Sound Test

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Sound Test - 62

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Weekly Quiz Competition

Question 1
1 / -0

Select the instrument that works on the principle of multiple reflection of sound.

A
Watthour meter

B
Sonar

C
Stethoscope

D
Decibel meter

Solution

The sound of a heartbeat ( or lungs ) reaches the doctor's ears by the multiple reflections of sound waves through the stethoscope tube. The propagation of sound is shown in the figure.
Question 2
1 / -0

A tuning fork is excited by striking it with a padded hammer. What would be the nature of the vibrations executed by the prongs as well as the stem of the fork respectively ? (The reference direction is that of the propagation of the sound wave.)

A
Both vibrate longitudinally

B
Both vibrate transversely

C
The prong vibrate longitudinally whereas the stem vibrates transversely

D
The prong vibrate transversely whereas the stem vibrates longitudinally

Solution

A wave in which particles of the medium vibrate in the direction of propagation of wave is known as longitudinal wave. A wave in which the particles of the medium vibrate perpendicular to the direction of propagation is known as transverse wave.

When a tuning fork is excited with a padded hammer, the inward and outward motion of the prongs creates a compression and rarefaction of air molecules near the prongs, thus generating a longitudinal wave.

The two waves collide in the middle of prongs and transfer a wave into the stem of the tuning fork. In the stem, the pressure deviations of the wave causes stress along the perpendicular direction of the propagation of wave, thus creating a transverse wave.
Question 3
1 / -0

Change in temperature of the medium changes:

A
frequency of sound waves

B
amplitude of sound waves

C
wavelength of sound waves.

D
loudness of sound waves

Solution

Change in temperature of the medium changes the velocity of sound waves and hence the wavelength of sound waves. This is because frequency $$\left(\upsilon =\dfrac{\nu}{\lambda}\right)$$ is fixed.
Question 4
1 / -0

A chain of hydrogen bombs is being exploded every time in the sun due to the fusion process, yet you do not hear the sound, because.

A
The sound so generated is absorbed by various layers of the sun

B
The sound so generated dissipates away

C
The sun is very far away

D
The space between the sun and the earth is void

Solution

The space between the sun and the earth is void. Sound needs a medium to propagate. We cannot hear any sound on the surface of earth as there is no medium in between.
Question 5
1 / -0

SONAR emits which of the following waves?

A
Radio waves

B
Micro waves

C
Ultrasonic waves

D
Gamma rays

Solution

Correct Answer: Option (C)

Hint: Sonar uses ultrasonic waves to sight associate in nursing objects within the ocean.

Explanation: SONAR is a device that sends ultrasonic waves it is used in the ships to ensure that there is nothing down beneath the ships These square measure high-frequency sound waves that don't seem to be lost within the approach because of high energy.
Question 6
1 / -0

A sound wave has a frequency of $$10$$kHz and wavelength $$3$$mm. How much time will it take to travel $$3$$ metre?

A
$$0.1$$ sec

B
$$1$$ sec

C
$$10$$ sec

D
$$0.01$$ sec

Solution

$$V=f\times \lambda$$
$$=10\times 10^3\times 3\times 10^{-3}=30$$
$$t=\displaystyle\frac{d}{v}=\frac{3}{30}=0.1$$sec.
Question 7
1 / -0

A sound wave is passing through air column in the form of compression and rarefaction. In consecutive compression and rarefaction:

A
density remains constant

B
Boyle's law is obeyed

C
bulk modulus of air oscillates

D
there is no transfer of heat

Solution

There is no transfer of heat from compression to rarefaction as air is a bad conductor of heat. And time of compression/rarefaction is too small.
Question 8
1 / -0

An empty vessel produces louder sound than a filled one because.

A
The liquid in the filled vessel absorbs the vibrations of the liquid molecules

B
The air molecules in empty vessel have greater amplitude and hence greater intensity than liquid molecules in the filled vessel

C
The density of air is less than the density of liquid contained in the vessel when filled

D
The kinetic energy of particles constituting the air column is greater as compared to the kinetic energy of particles of liquid column

Solution

An empty vessel produces louder sound than a filled one because the air molecules in empty vessel have greater amplitude and hence greater intensity than liquid molecules in the filled vessel
Question 9
1 / -0

The amplitude of vibratory motion is measured in units of

A
length

B
time

C
speed

D
Hz

Solution

Amplitude is the maximum displacement of a particle undergoing vibration. Thus, it will be measured in terms of length.

The correct option is (a)
Question 10
1 / -0

If A is the amplitude of vibration, then the time taken by a wave to cover a distance of 4A is known as

A
Time period

B
Half the time period

C
1 s

D
0.1 s

Solution

Time required to complete one vibration is T secs

In one full vibration, the particle covers a total distance of 4A

Thus, time required to cover a total distance of 4A during one vibration is T secs or 1 Time period

The correct option is (a)

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Re-Attempt Weekly Quiz Competition

Sound Test - 62

Result

Sound Test - 62

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Rank

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SHARING IS CARING

Question 1

Watthour meter

Sonar

Stethoscope

Decibel meter

Solution

Question 2

Both vibrate longitudinally

Both vibrate transversely

The prong vibrate longitudinally whereas the stem vibrates transversely

The prong vibrate transversely whereas the stem vibrates longitudinally

Solution

Question 3

frequency of sound waves

amplitude of sound waves

wavelength of sound waves.

loudness of sound waves

Solution

Question 4

The sound so generated is absorbed by various layers of the sun

The sound so generated dissipates away

The sun is very far away

The space between the sun and the earth is void

Solution

Question 5

Radio waves

Micro waves

Ultrasonic waves

Gamma rays

Solution

Question 6

$$0.1$$ sec

$$1$$ sec

$$10$$ sec

$$0.01$$ sec

Solution

Question 7

density remains constant

Boyle's law is obeyed

bulk modulus of air oscillates

there is no transfer of heat

Solution

Question 8

The liquid in the filled vessel absorbs the vibrations of the liquid molecules

The air molecules in empty vessel have greater amplitude and hence greater intensity than liquid molecules in the filled vessel

The density of air is less than the density of liquid contained in the vessel when filled

The kinetic energy of particles constituting the air column is greater as compared to the kinetic energy of particles of liquid column

Solution

Question 9

length

time

speed

Hz

Solution

Question 10

Time period

Half the time period

1 s

0.1 s

Solution

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