Sound Test

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Sound Test - 53

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Weekly Quiz Competition

Question 1
1 / -0

The waves remain undeviated over long distances:

A
ultrasonic waves

B
infrasonic waves

C
longitudinal waves

D
all

Solution

The ultrasound beam having higher frequencies is more directional and can be aimed towards any target just like a torch. Thus ultrasonic waves remain undeviated over long distances.
Question 2
1 / -0

Which of the following is not an application of ultrasound?

A
Used to kill bacteria in liquids.

B
Used to find faults and cracks in metals.

C
Used in metal refining.

D
all

Solution

Ultrasound has no use in metal refining.
But it is used to kill bacteria in liquids. Thus the liquid can be preserved for long time.
Ultrasound are thrown on a metal under investigation for any sort of cracks or faults.
Question 3
1 / -0

An ultrasonic wave is sent from a ship towards the bottom of the sea. It is found that the time interval between the sending and receiving of the wave is 1.6 s. What is the depth of the sea, if the velocity of sound in the seawater is 1400 m/s?

A
1120 m

B
560 m

C
1400 m

D
112 m

Solution

Given,
Velocity, $$V=1400\,m/s$$
Time $$t=1.6 \ s$$
Depth of the sea $$d = ?$$
In 1.6 sec, the sound wave travels from the ship to the bottom of the sea and then comes back to the ship because of the reflection by the sea bed. Thus the distance covered by the sound wave is twice the depth of the sea.
$$\therefore \text {distance} = 2 \times \text {the depth of the sea} (d)$$

We know
$$\text {Distance} = \text{speed} \times \text{time}$$
$$\Rightarrow 2d=V\times t$$
$$\Rightarrow d=\dfrac{1400\times 1.6}{2}$$
$$\Rightarrow d =700\times 1.6 = 1120 \space m $$

$$\therefore$$ option A is correct.
Question 4
1 / -0

A device based on multiple reflection used as hearing aid.

A
bulb horn

B
ear trumpet

C
megaphone

D
all

Solution

Ear trumpet or hearing aid is used by the persons who are hard of hearing. The sound waves received by the wide end of the trumpet are reflected into a much narrower area.
Question 5
1 / -0

In an auditorium or big hall excessive reverberation is highly _______.

A
Undesirable

B
Desirable

C
Zero

D
None of the above

Solution

The sound created in a big hall will persist by repeated reflection from the walls until it is reduced to a value where it is no longer audible. The repeated reflection that results in this persistence of sound is called reverberation. In an auditorium or big hall, excessive reverberation is highly undesirable.
Question 6
1 / -0

Loud sound can travel a __________ distance as it is associated with_________ energy.

A
Larger, higher

B
Smaller, lower

C
Smaller, higher

D
All can be true according to the conditions.

Solution

Loud sound can travel a larger distance as it is associated with higher energy. A sound wave spreads out from its source. As it moves away from the source, its amplitude as well as its loudness decreases.
Question 7
1 / -0

The ultrasound waves can penetrate into matter to a large extent because they have:

A
very high speed

B
very high frequency

C
very high wavelength

D
very high amplitude

Solution
Question 8
1 / -0

How does sound from a sound producing body travel through air to reach our ears?

A
through crest and troughs

B
through compression and rarefaction

C
both

D
none

Solution

Sound from a sound producing body travel through air to reach our ears by making regular compression and rarefaction.
Where compressions are regions of high pressure where particles of medium are closer. And rarefactions are regions of low pressure where particles of medium are farther from each other.
Question 9
1 / -0

Megaphones or loudhailers, horns, musical instruments such as trumpets and shehnais, are all designed to ______.

A
send sound in a particular direction without spreading it in all directions.

B
send sound in a particular direction spreading it in all directions.

C
collect sound from all directions spreading it in all directions.

D
all of the above

Solution

Megaphones or loudhailers, horns, musical instruments such as trumpets and shehnais, are all designed to send sound in a particular direction without spreading it in all direction.
In these instruments, a tube followed by a conical opening reflects sound successively to guide most of the sound waves from the source in the forward direction towards the audience.
Question 10
1 / -0

Explain why, if we strike a table lightly, we hear a soft sound but if we hit the table hard, a loud sound is heard.

A
when a table is striked lightly, vibrations are produced with less amplitude.

B
when the table is strikes hard, the amplitude is high.

C
both A and B

D
none

Solution

If we strike a table lightly the vibrations produced have less amplitude than when we strike the table hard. Since loudness depends on amplitude, soft sound is heard when we strike lightly.

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Re-Attempt Weekly Quiz Competition

Sound Test - 53

Result

Sound Test - 53

Score

-

Rank

-

SHARING IS CARING

Question 1

ultrasonic waves

infrasonic waves

longitudinal waves

all

Solution

Question 2

Used to kill bacteria in liquids.

Used to find faults and cracks in metals.

Used in metal refining.

all

Solution

Question 3

1120 m

560 m

1400 m

112 m

Solution

Question 4

bulb horn

ear trumpet

megaphone

all

Solution

Question 5

Undesirable

Desirable

Zero

None of the above

Solution

Question 6

Larger, higher

Smaller, lower

Smaller, higher

All can be true according to the conditions.

Solution

Question 7

very high speed

very high frequency

very high wavelength

very high amplitude

Solution

Question 8

through crest and troughs

through compression and rarefaction

both

none

Solution

Question 9

send sound in a particular direction without spreading it in all directions.

send sound in a particular direction spreading it in all directions.

collect sound from all directions spreading it in all directions.

all of the above

Solution

Question 10

when a table is striked lightly, vibrations are produced with less amplitude.

when the table is strikes hard, the amplitude is high.

both A and B

none

Solution

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