Sound Test

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Sound Test - 44

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Weekly Quiz Competition

Question 1
1 / -0

A metallic spoon falls on a metal plate making a huge sound and upon bouncing from the plate, it falls on to the pile of sand below it with no noise being heard. Sound is not heard on sand because

A
Sound is absorbed by sand particles

B
Sound generated by the plate is more than the sand particles

C
Vibration of metal plate is more than sand particles

D
Sand does not vibrate

Solution
Question 2
1 / -0

The sound having a frequency less than 20 Hz is called .......... .

A
Infrasonic

B
Ultrasonic

C
Energy

D
Vibrations

Solution

Sounds having frequency less than 20Hz are called infrasonic sound.Humans can hear sound only in range of 20Hz-20,000Hz.So humans can not hear infrasonic sound.
Question 3
1 / -0

Which characteristic of the sound helps you to identify your friend by his voice while sitting with others in a dark room?

A
The pitch of the sound.

B
The frequency of the sound.

C
The speed of the sound.

D
The wavelength of the sound.

Solution

Pitch denotes the shrillness or flatness of a sound. Pitch depends on frequency of sound.More frequency means more pitch and vice-versa.
Pitch is the characteristics of sound which help to identify the sound of different voices. Thus, because of difference in pitch of the sound wave coming from different people in the room, a person can identify the voice of his friend sitting with others in a dark room.
Question 4
1 / -0

Which of the following can caused by noise pollution?

A
Lack of sleep

B
Hypertension

C
Anxiety

D
All of the above

Solution

Unpleasant sounds are called noise. Excessive or unwanted sounds lead to noise pollution. Noise pollution may pose health problems for human beings.
Lack of sleep, hypertension (high blood pressure), anxiety, and many more health disorders may be caused by noise pollution. A person who is exposed to a loud sound continuously may get temporary or even permanent impairment of hearing.
Question 5
1 / -0

Some whistles are designed to produce waves that can attract the attention of dogs but humans do not notice these waves. What kind of waves are these?

A
These are normal sounds waves whose frequency is less than $20\ Hz$ . Humans cannot hear them because these waves have frequencies below the audible range.

B
These are normal sounds waves whose frequency is more than $20,000\ Hz$ . Humans cannot hear them because these waves have frequencies above the audible range.

C
These are electromagnetic waves.

D
These are supersonic sound waves.

Solution

A dog whistle (also known as a silent whistle or Galton's whistle) is a type of whistle that emits sound in the ultrasonic range, which most humans cannot hear but some other animals can, including dogs and domestic cats, and is used in their training.
Question 6
1 / -0

In sound wave:

A
Direction of vibration of particle is same as direction of energy

B
Direction of vibration of particle is perpendicular to the direction of energy

C
Vibration of particles does not exist

D
None of these

Solution

Sound is produced due to the vibration of different objects. Sound travels as a longitudinal wave through a material medium.In these waves the individual particles of the medium move in a direction parallel to the direction of propagation of the disturbance. The particles do not move from one place to another but they simply oscillate back and forth about their position of rest. This is exactly how a sound wave propagates.
Question 7
1 / -0

Statement 1: Loudness is the characteristic of a musical sound by which a loud sound can be distinguished from a faint sound.
Statement 2: Echo is always produced when sound is incident on the hard and polished surface.

A
Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.

B
Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.

C
Statement 1 is true but statement 2 is false

D
Statement 1 is false but statement 2 is true

Solution

Loudness is the measure of the Amplitude of sound which distinguishes two sounds having different Amplitudes

Echo, on the other hand, is a reflection phenomenon that takes place when sound Is reflected from a hard and polished surface. Loose surfaces absorb most of the sound incident on them hence no echo occurs.

Both of the statements are correct but statement 2 is not the correct explanation of statement 1.

So, B is the correct answer.
Question 8
1 / -0

A person has the audible range from $20 Hz$ to $20\times 10^3Hz$ . Find the wavelength range corresponding to these frequencies. Take velocity sound as $340m/s$

A
$15\times 10^{-3}m$

B
$11\times 10^{-3}m$

C
$17\times 10^{-3}m$

D
$15\times 10^{-8}m$

Solution
Question 9
1 / -0

Directions For Questions

Ultrasonic and Infrasonic Waves: The sound having frequency between $20$ Hz to $20$ kHz is called audible sound. Human ear cannot hear sound of frequencies lying outside this range. The limits of audibility of sound vary from individual. Generally the upper limit decreases with increase of age of individual; usually and people can not hear sound of frequency more than $15$ kHz.
Sound of frequencies below $20$ Hz are called infrasonics, while frequencies beyond $20$ kHz are called ultrasonics. Ultrasonics can be heard by dogs, cat, bats, etc. Bats detect the path by means of ultrasonics. Ultrasonics can be used for diagnosis of turnover and other abnormalities within our body. This is known as ultrasonography. Ultrasonics are used to cure various diseases and to measure depth of oceans to detect submarines.

...view full instructions

The waves produced by simple pendulum (having time period $2$ seconds) are.

A
Infrasonics

B
Audible

C
Ultrasonic

D
None of these

Solution

According to the above discussion,

Sound Frequency
Infrasonics f < 20 kHz
Ultrasonic f > 20 kHz
Time period of simple pendulum $T=2\ s$

Frequency of pendulum $f=\dfrac 1T=\dfrac 12=0.5\ Hz$

Because frequency sound produced by a simple pendulum is less than 20 Hz, we can say that sound waves will be Infrasonics.
Option A
Question 10
1 / -0

Th eardrum sends the vibrations to the _______?

A
Brain

B
Outer ear

C
Nerve Cell

D
Middle ear

Solution

The middle ear is right after the eardrum. So, the eardrum sends vibrations to the middle ear.
Hence the option $D$ is correct.

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Sound	Frequency
Infrasonics	f < 20 kHz
Ultrasonic	f > 20 kHz

Sound Test - 44

Result

Sound Test - 44

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Rank

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SHARING IS CARING

Question 1

Sound is absorbed by sand particles

Sound generated by the plate is more than the sand particles

Vibration of metal plate is more than sand particles

Sand does not vibrate

Solution

Question 2

Infrasonic

Ultrasonic

Energy

Vibrations

Solution

Question 3

The pitch of the sound.

The frequency of the sound.

The speed of the sound.

The wavelength of the sound.

Solution

Question 4

Lack of sleep

Hypertension

Anxiety

All of the above

Solution

Question 5

These are normal sounds waves whose frequency is less than 20 Hz20\ Hz20 Hz. Humans cannot hear them because these waves have frequencies below the audible range.

These are normal sounds waves whose frequency is more than 20,000 Hz20,000\ Hz20,000 Hz. Humans cannot hear them because these waves have frequencies above the audible range.

These are electromagnetic waves.

These are supersonic sound waves.

Solution

Question 6

Direction of vibration of particle is same as direction of energy

Direction of vibration of particle is perpendicular to the direction of energy

Vibration of particles does not exist

None of these

Solution

Question 7

Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.

Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.

Statement 1 is true but statement 2 is false

Statement 1 is false but statement 2 is true

Solution

Question 8

15×10−3m15\times 10^{-3}m15×10−3m

11×10−3m11\times 10^{-3}m11×10−3m

17×10−3m17\times 10^{-3}m17×10−3m

15×10−8m15\times 10^{-8}m15×10−8m

Solution

Question 9

Infrasonics

Audible

Ultrasonic

None of these

Solution

Question 10

Brain

Outer ear

Nerve Cell

Middle ear

Solution

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These are normal sounds waves whose frequency is less than $20\ Hz$ . Humans cannot hear them because these waves have frequencies below the audible range.

These are normal sounds waves whose frequency is more than $20,000\ Hz$ . Humans cannot hear them because these waves have frequencies above the audible range.

$15\times 10^{-3}m$

$11\times 10^{-3}m$

$17\times 10^{-3}m$

$15\times 10^{-8}m$