Sound Test

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Sound Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

Pitch of a voice refers to the

A
quality of sound

B
frequency of sound

C
intensity of sound

D
chord of sound
Question 2
1 / -0

If two men talk on the moon's surface,

A
they hear each other with lower frequency.

B
they hear each other with higher frequency.

C
they can only hear each other.

D
they can't hear each other.

Solution

Sound cannot travel through the vacuum or space.
Question 3
1 / -0

On which of the following phenomena do bats rely the most to find their way in the dark?

A
Bats have a very high pressure sensitivity in their skin, which can differentiate the pressure differences when they are flying about.

B
Bats have the best night vision of all the nocturnal animals and can see even in the absence of any ambient light.

C
Bats use a system akin to SONAR in which they are guided by ultrasonic waves which they produce.

D
Bats employ thermal imaging very well.

Solution

Bats can fly in the dark without hitting obstacles because they are guided by the ultrasonic waves which they produce.
Question 4
1 / -0

What are ultrasonic waves?

A
Sound waves having frequency less than the audio frequency range.

B
Sound waves produced in vacuum.

C
Sound waves having frequency higher than audio frequency range.

D
None of these.

Solution

Ultrasound is an acoustic (sound) energy in the form of waves having a frequency above the human hearing range. The highest frequency that the human ear can detect is approximately 20 thousand cycles per second (20,000 Hz). This is where the sonic range ends, and where the ultrasonic range begins.
Question 5
1 / -0

The velocity of sound in air at 0^oC is

A
332 m/s

B
1500 m/s

C
2500 m/s

D
5000 m/s
Question 6
1 / -0

Which of the following statements is wrong?

A
Velocity of light in vacuum is 3 x 10⁸ m/s.

B
Sound travels faster in dry air than in the moist air.

C
The audible frequency range for human being is 20 Hz - 20000 Hz.

D
Sound waves do not propagate in vacuum.
Question 7
1 / -0

The distance between two successive crests or trough is 1 m, and the velocity of the waves is 320 m/s. Find out the frequency.

A
320 Hz

B
430 Hz

C
306 Hz

D
400 Hz
Question 8
1 / -0

A body is vibrating 6,000 times in one minute. If the velocity of sound in air is 360 m/s, find the wavelength of waves produced.

A
100 m

B
3.6 m

C
16.6 m

D
none of these

Solution

Frequency = Number of vibrations per second
Now, if a body is vibrating 6000 times per minute, it will vibrate 6000/60 times per second.
So, its frequency will be = 6000/60 = 100 Hz
Now, the wavelength is given as the ratio of speed and frequency.
Here, speed = 360 m/s
So,
Wavelength = 360 / 100
Wavelength = 3.6 m

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Re-Attempt Weekly Quiz Competition

Sound Test - 3

Result

Sound Test - 3

Score

-

Rank

-

SHARING IS CARING

Question 1

quality of sound

frequency of sound

intensity of sound

chord of sound

Question 2

they hear each other with lower frequency.

they hear each other with higher frequency.

they can only hear each other.

they can't hear each other.

Solution

Question 3

Bats have a very high pressure sensitivity in their skin, which can differentiate the pressure differences when they are flying about.

Bats have the best night vision of all the nocturnal animals and can see even in the absence of any ambient light.

Bats use a system akin to SONAR in which they are guided by ultrasonic waves which they produce.

Bats employ thermal imaging very well.

Solution

Question 4

Sound waves having frequency less than the audio frequency range.

Sound waves produced in vacuum.

Sound waves having frequency higher than audio frequency range.

None of these.

Solution

Question 5

332 m/s

1500 m/s

2500 m/s

5000 m/s

Question 6

Velocity of light in vacuum is 3 x 108 m/s.

Sound travels faster in dry air than in the moist air.

The audible frequency range for human being is 20 Hz - 20000 Hz.

Sound waves do not propagate in vacuum.

Question 7

320 Hz

430 Hz

306 Hz

400 Hz

Question 8

100 m

3.6 m

16.6 m

none of these

Solution

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Velocity of light in vacuum is 3 x 10⁸ m/s.