Sound Test

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Sound Test - 15

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Weekly Quiz Competition

Question 1
1 / -0

A tuning fork vibrates with 2 vibrations in 0.4 seconds. Its frequency (in Hz) is

A
5

B
6

C
8

D
0.8

Solution

Number of vibrations $$n = 2$$
Time taken $$t = 0.4$$ s
Thus frequency of sound $$\nu = \dfrac{n}{t}$$
$$\therefore$$ $$\nu = \dfrac{2}{0.4} = 5 \ Hz$$
Question 2
1 / -0

A sound wave completes $$24$$ cycles in $$0.8\;s$$. The time period of the wave would be:

A
$$1/30\;s$$

B
$$30\;s$$

C
$$1/24\;s$$

D
$$24\;s$$

Solution

A time period is the time taken to complete one cycle.

Given that, the sound wave completes $$24$$ cycles in $$0.8\,s$$

So, the time taken to complete one cycle $$=\dfrac{0.8}{24}=\dfrac{1}{30}\,s$$

Hence the time period is $$\dfrac{1}{30}\,s$$
Question 3
1 / -0

Select the loudness level that is above the normal hearing range

A
150 decibels

B
40 decibels

C
70 decibels

D
90 decibels

Solution

In order for us to be able to hear a sound at all, it has to be above a certain level. This level is called the auditory threshold or hearing threshold. Humans have a hearing threshold of around $$0$$ decibels. Above this threshold, sounds with higher sound pressure levels are heard as louder noises. Sounds above $$90\, dB$$ can lead to chronic hearing damage if people are exposed to them every day or all the time. Hearing becomes uncomfortable if the sound pressure level is above $$110$$ decibels (threshold of discomfort), and it becomes painful above $$130$$ decibels (threshold of pain).
Question 4
1 / -0

Select the odd one out (soft horns, ear plugs, silencers, loudspeakers)

A
soft horns

B
ear plugs

C
silencers

D
loudspeakers

Solution

Except loud speaker all are preventive measures of noise pollution while loud speaker creates noise pollution
Question 5
1 / -0

Select the odd one out (loudspeakers, aeroplanes, vacuum cleaners, ear plugs)

A
Ear plugs

B
Aeroplanes

C
Vacuum cleaners

D
Loudspeakers

Solution

Loudspeakers, aeroplanes and vacuum cleaners are sources of sound, while ear plug is not.
Hence, option A is correct.
Question 6
1 / -0

Sounds having frequency more than 20,000 Hz are called -

A
sonic sound

B
ultrasonic sound

C
infrasonic sound

D
none of these

Solution

Sounds having frequency more than 20,000 Hz are called Ultrasonic sound. As this is above the normal hearing range for humans, we cannot hear ultrasonic sound.
Question 7
1 / -0

We, humans, produce sound by using :

A
Oesophagus

B
Larynx

C
Thyroid Gland

D
Mouth

Solution

Larynx is known as the voice box. It is located at the upper end of the windpipe. The vocal cords stretch the larynx in such a way that a passage is created between them. When air passes through this passage the vocal cords vibrate and produce sound.
Question 8
1 / -0

What is the name of the strings which vibrate in our voice box when we talk?

A
Oesophagus

B
Pharyngeal slits

C
Vocal cords

D
All

Solution

The name of the strings which vibrate in our voice box when we talk is vocal cords. These are two bands of elastic tissue located side by side in the voice box (larynx) just above the trachea.
Question 9
1 / -0

If a vibrator strikes the water 50 times in 5 second, then the frequency of wave is________.

A
10 Hz

B
0.5 Hz

C
5 Hz

D
0.1 Hz

Solution

In $$5 seconds$$ it vibrates $$50 times$$
In one sec it will vibrate $$ \dfrac{50}{5} = 10 times$$
And the number of vibrations in one second is nothing but frequency defined as number of oscillations in one second .
$$freq = \dfrac{10 times}{1s} = 10 Hz.$$
Where $$1Hz$$ = one oscillation per second.
Question 10
1 / -0

Muscles attached to the vocal cords can make them

A
Tight only

B
Loose only

C
Both loose and tight as per requirement

D
Neither loose nor tight

Solution

The muscles attached to the vocal cords can expand and contract, thus making them tight and loose. The voice quality changes depending on whether the vocal cords are tight or loose.

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Re-Attempt Weekly Quiz Competition

Sound Test - 15

Result

Sound Test - 15

Score

-

Rank

-

SHARING IS CARING

Question 1

5

6

8

0.8

Solution

Question 2

$$1/30\;s$$

$$30\;s$$

$$1/24\;s$$

$$24\;s$$

Solution

Question 3

150 decibels

40 decibels

70 decibels

90 decibels

Solution

Question 4

soft horns

ear plugs

silencers

loudspeakers

Solution

Question 5

Ear plugs

Aeroplanes

Vacuum cleaners

Loudspeakers

Solution

Question 6

sonic sound

ultrasonic sound

infrasonic sound

none of these

Solution

Question 7

Oesophagus

Larynx

Thyroid Gland

Mouth

Solution

Question 8

Oesophagus

Pharyngeal slits

Vocal cords

All

Solution

Question 9

10 Hz

0.5 Hz

5 Hz

0.1 Hz

Solution

Question 10

Tight only

Loose only

Both loose and tight as per requirement

Neither loose nor tight

Solution

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