Sound Test

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Sound Test - 26

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Weekly Quiz Competition

Question 1
1 / -0

The amplitude of vibration and frequency can abruptly change in a what kind of sound?

A
Pitch

B
Musical sound

C
Noise

D
All of the above

Solution

Pitch is a characteristic of sound that depends upon the frequency and the amplitude of vibration doesn't affect it.
A musical sound has regular and discrete frequencies, sudden change in amplitude and frequency will make it unpleasant, so it doesn't happen in musical sound.
Noise is a mixture of irregular and continuous frequencies which has a sudden change in amplitude and frequency.
Question 2
1 / -0

The lowest pitch out of the following sources is that of a

A
Man

B
Boy

C
Lion

D
Mosquito

Solution

The pitch depends on how often a particle vibrates when a wave passes through, which is also known as the frequency of the wave. How often does the pressure vary from high to low and back again? The higher the frequency (more vibrations), then the higher the pitch will be; the lower the frequency (less vibrations), the lower the pitch will be.

The higher pitched sound is more shrill in nature, while the lower pitched sound has a higher base.

Hence, option "C" is correct.
Question 3
1 / -0

What is the safe limit of sound level (in $$dB$$) for our ears?

A
$$12\ dB$$

B
$$120\ dB$$

C
$$180\ dB$$

D
$$10\ dB$$

Solution

Sound pressure is measured in decibels (dB). Noise levels above 140 dB are not considered safe for any period of time. However, for children, the World Health Organization (WHO) recommends no exposure above $$120\ dB$$.
Question 4
1 / -0

The time period of a simple pendulum is $$2 \ s$$. Find its frequency?

A
$$0.5 \ Hz$$

B
$$1 \ Hz$$

C
$$1.5 \ Hz$$

D
$$2 \ Hz$$

Solution

The Time period of a simple pendulum is given as 2 seconds.
The frequency is given as the inverse of time period, that is, $$f=\dfrac { 1 }{ T } $$
$$f =\dfrac { 1 }{ 2 } \quad =\quad 0.5\quad Hz$$
Question 5
1 / -0

Choose the correct option.
Sound cannot travel in:

A
Iron

B
Water

C
Air

D
Vacuum

Solution

Sound is produced when something vibrates. The vibrating body causes the medium (water, air, etc.) around it to vibrate.
The mechanical vibrations that can be interpreted as sound are able to travel through all forms of matter: gases, liquids, solids, and plasmas. The matter that supports the sound is called the medium.
Sound cannot travel through a vacuum. Sounds cannot be heard in a vacuum, as waves need a medium to carry them.
Question 6
1 / -0

Bats detect the obstacles in their path by receiving the reflected

A
infrasonic waves

B
ultrasonic waves

C
micro waves

D
radio waves

Solution

The answer is B.

Bats emit a series of high-frequency sounds from their mouths or nostrils that bounce off objects and then return to the ears of bats. These high-frequency sounds are called ultrasonic waves. with the help of the reflection of ultrasonic waves, bats detect the obstacles in their path.
Question 7
1 / -0

A progressive sound wave of frequency 500Hz is travelling through air with a speed of $$ 350 ms^{-1} $$. A compression maximum appears at a place at a given instant. The minimum time interval after which the rarefraction maximum occurs at the same point , is

A
$$ 200 s $$

B
$$\dfrac{1}{250} s$$

C
$$\dfrac{1}{500} s $$

D
$$\dfrac{1}{1000} s$$

Solution

Time period of wave $$T =\dfrac{1}{500}$$

In one time period there is a maximum of both rarefaction and compression,

hence time after which rarefaction occurs is $$\dfrac{T}{2} = \dfrac{1}{1000}$$
Question 8
1 / -0

The heart of a man beats $$75$$ times a minute. What is its time period?

A
$$0.75s$$

B
$$1.33s$$

C
$$1.25s$$

D
$$0.8s$$

Solution

To calculate the frequency in hertz, we have to measure the time in seconds.
That is, t= 1 minute = 60 seconds.
Number of time it beats = 75 times per minute.
Frequency is given as,
Number of times it beats/Total time taken in seconds = 75/60 = 1.25 Hz.
Hence, the frequency of a man's heartbeat is 1.25 times per second.
The time period is given as the inverse of frequency, that is, $$T=\dfrac { 1 }{ f } =\dfrac { 1 }{ 1.25 } = 0.8\; seconds$$.
Hence, the time period of a man's heart beat is 0.8 seconds.
Question 9
1 / -0

Complete the following sentence.

Sound can not travel through ..............................., but it requires a ................... .

A
$$air, medium$$

B
$$water, medium$$

C
$$solids, medium$$

D
$$vacuum, medium$$

Solution

Sound waves need to travel through a medium such as a solid, liquid, or gas. The sound waves move through each of these mediums by vibrating the molecules in the matter. The molecules in solids are packed very tightly. Liquids are not packed as tightly as solids. And gases are very loosely packed. The spacing of the molecules enables sound to travel much faster through a solid than a gas. Sound travels about four times faster and farther in water than it does in air.
Sound waves are travelling vibrations of particles in media such as air, water or metal. So it stands to reason that they cannot travel through empty space, where there are no atoms or molecules to vibrate.
Hence, Sound cannot travel through vacuum, but it requires a medium.
Question 10
1 / -0

The heart of a man beats $$75$$ times a minute. What is its frequency?

A
$$1.25 \ s^{-1}$$

B
$$2.5 \ s^{-1}$$

C
$$7.5 \ s^{-1}$$

D
$$75 \ s^{-1}$$

Solution

To calculate the frequency in hertz, we have to measure the time in seconds.
That is, t= 1 minute = 60 seconds.
Number of time it beats = 75 times per minute.
Frequency is given as,

Number of times it beats/Total time taken in seconds = 75/60 = 1.25 Hz.

Hence, the frequency of a man's heartbeat is 1.25 times per second.

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Re-Attempt Weekly Quiz Competition

Sound Test - 26

Result

Sound Test - 26

Score

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Rank

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SHARING IS CARING

Question 1

Pitch

Musical sound

Noise

All of the above

Solution

Question 2

Man

Boy

Lion

Mosquito

Solution

Question 3

$$12\ dB$$

$$120\ dB$$

$$180\ dB$$

$$10\ dB$$

Solution

Question 4

$$0.5 \ Hz$$

$$1 \ Hz$$

$$1.5 \ Hz$$

$$2 \ Hz$$

Solution

Question 5

Iron

Water

Air

Vacuum

Solution

Question 6

infrasonic waves

ultrasonic waves

micro waves

radio waves

Solution

Question 7

$$ 200 s $$

$$\dfrac{1}{250} s$$

$$\dfrac{1}{500} s $$

$$\dfrac{1}{1000} s$$

Solution

Question 8

$$0.75s$$

$$1.33s$$

$$1.25s$$

$$0.8s$$

Solution

Question 9

$$air, medium$$

$$water, medium$$

$$solids, medium$$

$$vacuum, medium$$

Solution

Question 10

$$1.25 \ s^{-1}$$

$$2.5 \ s^{-1}$$

$$7.5 \ s^{-1}$$

$$75 \ s^{-1}$$

Solution

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