Sound Test

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Sound Test - 51

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Weekly Quiz Competition

Question 1
1 / -0

Repetitions of sound due to the reflection of original sound heard by a large and hard obstacle is known as:

A
Compression

B
Rarefaction

C
Persistence of hearing

D
Echo

Solution

A repeated sound is caused by the reflection of the sound waves from the surface. The sound is heard more than once because of the time difference between the initial production of the sound waves and their return from the reflecting surface. For example, when we shout or clap near a suitable reflecting object such as a tall building or a mountain, we will hear the same sound again a little later.
Question 2
1 / -0

As the temperature of the medium increases,

A
Speed of sound increases

B
Speed of sound decreases

C
No effect on speed of sound

D
May increase or decrease

Solution

As the temperature of the medium increases the particles of the medium collide more frequently and hence the disturbance spreads faster.
$$v \propto \sqrt{T} $$
$$v$$; the speed of the sound
$$T$$; Temperature of the medium
Question 3
1 / -0

Sound of explosion taking on other planets are not heard by a person on the earth. Why?

A
The sound of explosion is not so high to reach the earth.

B
Only air is present between the planets and the earth

C
There is a region of vacuum in between the planets and the earth

D
The distance between the planets and the earth is too large for the sound to travel.

Solution

Sound needs a material medium for its propagation from one place to another place. In other words sound cannot travel through vacuum. Since there is a region between the planets and the earth, where there is a vacuum, so the sound of explosions taking place on other planets cannot pass through this vacuum.
Question 4
1 / -0

Two astronauts on the surface of the moon cannot talk to each other. Why

A
There is no atmosphere on the surface of the moon

B
There is no medium in between the two astronauts

C
The sounds cant propagate

D
All

Solution

There is no atmosphere on the surface of the moon. Since there is no medium in between, the sound cannot travel from one astronaut to the another astronaut on the surface of the moon.
Question 5
1 / -0

Reverberation time of a hall used for speeches should be very short. Why?

A
Multiple echos will enhance the sound quality.

B
Multiple echos will interfere with the original sound

C
Both a and b

D
None of the above

Solution

Reverberation time of a hall used by speeches should be very small so that it reduces multiple echoes to occur which may interfere with the original sound of the speech.
Question 6
1 / -0

Mark the correct statement .
i) rock music also becomes less pleasing with excessive reverberation.
ii) excessive reverberation is desirable in case of orchestral and choral music.
iii) excessive reverberation makes the speech of a person indistinct.

A
i, ii

B
ii, iii

C
i, iii

D
all

Solution

Reverberation is the phenomenon of persistence of sound after it has been stopped as a result of multiple reflections from surfaces such as furniture, people, air etc. within a closed surface. But the excessive reverberation is undesirable as the sound produced will continue to be heard repeatedly while the next sound being sent forth. This is unpleasant to hear and there is no clarity of sound.
It makes a person's speech indistinct.And excessive reverberation also reduces the quality of rock and choral , orchestral music.
So, all the statements are correct.
Question 7
1 / -0

The persistence of audible sound due to the successive reflections from the surrounding objects even after the source has stopped to produce that sound is called

A
reflection

B
echo

C
reverberation

D
rarefaction

Solution

According to the definition of reverberation, it is the persistence of audible sound due to the successive reflections from the surrounding objects even after the source has stopped to produce that sound.
Question 8
1 / -0

An echo is heard on a day when temperature is about$${22}^{0}$$C. Will echo be heard sooner or later, if the temperature increases to $${40}^{0}$$C?

A
at higher temperature sound travels faster

B
at higher temperature sound reflects

C
at higher temperature sound travels slower

D
none of these

Solution

As temperature increases, the speed of sound also increases. As temperature decreases, the speed of sound also decreases.
Question 9
1 / -0

During winter, an echo is heard

A
sooner than during summer

B
later than during summer

C
after same time as during summer

D
never

Solution

During summer the kinetic energy of particles of air is higher so they travel faster and hence the echo is heard later in winter.
Question 10
1 / -0

SONAR works on the Principle of :

A
reflection of sound

B
reflections of waves

C
infrasonic waves.

D
all of the above

Solution

Sonar is based on the principle of reflection of sound wave (echo). It is used to measure the depth of sea.

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Re-Attempt Weekly Quiz Competition

Sound Test - 51

Result

Sound Test - 51

Score

-

Rank

-

SHARING IS CARING

Question 1

Compression

Rarefaction

Persistence of hearing

Echo

Solution

Question 2

Speed of sound increases

Speed of sound decreases

No effect on speed of sound

May increase or decrease

Solution

Question 3

The sound of explosion is not so high to reach the earth.

Only air is present between the planets and the earth

There is a region of vacuum in between the planets and the earth

The distance between the planets and the earth is too large for the sound to travel.

Solution

Question 4

There is no atmosphere on the surface of the moon

There is no medium in between the two astronauts

The sounds cant propagate

All

Solution

Question 5

Multiple echos will enhance the sound quality.

Multiple echos will interfere with the original sound

Both a and b

None of the above

Solution

Question 6

i, ii

ii, iii

i, iii

all

Solution

Question 7

reflection

echo

reverberation

rarefaction

Solution

Question 8

at higher temperature sound travels faster

at higher temperature sound reflects

at higher temperature sound travels slower

none of these

Solution

Question 9

sooner than during summer

later than during summer

after same time as during summer

never

Solution

Question 10

reflection of sound

reflections of waves

infrasonic waves.

all of the above

Solution

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