Sound Test

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Sound Test - 39

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Weekly Quiz Competition

Question 1
1 / -0

What does noise comprises of?

A
Low Frequency, Irregular waveform and sudden changes in amplitude or wavelength

B
High Frequency, Irregular waveform and sudden changes in amplitude or wavelength

C
Low Frequency, regular waveform and sudden changes in amplitude or wavelength

D
Low Frequency, Irregular waveform and No sudden changes in amplitude or wavelength
Question 2
1 / -0

One sound wave strikes a person's ear every 1/100 of second. The speed of the sound where the person is located is 345 m/s. What is the frequency of the sound?

A
3.45 Hz

B
34.500 Hz

C
0.01 Hz

D
100 Hz

E
2.9 Hz

Solution

Time period of wave of striking the person's ear $$T = \dfrac{1}{100} = 0.01$$ second
Thus frequency of the sound wave $$\nu = \dfrac{1}{T} = \dfrac{1}{0.01} = 100$$ Hz
Question 3
1 / -0

One sound wave strikes a person's ear every $$1/100$$ of a second. The speed of sound where the person is located is $$345 m/s$$.
What is the frequency of the sound?

A
$$3.45\ Hz$$

B
$$34,500\ Hz$$

C
$$0.01\ Hz$$

D
$$100\ Hz$$

E
$$2.9\ Hz$$

Solution

Time period of sound wave $$T = \dfrac{1}{100}$$ second

$$\therefore$$ Frequency of sound wave $$\nu = \dfrac{1}{T} =100$$ $$Hz$$
Question 4
1 / -0

A tuning fork of frequency 420 Hz completes 70 vibrations. Find the distance travelled by sound in air (v = 360 m $$s^{-1})$$

A
20 m

B
50 m

C
60 m

D
80 m

Solution

Number of vibration in $$1sec=420$$
Time taken for $$70$$ vibrations $$=\cfrac{70}{420}=0.167s$$
Distance=speed$$\times$$ Time
As, speed of sound = $$360\ m/s$$
$$\Rightarrow 360\times 0.167=60m$$
Sound travels $$60m$$ when the turning fork makes $$70$$ vibration.
Question 5
1 / -0

Match the following and choose the correct answer.
A String vibration 1 Tabla
B Membrane vibration 2 Bicycle bell
C Vibration of air 3 Sitar
D Vibration of plate 4 Flute

A
A-1, B-2, C-3, D-4

B
A-2, B-1, C-4, D-3

C
A-3, B-1, C-4, D-2

D
A-4, B-3, C-2, D-1

Solution

String vibration is there in sitar.
Membrane vibration is there in tabla.
Vibration of air is in flute.
Vibration of plate is in bicycle bell.
Question 6
1 / -0

A shrill sound has a_______pitch and a dull sound has a___________pitch.

A
High, low

B
Low, high

C
Low, low

D
High, high

Solution

Pitch is the rise and fall of our voice when we speak. It is the characteristic of sound by which we can distinguish the sounds of the same loudness. Types: Pitch is generally of two types, high pitch and low pitch. The higher the frequency of the sound, the higher will be the pitch.The lower the frequency of sound lower will be the pitch.
A high pitch sound is called shrill sound while a low pitch sound is called dull sound.
Question 7
1 / -0

Loudness of sound increases with:

A
The amplitude of vibrating body

B
The increase in surface area of vibrating body

C
The decrease in frequency of vibrating body

D
The increase in distance from the source of sound

Solution

Loudness of a sound $$L = 10\log_{10} \dfrac{I}{I_o}$$
where intensity $$I$$ is proportional to the square of the amplitude $$A$$ of vibrating body i.e. $$I \propto A^2$$
Hence loudness of sound depends directly on the amplitude of vibrating body.
Thus, loudness of sound increases with increase in amplitude of vibrating body.
Question 8
1 / -0

Longitudinal waves cannot travel through

A
Vacuum

B
Solids

C
Liquids

D
Gases

Solution

Longitudinal waves are like mechanical waves which need the medium to propagate. These waves cannot travel through a vacuum. A vacuum is an area where there are no liquids, gases or solids of any kind. That is, there is absolutely in a vacuum. If there are no substances, then there are no particles for the sound waves to vibrate, which means the sound waves cannot travel.
Question 9
1 / -0

The grandparents and parents of a two-year-old girl are playing with her in a room. A sound source produces a $$28\ kHz$$ sound. Who in the room is most likely to hear the sound?

A
Grandparent

B
Little girl

C
Both

D
None of them

Solution

The frequency range of hearing in infants is more than in adults. As the infant gets mature, this range decreases. So two-year girl will be more likely to hear that sound.
Question 10
1 / -0

Which of the following is the vibrating part of a Saxophone?

A
Stretched -Membrane

B
Stretch-String

C
Air column

D
None of the above

Solution

Wind instruments are those which are played by blowing air into them through the human mouth. They include saxophone, trumpet, flute, etc. In any wind instrument, it is the air column that vibrates and produces music.

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A	String vibration	1	Tabla
B	Membrane vibration	2	Bicycle bell
C	Vibration of air	3	Sitar
D	Vibration of plate	4	Flute

Sound Test - 39

Result

Sound Test - 39

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SHARING IS CARING

Question 1

Low Frequency, Irregular waveform and sudden changes in amplitude or wavelength

High Frequency, Irregular waveform and sudden changes in amplitude or wavelength

Low Frequency, regular waveform and sudden changes in amplitude or wavelength

Low Frequency, Irregular waveform and No sudden changes in amplitude or wavelength

Question 2

3.45 Hz

34.500 Hz

0.01 Hz

100 Hz

2.9 Hz

Solution

Question 3

$$3.45\ Hz$$

$$34,500\ Hz$$

$$0.01\ Hz$$

$$100\ Hz$$

$$2.9\ Hz$$

Solution

Question 4

20 m

50 m

60 m

80 m

Solution

Question 5

A-1, B-2, C-3, D-4

A-2, B-1, C-4, D-3

A-3, B-1, C-4, D-2

A-4, B-3, C-2, D-1

Solution

Question 6

High, low

Low, high

Low, low

High, high

Solution

Question 7

The amplitude of vibrating body

The increase in surface area of vibrating body

The decrease in frequency of vibrating body

The increase in distance from the source of sound

Solution

Question 8

Vacuum

Solids

Liquids

Gases

Solution

Question 9

Grandparent

Little girl

Both

None of them

Solution

Question 10

Stretched -Membrane

Stretch-String

Air column

None of the above

Solution

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