Sound Test

Result

Sound Test - 49

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Weekly Quiz Competition

Question 1
1 / -0

Which letter represents half the wavelength of the wave.

A
X

B
Y

C
Z

D
W

Solution

Wavelength of a wave is the distance between two successive regions of compression or the distance between into successive regions of rarefaction.
But, in wave form a wavelength is the distance between two successive crests or troughs.
Question 2
1 / -0

Velocity of air is 340 m/s. Calculate its frequency when wavelength is 17 cm.

A
2000 Hz

B
3400 Hz

C
170 Hz

D
none

Solution

We have the equation,

$$V=\lambda\times v$$

where,

$$V$$ is the velocity $$=340\,m/s$$

$$\lambda$$ is the wavelength

$$v$$ is the frequency

Given, $$\lambda=17 \ cm \,=0.17\,m$$

That is,

$$340=0.17\times v$$

$$v=\dfrac{340}{0.17}=2000\,Hz$$
Question 3
1 / -0

Distance between compression and consecutive rarefaction is $$100\ m$$. Calculate the wavelength of the wave.

A
$$100\ m$$

B
$$50\ m$$

C
$$200\ m$$

D
$$400\ m$$

Solution

Wavelength $$\lambda$$ of a wave is defined as the distance between two consecutive compressions or rarefactions. As we know that between two consecutive compressions, there is a rarefaction or vice-versa, therefore the distance between compression and consecutive rarefaction will be $$\dfrac \lambda 2$$.
Given, $$\dfrac \lambda 2=100m$$ ,
or, $$\lambda=2\times100=200m$$
Question 4
1 / -0

Sound waves from outside are collected by which part of the ear?

A
Cochlea

B
Malleus

C
Pinna

D
Ear drum

Solution

The outer ear is called the pinna. It collects the sound from the surroundings. Sound waves from outside are collected by it and are transferred to the inner parts.
Question 5
1 / -0

What stimulates the auditory nerve?

A
the movement of the three ear ossicles

B
the movement of stirrup

C
the movement of fluid in the cochlea

D
all

Solution

Cochlea is a coiled and fluid filled tube having sense of hearing. The movement of the fluid in the cochlea due to the vibrations stimulates the auditory nerve .
Question 6
1 / -0

In which of the following, the density of particles of the medium is lesser than the normal density?

A
Compression

B
Rarefaction

C
Reflection

D
None

Solution

The part of the longitudinal wave in which the density of the particles of the medium is lesser than the normal density is called rarefaction.
Question 7
1 / -0

Which of the following order is correct?

A
Sound $$\rightarrow$$ ear $$\rightarrow$$ inner ear $$\rightarrow$$ vibration of eardrum $$\rightarrow$$ brain $$\rightarrow$$ hearing

B
Ear $$\rightarrow$$ vibration of eardrum $$\rightarrow$$ Inner ear $$\rightarrow$$ hearing $$\rightarrow$$ brain $$\rightarrow$$ vibration

C
Sound $$\rightarrow$$ ear $$\rightarrow$$ inner ear $$\rightarrow$$ vibration of eardrum $$\rightarrow$$ hearing $$\rightarrow$$ brain

D
Sound $$\rightarrow$$ ear $$\rightarrow$$ vibration of eardrum $$\rightarrow$$ inner ear $$\rightarrow$$ brain $$\rightarrow$$ hearing

Solution

When sound strikes the eardrum, it vibrates and this vibration is carried to the inner ear from where it is carried to the brain in the form of impulse. The brain then gives the signal and we hear the sound.
Question 8
1 / -0

The waves in which the particles of the medium vibrate in a direction perpendicular to the direction of wave motion is known as:

A
transverse wave

B
propagated waves

C
longitudinal waves

D
stationary waves

Solution

The waves in which the particles of the medium vibrate in a direction perpendicular to the direction of wave motion is known as transverse wave. Examples of these waves are: vibrations in strings, ripples on water surface and electromagnetic waves.
Question 9
1 / -0

Which of the following voice is likely to have the lowest frequency?

A
Voice of a woman

B
Voice of a baby girl

C
Voice of a baby boy

D
Voice of a man

Solution

High frequency voices are high pitched and shrill whereas low frequency voices are low pitched. Generally, the voices of women and babies are high pitched and shrill whereas that of a man is low - pitched with low frequency.
Question 10
1 / -0

If the wavelength of a wave is x, the distance between the compression and the adjoining rarefaction is

A
x/2

B
x/4

C
x

D
2x

Solution

The distance between two consecutive compressions or rarefaction is the wavelength of the wave ($$x$$).
Thus, the distance between compression and the adjoining rarefaction is half the wavelength, i.e. $$\dfrac{x}{2}$$.

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Re-Attempt Weekly Quiz Competition

Sound Test - 49

Result

Sound Test - 49

Score

-

Rank

-

SHARING IS CARING

Question 1

X

Y

Z

W

Solution

Question 2

2000 Hz

3400 Hz

170 Hz

none

Solution

Question 3

$$100\ m$$

$$50\ m$$

$$200\ m$$

$$400\ m$$

Solution

Question 4

Cochlea

Malleus

Pinna

Ear drum

Solution

Question 5

the movement of the three ear ossicles

the movement of stirrup

the movement of fluid in the cochlea

all

Solution

Question 6

Compression

Rarefaction

Reflection

None

Solution

Question 7

Sound $$\rightarrow$$ ear $$\rightarrow$$ inner ear $$\rightarrow$$ vibration of eardrum $$\rightarrow$$ brain $$\rightarrow$$ hearing

Ear $$\rightarrow$$ vibration of eardrum $$\rightarrow$$ Inner ear $$\rightarrow$$ hearing $$\rightarrow$$ brain $$\rightarrow$$ vibration

Sound $$\rightarrow$$ ear $$\rightarrow$$ inner ear $$\rightarrow$$ vibration of eardrum $$\rightarrow$$ hearing $$\rightarrow$$ brain

Sound $$\rightarrow$$ ear $$\rightarrow$$ vibration of eardrum $$\rightarrow$$ inner ear $$\rightarrow$$ brain $$\rightarrow$$ hearing

Solution

Question 8

transverse wave

propagated waves

longitudinal waves

stationary waves

Solution

Question 9

Voice of a woman

Voice of a baby girl

Voice of a baby boy

Voice of a man

Solution

Question 10

x/2

x/4

x

2x

Solution

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