Sound Test

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Sound Test - 17

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Weekly Quiz Competition

Question 1
1 / -0

Name the sounds of the frequencies given below $$10Hz$$.

A
$$ultrasonic$$

B
$$infrasonic$$

C
$$supersonic$$

D
None of the above

Solution

Infra-sound is a low-frequency sound. It is sound that is lower in frequency than $$20 \ Hz$$ or cycles per second, the normal limit of human hearing. Hearing becomes gradually less sensitive as frequency decreases, so for humans to perceive infrasound, the sound pressure must be sufficiently high. The ear is the primary organ for sensing infra-sound, but at higher intensities it is possible to feel infra-sound vibrations in various parts of the body.
Question 2
1 / -0

Ultrasound is of frequency

A
below $$20Hz$$

B
above $$20Hz$$

C
below $$20kHz$$

D
above $$20kHz$$

Solution

Ultrasound is an oscillating sound pressure wave with a frequency greater than the upper limit of the human hearing range. Ultrasound is thus not separated from normal (audible) sound by differences in physical properties, only by the fact that humans cannot hear it. Although this limit varies from person to person, it is approximately 20,000 hertz in healthy, young adults. Ultrasound devices operate with frequencies from 20 kHz up to several gigahertz.
Hence, Ultrasound is of frequency 20,000 Hz and above.
Question 3
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 4
1 / -0

The unit of frequency is:-

A
Hertz

B
Joule

C
Ohm

D
Kilo Calorie

Solution

Frequency is the number of complete vibrational cycles of a medium per a given amount of time. The frequency would have units of cycles/second, waves/second or vibrations/second. The unit for frequency is the Hertz (abbreviated Hz) where 1 Hz is equivalent to 1 cycle/second.
Question 5
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 6
1 / -0

Sound in air propagates in form of:

A
longitudinal wave

B
transverse wave

C
both longitudinal and transverse waves

D
neither longitudinal nor transverse wave.

Solution

Sound is transmitted from a source to the surrounding air particles, which vibrate or collide and pass the sound energy along to our ears. Without any particles to vibrate, we wouldn't hear the sound.
Sound is a mechanical wave that results from the back and forth vibration of the particles of the medium through which the sound wave is moving. If a sound wave is moving from left to right through air, then particles of air will be displaced both rightward and leftward as the energy of the sound wave passes through it. The motion of the particles is parallel to the direction of the energy transport. This is what characterizes sound waves in air as longitudinal waves.
Question 7
1 / -0

A transverse wave is composed of

A
trough

B
crest

C
both A & B

D
None

Solution

A transverse wave is a moving wave that consists of oscillations occurring perpendicular (or right angled) to the direction of energy transfer. If a transverse wave is moving in the positive x-direction, its oscillations are in up and down directions that lie in the yz plane.
Transverse waves have two parts, the crest and the trough. The crest is the highest point of the wave and the trough is the lowest. The distance between a crest and a trough is half of wavelength. The wavelength is the distance from crest to crest or from trough to trough.
Hence, a transverse wave is composed of crest and trough.
Question 8
1 / -0

When a stone is dropped on the surface of still water, the waves produced on the surface of the water are:

A
Stationary

B
Transverse

C
Longitudinal

D
None of the above

Solution

A transverse wave is a wave in which the individual particles of the medium move about their mean positions in a direction perpendicular to the direction of wave propagation.
When a stone is dropped on the surface of the water, the waves produced are transverse waves. The water molecules oscillate up and down about their mean position as the wave travels
Question 9
1 / -0

A longitudinal waves consists of

A
crest and troughs in the medium

B
compressions and rarefactions in the medium

C
crest and troughs in vacuum

D
Both A and B

Solution

Longitudinal waves are waves in which the displacement of the medium is in the same direction as, or the opposite direction to, the direction of travel of the wave. Longitudinal waves are also called compression waves or compression waves, because they produce compression and rarefaction when traveling through a medium. In longitudinal waves, the displacement of the particle's is parallel to the propagation of the wave.
Question 10
1 / -0

When we change sound to loud sound we increase its

A
frequency

B
amplitude

C
velocity

D
wavelength

Solution

Loudness depends on the square of the amplitude of the wave.
That is, $$loudness\propto { \left( amplitude \right) }^{ 2 }$$
Amplitude is the size of the vibration, and this determines how loud the sound is. Larger vibrations make larger amplitude, hence, louder the sound.

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Re-Attempt Weekly Quiz Competition

Sound Test - 17

Result

Sound Test - 17

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SHARING IS CARING

Question 1

$$ultrasonic$$

$$infrasonic$$

$$supersonic$$

None of the above

Solution

Question 2

below $$20Hz$$

above $$20Hz$$

below $$20kHz$$

above $$20kHz$$

Solution

Question 3

ultrasonic

infrasonic

both A & B

cant say

Solution

Question 4

Hertz

Joule

Ohm

Kilo Calorie

Solution

Question 5

1 vibration per minute.

360 vibration per minute.

10 vibration per minute.

60 vibration per minute.

Solution

Question 6

longitudinal wave

transverse wave

both longitudinal and transverse waves

neither longitudinal nor transverse wave.

Solution

Question 7

trough

crest

both A & B

None

Solution

Question 8

Stationary

Transverse

Longitudinal

None of the above

Solution

Question 9

crest and troughs in the medium

compressions and rarefactions in the medium

crest and troughs in vacuum

Both A and B

Solution

Question 10

frequency

amplitude

velocity

wavelength

Solution

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