Sound Test

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Sound Test - 38

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Weekly Quiz Competition

Question 1
1 / -0

How do dolphins and whales communicate?

A
By generating ultrasounds

B
By using echolocation

C
Both A and B

D
None of the above

Solution

Echolocation is a technique used by bats, dolphins and other animals to determine the location of objects using reflected ultrasound waves which were generated by these organisms. This allows the animals to move around in pitch darkness, so they can navigate, hunt, identify friends and enemies, and avoid obstacles.
Dolphins and whales make use of ultrasounds to communicate with one another and for echolocation to hunt food and to find objects in their path.
Hence both A and B are correct.
Question 2
1 / -0

Why can supernova explosions in space be seen but not heard on earth?

A
Because sound cannot travel in vacuum but light can.

B
Because light cannot travel in vaccum but sound can

C
Because sound produced is beyond audible range of human ears.

D
None of these.

Solution

Light does not require a medium to travel through but sound requires a medium to travel, so it cannot be transmitted through space. That is why we are able to see the supernova explosions but cannot hear them.
Question 3
1 / -0

Sound cannot pass through me.I am?

A
Vacuum

B
Glass

C
Water

D
Wood

Solution

Sound is a mechanical wave.And mechanical waves needs a material medium to carry it's vibrations .So sound requires a medium to propagate.And vaccum is just empty space , it does not have any medium .So sound cannot pass through vaccum.
Question 4
1 / -0

Which part of the ear increases the size of the vibrations of sound waves entering the ear?

A
Outer ear

B
Ear canal

C
Middle ear

D
Inner ear
Question 5
1 / -0

Sound of frequency below 20 Hz is called

A
Audio sounds

B
Infrasonics

C
Ultrasonics

D
Supersonics
Question 6
1 / -0

Sound travels through air at 343 m/s at $$20^{\circ}\, C$$. A bat emits an ultrasonic squeak and hears the echo 0.05 s later. How far away was the object that reflected it?

A
$$7.5 \ m$$

B
$$8.5 \ m$$

C
$$9.5 \ m$$

D
$$10.5 \ m$$

Solution

Let distance of object from bat be $$d$$.
Since the sound must travel to the object and back to the bat, the sound travels $$2d$$ distance.
We have speed of sound=$$343 m/s$$
$$time=t= 0.05 s$$
$$speed=\dfrac{distance}{time}$$
$$distance=2d=speed\times time=343 \times 0.05$$
$$2d=17.15m$$
$$d=8.575m$$
Question 7
1 / -0

Bats can fly in the dark because

A
They can see better in the dark

B
The pupils of their eyes are very wid

C
They are guided by ultrasonic waves which they produce

D
They are guided by micro - waves which they produce

Solution

Bats can fly in the dark because they. Bat echolocation is very much similar to a SONAR and is a perceptual system where ultrasonic sounds are emitted specifically to produce echoes.
Question 8
1 / -0

Sound wave travels as:

A
Transverse waves

B
Longitudinal waves

C
Airwaves

D
None of the above

Solution

Sound waves are longitudinal waves.Longitudinal waves are waves in which direction of propagation of wave is same as direction of movement of medium particles in which wave is moving.When sound travels in air it's propagation direction is same as direction of movement of air molecules.
Hence sound is a longitudinal wave.
Question 9
1 / -0

Sound waves in air are

A
Transverse

B
Longitudinal

C
Electromagnetic

D
None of these

Solution

Sound waves are longitudinal waves.Longitudinal waves are waves in which direction of propagation of wave is same as direction of movement of medium particles in which wave is moving.When sound travels in air it's propagation direction is same as direction of movement of air molecules.
Hence sound is a longitudinal wave.
Question 10
1 / -0

Which sound property determine 'Loudness'?

A
Amplitude

B
Frequency

C
Wavelength

D
Speed

Solution

Loudness of sound means how much is the intensity of sound produced.
Loudness of sound wave is directly proportional to square of amplitude of vibration of sound source.Hence amplitude determine loudness.

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Re-Attempt Weekly Quiz Competition

Sound Test - 38

Result

Sound Test - 38

Score

-

Rank

-

SHARING IS CARING

Question 1

By generating ultrasounds

By using echolocation

Both A and B

None of the above

Solution

Question 2

Because sound cannot travel in vacuum but light can.

Because light cannot travel in vaccum but sound can

Because sound produced is beyond audible range of human ears.

None of these.

Solution

Question 3

Vacuum

Glass

Water

Wood

Solution

Question 4

Outer ear

Ear canal

Middle ear

Inner ear

Question 5

Audio sounds

Infrasonics

Ultrasonics

Supersonics

Question 6

$$7.5 \ m$$

$$8.5 \ m$$

$$9.5 \ m$$

$$10.5 \ m$$

Solution

Question 7

They can see better in the dark

The pupils of their eyes are very wid

They are guided by ultrasonic waves which they produce

They are guided by micro - waves which they produce

Solution

Question 8

Transverse waves

Longitudinal waves

Airwaves

None of the above

Solution

Question 9

Transverse

Longitudinal

Electromagnetic

None of these

Solution

Question 10

Amplitude

Frequency

Wavelength

Speed

Solution

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