Sound Test

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Sound Test - 22

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Weekly Quiz Competition

Question 1
1 / -0

A hummingbird beats its wings $$ 3,300$$ times per minute. Find out the frequency produced by the bird?

A
$$0.003\ Hz$$

B
$$0.018\ Hz$$

C
$$6\ Hz$$

D
$$55\ Hz$$

E
$$3300\ Hz$$

Solution

Beat frequency is given by, number of beats per second,
in the given case ,
frequency-
$$ f = 3300\ \text{beats per minute}$$

$$\Rightarrow f = \dfrac{3300}{60}\ \text{beats per second}$$

$$\Rightarrow f = 55\ Hz$$
Question 2
1 / -0

Which of the following voices is likely to have minimum frequency?

A
Baby girl

B
Baby boy

C
A man

D
A woman

Solution

A man’s sound is of the lower pitch as compared to the other options. And we know that pitch is directly proportional to the frequency of sound. So, the frequency of man’s voice will be the minimum among all the options.
Question 3
1 / -0

The property of ultrasonic waves used in manufacturing emulsion for photographic films is its ________.

A
High speed

B
High frequency

C
Higher wavelength

D
High amplitude

Solution

Frequencies higher than $$20\ kHz$$ are called ultrasonic sound or ultrasound. The property of ultrasonic waves in manufacturing emulsion for photographic films in its high frequency.
Question 4
1 / -0

Identify which of the following wave parameter is related to the pitch of a sound?

A
frequency

B
amplitude

C
wavelength

D
period

E
speed

Solution

Pitch of a sound is more or less a proxy for frequency of sound, how quickly the sound wave is making the air vibrate. However frequency is an objective, scientific attribute that can be measured. Pitch is each person's subjective perception of a sound wave, which cannot be directly measured.
Question 5
1 / -0

Identify which of the following wave parameter is related to the volume of a sound?

A
amplitude

B
speed

C
wavelength

D
period

E
frequency

Solution

Intensity is perceived as the volume of a sound.
The amplitude of a wave is the measure of the intensity that it carries.
The more the amplitude, the more would be the intensity, and hence more would be the volume of the sound heard.
Question 6
1 / -0

Elephants communicate with

A
Sonic sound

B
Infrasonic sound

C
Ultrasonic sound

D
None of these

Solution

Elephants can communicate using very low frequency sounds, with pitches below the range of human hearing. These low frequency sounds(frequency less than $$20Hz$$), termed infrasonic sounds, can travel several kilometers, and provide elephants with a private communication channel that plays an important role in elephants complex social life. Their frequencies are as low as the lowest notes of a pipe organ.
Question 7
1 / -0

The audible range in humans is ____________.

A
$$20 Hz$$ to $$2000 Hz$$

B
$$200 Hz$$ to $$20,000 Hz$$

C
$$20 Hz$$ to $$20,000 Hz$$

D
$$200 Hz$$ to $$20 kHz$$

Solution

Audible range of human ear is $$20Hz - 20000Hz$$
so the answer is C
Question 8
1 / -0

Which one has higher frequency?

A
Infrasonic sound

B
Ultrasonic sound

C
Audible sound

D
All of the above have same frequency

Solution

Audible sound has a frequency range of $$20 Hz$$ to $$20 \ kHz.$$
Infrasonic frequency is below audible range, i.e. below $$20 Hz$$.
Ultrasonic frequency is above audible range, i.e. above $$20KHz$$.
So the answer is B.
Question 9
1 / -0

A wave source produces $$10$$ oscillations in $$100\ ms$$. Find the time period of the wave.

A
$$1\ s$$

B
$$0.01\ s$$

C
$$10\ s$$

D
$$0.1\ s$$

Solution

The number of oscillations per unit time is known as frequency $$f$$.
The time period $$T$$ is the time needed to complete one cycle or vibration.
$$f=\dfrac 1T$$

Given,
Number of oscillations, $$N = 10$$
Time, $$t=100\ ms$$
$$t= 100\times 10^{-3}=0.1\ s$$

Frequency, $$f= \dfrac Nt$$

$$f=\dfrac{10}{0.1}$$

$$f= 100\ Hz$$

Time period, $$T=\dfrac 1f$$

$$T=\dfrac{1}{100}

$$T=0.01\ s$
Question 10
1 / -0

What is the unit for measuring the amplitude of a sound?

A
decibel

B
coulomb

C
hum

D
cycles

Solution

The amplitude of sound is measured in decibel following the Bel System.

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Re-Attempt Weekly Quiz Competition

Sound Test - 22

Result

Sound Test - 22

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Rank

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SHARING IS CARING

Question 1

$$0.003\ Hz$$

$$0.018\ Hz$$

$$6\ Hz$$

$$55\ Hz$$

$$3300\ Hz$$

Solution

Question 2

Baby girl

Baby boy

A man

A woman

Solution

Question 3

High speed

High frequency

Higher wavelength

High amplitude

Solution

Question 4

frequency

amplitude

wavelength

period

speed

Solution

Question 5

amplitude

speed

wavelength

period

frequency

Solution

Question 6

Sonic sound

Infrasonic sound

Ultrasonic sound

None of these

Solution

Question 7

$$20 Hz$$ to $$2000 Hz$$

$$200 Hz$$ to $$20,000 Hz$$

$$20 Hz$$ to $$20,000 Hz$$

$$200 Hz$$ to $$20 kHz$$

Solution

Question 8

Infrasonic sound

Ultrasonic sound

Audible sound

All of the above have same frequency

Solution

Question 9

$$1\ s$$

$$0.01\ s$$

$$10\ s$$

$$0.1\ s$$

Solution

Question 10

decibel

coulomb

hum

cycles

Solution

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