Sound Test

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Sound Test - 44

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Weekly Quiz Competition

Question 1
1 / -0

The frequency of sound waves in water is

A
Same as that of frequency of source

B
Less than frequency of source

C
More than frequency of source

D
Can't say

Solution

Frequency of a wave is characterised by the source of the wave, which produces disturbance, therefore it doesn't change when medium is changed. So frequency will not change in water and will be same as the frequency of source.
Question 2
1 / -0

The waves produced by a motor boat sailing in water are

A
transverse

B
longitudinal

C
longitudinal and transverse

D
stationary

Solution

When a motor boat sails in water, waves will be produced on the surface of the water. Water waves are a combination of longitudinal and transverse waves as the particles move in a circular path. We can't classify them as purely longitudinal or purely transverse waves.
Question 3
1 / -0

A stone is dropped from the top of a tower $$500\ m$$ high into a pond of water at the base of the tower. When is the splash heard at the top? (Given $$g = 10 \ ms^{-2}$$ and speed of sound $$ = 340\ ms^{-1}$$)

A
$$10\ s$$

B
$$11.47\ s$$

C
$$1.10\ s$$

D
$$20\ s$$

Solution

Given,
Height of the tower, $$h= 500\ m$$
Initial velocity, $$u= 0$$
Acceleration due to gravity, $$g=10\ m/s^2$$
Speed of sound, $$v_s=340\ m/s$$

Let $$t_1$$ be the time taken by the stone to reach the surface of the pond.

Using Newton's second equation of motion,
$$s=ut+\dfrac 12at^2$$

$$500=(0\times t_1)+\dfrac 12 (10\times t_1^2)$$

$$500=5t_1^2$$
$$\implies t_1=\sqrt{100}$$
$$t_1=10\ s$$

Let $$t_2$$ be the time taken by the sound of the stone to reach the top.
We know,
$$speed=\dfrac{distance}{time}$$

$$\implies time=\dfrac{distance}{speed}$$

$$t_2=\dfrac{h}{v_s}$$

$$t_2=\dfrac{500}{340}$$

$$t_2=1.47\ s$$

Total time after which the splash will be heard, $$T=t_1+t_2$$
$$T=10+1.47$$
$$T=11.47\ s$$
Question 4
1 / -0

Which of the following type of waves is used in the SONAR device?

A
radio waves

B
audible sound waves

C
infrasonic waves

D
ultrasonic waves

Solution

Answer is D.

SONAR is the best example that illustrates how a ship on the ocean utilizes the reflecting properties of sound waves to determine the depth of the ocean. A sound wave is transmitted and bounces off the seabed. Because the speed of sound is known and the time lapse between sending and receiving the sound can be measured, the distance from the ship to the bottom of the ocean can be determined. This technique is called sonar (SOund Navigation And Ranging).
A common use of ultrasound is in SONAR. Ultrasonic waves are used in SONAR instead of audible sound waves.
Question 5
1 / -0

In a slinky

A
Both transverse pulse as well as longitudinal pulse can be generated

B
Both types of pulse cannot be generated

C
Only a transverse pulse can be generated

D
Only a longitudinal pulse can be generated

Solution

Slinky is a helical spring toy. By fixing one end on a rigid support and holding the other end waves can be generated. By moving it back and forth, longitudinal waves can be generated. By moving up and down, transverse can be made.
Question 6
1 / -0

The speed of a sound wave is $$330\ ms^{-1}$$ and its frequency is $$550\ Hz$$. What is its wavelength?

A
$$0.4\ m$$

B
$$4\ m$$

C
$$0.6\ m$$

D
$$6\ m$$

Solution

The relation between wavelength $$(\lambda)$$, speed of wave$$(v)$$, and frequency of wave$$(f)$$ is-
$$v = f \lambda$$
$$\lambda = \dfrac{ v }{ f }$$
$$v = 330 ms^{-1}$$
$$f = 550\ Hz$$
$$\Rightarrow \lambda = \dfrac{ 330 }{ 550 }$$
$$\Rightarrow \lambda = 0.6\ m$$
Question 7
1 / -0

The walls and ceiling of an auditorium are covered with a fibrous material to

A
Make the auditorium fire proof

B
Absorb sound and prevent echoes

C
Give an ethnic look to the auditorium

D
To prevent leakage of water from the roof

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. To reduce reverberation, the roof and walls of the auditorium are generally covered with sound-absorbent materials like compressed fibreboard, rough plaster or draperies. We know that such soft, porous and fibrous materials are good absorbers of sound. The seat materials are also selected on the basis of their sound absorbing properties.
Question 8
1 / -0

The distance between two consecutive compressions and rarefaction is 1.7 m. The wavelength of the wave is.

A
2.8 m

B
3.4 m

C
0.7 m

D
4.2 m

Solution

Wavelength $$\lambda$$ is defined as the distance between two consecutive compressions or rarefactions, therefore the distance between consecutive compression and rarefaction will be $$\lambda/2$$,
Given,
$$\lambda/2=1.7$$

Therefore,
Wavelength of the wave, $$\lambda=2\times1.7=3.4\ m$$
Question 9
1 / -0

The maximum speed of vibrations which produce audible sound will be in ________.

A
Dry air

B
Sea water

C
Metal

D
human blood

Solution

solids have highest velocity of sound in them among all phases so a metal being a solid has very high velocity of sound.
so the answer is C.
Question 10
1 / -0

Which of the following are the properties of a sound produced by a guitar?:

A
Pitch and loudness

B
Loudness and timbre

C
Pitch and timbre

D
All of the above
Solution
The answer is D.
- Pitch is the property of a sound which is decided by the frequency of the sound.
- Loudness is the property of a sound which is decided by the amplitude of the sound.
- Timbre is the property of a sound which is decided by the waveform of the sound.
The sound produced by a guitar has a particular amplitude, frequency, and waveform. Therefore, this sound will have a particular pitch, loudness, and timbre.

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Re-Attempt Weekly Quiz Competition

Sound Test - 44

Result

Sound Test - 44

Score

-

Rank

-

SHARING IS CARING

Question 1

Same as that of frequency of source

Less than frequency of source

More than frequency of source

Can't say

Solution

Question 2

transverse

longitudinal

longitudinal and transverse

stationary

Solution

Question 3

$$10\ s$$

$$11.47\ s$$

$$1.10\ s$$

$$20\ s$$

Solution

Question 4

radio waves

audible sound waves

infrasonic waves

ultrasonic waves

Solution

Question 5

Both transverse pulse as well as longitudinal pulse can be generated

Both types of pulse cannot be generated

Only a transverse pulse can be generated

Only a longitudinal pulse can be generated

Solution

Question 6

$$0.4\ m$$

$$4\ m$$

$$0.6\ m$$

$$6\ m$$

Solution

Question 7

Make the auditorium fire proof

Absorb sound and prevent echoes

Give an ethnic look to the auditorium

To prevent leakage of water from the roof

Solution

Question 8

2.8 m

3.4 m

0.7 m

4.2 m

Solution

Question 9

Dry air

Sea water

Metal

human blood

Solution

Question 10

Pitch and loudness

Loudness and timbre

Pitch and timbre

All of the above

Solution

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