Sound Test

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Sound Test - 12

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following frequencies of sound elephants produce ?

A
ultrasonic

B
infrasonic

C
both A & B

D
cant say

Solution

Some of the elephant's vocalizations are infrasonic, and thus are inaudible to humans. The prominence of very low frequencies in the vocalizations is a defining characteristic of all three species of elephants. Sounds are generally considered to be infrasonic if their frequency is less than $20 Hz$ (the lower limit of human hearing). Low frequency sounds travel farther than high frequency ones, which make them ideal for long distance communication.
Hence, Elephants produce infrasonic sound.
Question 2
1 / -0

1 Hz is:

A
1 vibration per minute.

B
360 vibration per minute.

C
10 vibration per minute.

D
60 vibration per minute.

Solution

Frequency of 1 Hz implies to 1 complete vibration per second. This means, 60 complete vibrations in 60 second, or, in 1 minute.
Question 3
1 / -0

Frequency of the sound is equivalent to

A
Pitch

B
Wavelength

C
Amplitude

D
Waveform

Solution

Pitch describes how high or low a tone is and depends upon the rapidity with which a sounding body vibrates, i.e., upon the frequency of vibration. The higher the frequency of vibration, the higher the tone.
Frequency is the speed of the vibration, and this determines the pitch of the sound. Hence, the pitch of the sound is affected by the change in its frequency.
Question 4
1 / -0

Infrasound can be heard by

A
dog

B
bat

C
rhinoceros

D
human beings

Solution

Rhinos have extremely good ears, picking up infra-sound far deeper than the range of human hearing.
Rhinos, can hear down to a frequency of four hertz, whereas even a human baby, with entirely undamaged ears, can normally only pick up sounds as low as 20 hertz. Giraffes and elephants can also hear in this infra-sound range.
Question 5
1 / -0

Sound is produced in a bamboo flute because:

A
air starts vibrating

B
bamboo starts vibrating

C
air hits the bamboo

D
direction of air is changed

Solution

When we blow air in a bamboo flute by our mouth, we give energy to the medium which is the air inside the flute. It starts vibrating and produces sound, which we can control using our fingers to make sweet melodies.
Question 6
1 / -0

An object oscillates 50 times in one second. What would be its frequency?

A
0.2 hz

B
0.02 hz

C
0.002hz

D
50Hz

Solution

Frequency is defined as the number of oscillations in one second , as the given object is oscillating , 50 times in one second therefore its frequency is 50 Hz .
Question 7
1 / -0

The difference between a muscial sound and noise is:

A
amplitude

B
loudness

C
vibration

D
all of the above

Solution

Musical sound is produced by a regular vibration whereas noise is produced by an irregular vibration.
Question 8
1 / -0

A source is producing 15 oscillations (waves) in 3 seconds. Find its frequency?

A
15 Hz

B
5 Hz

C
0.2Hz

D
0.66Hz

Solution

Frequency of a wave (as sound wave) is defined as the number of oscillations per second,
$f=\dfrac{\text{number of oscillations}}{\text{time (in seconds)}}$
Given:
No. of oscillations $=15$ , $time=3s$
$\therefore f=\dfrac{15}{3}=5 \ Hz$
Option (B) is correct.
Question 9
1 / -0

One can be recognised by his voice due to the uniqueness of:

A
quality

B
amplitude

C
pitch

D
all of the above

Solution

We can recognise any source of sound by uniqueness of quality . It is that characteristic of sound which enables us to distinguish between two sources of sound even of the same frequency (pitch) and amplitude .
Question 10
1 / -0

Noise pollution can cause:

A
insmonia

B
hypertension

C
hearing impairment

D
all of the above

Solution

Noise pollution is hazardous to health in many ways as it can cause insomnia, hypertension and hearing impairment.

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Re-Attempt Weekly Quiz Competition

Sound Test - 12

Result

Sound Test - 12

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Rank

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SHARING IS CARING

Question 1

ultrasonic

infrasonic

both A & B

cant say

Solution

Question 2

1 vibration per minute.

360 vibration per minute.

10 vibration per minute.

60 vibration per minute.

Solution

Question 3

Pitch

Wavelength

Amplitude

Waveform

Solution

Question 4

dog

bat

rhinoceros

human beings

Solution

Question 5

air starts vibrating

bamboo starts vibrating

air hits the bamboo

direction of air is changed

Solution

Question 6

0.2 hz

0.02 hz

0.002hz

50Hz

Solution

Question 7

amplitude

loudness

vibration

all of the above

Solution

Question 8

15 Hz

5 Hz

0.2Hz

0.66Hz

Solution

Question 9

quality

amplitude

pitch

all of the above

Solution

Question 10

insmonia

hypertension

hearing impairment

all of the above

Solution

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