large amplitude

B
low frequency

C
high quality

D
low pitch

Solution

The loudness of a sound depends on the amplitude of the sound wave. The more the amplitude of a sound wave, the louder is the sound and vice versa.

The correct answer is A.

Question 5

1 / -0

Use the following information to answer the next question.

Three statements regarding the speed of sound:

I In air, the speed of sound is slower than that of light.

II The speed of sound is the minimum in a gaseous medium.

III The speed of sound in a medium decreases with an increase in the temperature of the medium.

With respect to the speed of sound,

only II is correct

only III is correct

both I and II are correct

both I and III are correct

Solution

The speed of sound in air is 344 m/s, whereas the speed of light in air is
3 × 10⁸ m/s. Hence, statement I is correct.

The speed of sound is the minimum in a gaseous medium and the maximum in a solid medium. Hence, statement II is correct.

The correct answer is C.

Question 6
1 / -0

In a cinema hall or in an auditorium, the roof and the inside walls are covered with compressed fibre boards and draperies. Heavy curtains are placed on the doors and seats are made up of cushioned materials. The given arrangements are done to

A
magnify echo

B
magnify sound

C
reduce pitch

D
reduce reverberations

Solution

When a sound is produced in a hall or in an auditorium, it persists there for a while. This persistence of sound is caused by the repeated reflections of sound from the walls and the roof. These repeated reflections of sound are termed as reverberations. If the reverberations persist for long, then the sound becomes distorted, noisy, and unclear. Therefore, to reduce the excessive reverberations, sound-absorbing materials (such as fibre boards, draperies, heavy curtains) are used.

Hence, the correct answer is option D.
Question 7
1 / -0

Use the following information to answer the next question.

Ultrasounds are high frequency waves. They can travel along a well-defined path even in the presence of an obstacle.

The property of an ultrasound cannot be used in

A
detecting cracks in metal blocks

B
breaking stones formed in the kidneys

C
measuring the pressure on a submarine

D
making images of the internal organs of the body

Solution

Ultrasounds cannot be used to measure underwater pressure. In a submarine, ultrasounds (produced by devices such as SONAR) are used to measure the sea depth or the presence of torpedoes or other submarines.

The correct answer is C.

Question 8

1 / -0

Use the following information to answer the next question.

The frequency of sound produced by different animals can be categorised as infrasonic, audible, and ultrasonic, depending on the frequency range of the produced sounds.

Which table shows the frequency ranges of each of the given terms?

Term Frequency range (Hz)

Infrasonic 0 − 20

Audible 20 − 20000

Ultrasonic Above 20000

Term Frequency range (Hz)

Infrasonic 0 − 20

Audible Above 20000

Ultrasonic 20 − 20000

Term Frequency range (Hz)

Infrasonic 20 − 20000

Audible 0 − 20

Ultrasonic Above 20000

Term Frequency range (Hz)

Infrasonic Above 20000

Audible 20 − 20000

Ultrasonic 0 − 20

Solution

The sound of frequency less than 20 Hz is known as infrasonic sound. The sound of frequency greater than 20000 Hz is known as ultrasonic sound. The sound of frequency lie between 20 Hz to 20000 Hz is known as audible sound.

The correct answer is A.

Question 9
1 / -0

With reference to the human ear, the functioning of the cochlea is to

A
maintain the air pressure in the ear

B
collect sound from the surroundings

C
convert sound into electrical signals

D
vibrate in response to the sound that hits it

Solution

The cochlea is a part of the inner ear. It is snail-shaped. When the sound coming from the middle ear passes, the liquid present in the cochlea converts this vibration into electrical signals.

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

An audible sound is produced when a

A
tuning fork is placed on a table

B
leaf falls on the ground

C
pendulum oscillates

D
string is plucked

Solution

Sound waves are created by the vibration of an object. However, every vibration does not produce an audible sound. Only vibrations having a frequency between 20 Hz and 20000 Hz produce audible sound. When a string is plucked, it produces a vibration that is within the audible range.

The correct answer is D.

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Re-Attempt Weekly Quiz Competition

Term	Frequency range (Hz)
Infrasonic	0 − 20
Audible	20 − 20000
Ultrasonic	Above 20000

Term	Frequency range (Hz)
Infrasonic	0 − 20
Audible	Above 20000
Ultrasonic	20 − 20000

Term	Frequency range (Hz)
Infrasonic	20 − 20000
Audible	0 − 20
Ultrasonic	Above 20000

Term	Frequency range (Hz)
Infrasonic	Above 20000
Audible	20 − 20000
Ultrasonic	0 − 20

Sound Test - 15

Result

Sound Test - 15

Score

-

Rank

-

SHARING IS CARING

Question 1

sink in the water

travel toward the prongs

travel away from the prongs

start moving up and down in its position

Solution

Question 2

I

II

III

IV

Solution

Question 3

Amplitude

Loudness

Frequency

Wavelength

Solution

Question 4

large amplitude

low frequency

high quality

low pitch

Solution

Question 5

only II is correct

only III is correct

both I and II are correct

both I and III are correct

Solution

Question 6

magnify echo

magnify sound

reduce pitch

reduce reverberations

Solution

Question 7

detecting cracks in metal blocks

breaking stones formed in the kidneys

measuring the pressure on a submarine

making images of the internal organs of the body

Solution

Question 8

Term Frequency range (Hz) Infrasonic 0 − 20 Audible 20 − 20000 Ultrasonic Above 20000

Term Frequency range (Hz) Infrasonic 0 − 20 Audible Above 20000 Ultrasonic 20 − 20000

Term Frequency range (Hz) Infrasonic 20 − 20000 Audible 0 − 20 Ultrasonic Above 20000

Term Frequency range (Hz) Infrasonic Above 20000 Audible 20 − 20000 Ultrasonic 0 − 20

Solution

Question 9

maintain the air pressure in the ear

collect sound from the surroundings

convert sound into electrical signals

vibrate in response to the sound that hits it

Solution

Question 10

tuning fork is placed on a table

leaf falls on the ground

pendulum oscillates

string is plucked

Solution

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Term Frequency range (Hz)

Infrasonic 0 − 20

Audible 20 − 20000

Ultrasonic Above 20000

Term Frequency range (Hz)

Infrasonic 0 − 20

Audible Above 20000

Ultrasonic 20 − 20000

Term Frequency range (Hz)

Infrasonic 20 − 20000

Audible 0 − 20

Ultrasonic Above 20000

Term Frequency range (Hz)

Infrasonic Above 20000

Audible 20 − 20000

Ultrasonic 0 − 20