Sound Test

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Sound Test - 23

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Weekly Quiz Competition

Question 1
1 / -0

When the amplitude is small, the sound produced is ............

A
Loud

B
Moderate

C
Faint

D
Shrill

Solution

Amplitude is the magnitude of the sound produced. Therefore, if the magnitude of amplitude is small then the sound produced is faint, or if the amplitude is high then the sound produced is loud.
Question 2
1 / -0

When sound travels through air, the air particles:

A
vibrate along direction of wave propagation

B
vibrate but not in any fixed direction

C
vibrate perpendicular to direction of wave propagation

D
do not vibrate

Solution

Air have bulk property so it only transfers longitudinal wave. A sound wave in air propagates as a longitudinal wave, in the form of compression and rarefaction so medium particles vibrate in the direction of wave propagation.

Hence Option A
Question 3
1 / -0

Amplitude of wave is:

A
the distance wave moves in one second

B
distance wave moves in one time period of wave

C
maximum distance moved by medium particles on either side of mean position

D
distance equal to 1 wavelength

Solution

Amplitude is the maximum distance moved by medium particles on either side of mean position.
Question 4
1 / -0

Fill in the blank.
In longitudinal waves, the particles vibrate in _______ direction of propagation.

A
parallel

B
perpendicular

C
$$45^0$$ inclined

D
$$60^0$$ inclined

Solution

Particle of medium in longitudinal waves vibrate in parallel direction of propagation.
Question 5
1 / -0

Why do we not hear the screams of a bat

A
screams are below 30,000Hz

B
the screams are infrasonic

C
the screams are ultrasonic

D
all

Solution

This is because the screams are ultrasonic (above 20,000 hertz) which the human ear cannot hear as humans can only hear the sound in the range of $$20Hz-20,000Hz$$.
Question 6
1 / -0

Which of the following waves do not require any kind of medium to propagate?

A
Sound Waves

B
Earthquake Waves

C
Light Waves

D
Water surface waves

Solution

Light waves, being electromagnetic waves, do not require any kind of medium to propagate.
Question 7
1 / -0

Which of the following frequency of sound can be heard by a dog but not by a man?

A
$$50,000 \ hertz$$

B
$$15,000 \ hertz$$

C
$$42,000 \ hertz$$

D
None

Solution

A sound of frequency $$42,000 \ hertz$$ can be heard by a dog but not by a man.
The waves having frequency between $$20 \ Hz-20,000 \ Hz$$ are audible to human beings. For dogs, the audible frequency range is $$67 \ hertz - 45,000 \ hertz$$
Question 8
1 / -0

The frequency of a wave traveling at a speed of $$500 m/s$$ is $$25 Hz$$. Its time period will be :

A
$$20 s$$

B
$$0.05 s$$

C
$$25 s$$

D
$$0.04 s$$

Solution

Given,
Speed of wave $$v=500\ m/s$$
frequency of a wave $$f=25\ Hz$$
Time period is the reciprocal of the frequency, and is given by,
$$T=\dfrac{1}{f}=\dfrac{1}{25}=0.04s$$
Question 9
1 / -0

What is known as strength of ear's perception of sound?

A
Loudness

B
Intensity

C
Frequency

D
Amplitude

Solution

Loudness is the strength of ear's perception of sound.
Question 10
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

The ultrasound waves can penetrate into matter to a large extent because they have very high frequency. They have frequency greater than 20,000 Hz.

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Re-Attempt Weekly Quiz Competition

Sound Test - 23

Result

Sound Test - 23

Score

-

Rank

-

SHARING IS CARING

Question 1

Loud

Moderate

Faint

Shrill

Solution

Question 2

vibrate along direction of wave propagation

vibrate but not in any fixed direction

vibrate perpendicular to direction of wave propagation

do not vibrate

Solution

Question 3

the distance wave moves in one second

distance wave moves in one time period of wave

maximum distance moved by medium particles on either side of mean position

distance equal to 1 wavelength

Solution

Question 4

parallel

perpendicular

$$45^0$$ inclined

$$60^0$$ inclined

Solution

Question 5

screams are below 30,000Hz

the screams are infrasonic

the screams are ultrasonic

all

Solution

Question 6

Sound Waves

Earthquake Waves

Light Waves

Water surface waves

Solution

Question 7

$$50,000 \ hertz$$

$$15,000 \ hertz$$

$$42,000 \ hertz$$

None

Solution

Question 8

$$20 s$$

$$0.05 s$$

$$25 s$$

$$0.04 s$$

Solution

Question 9

Loudness

Intensity

Frequency

Amplitude

Solution

Question 10

very high speed

very high frequency

very high wavelength

very high amplitude

Solution

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