Multiple Choice Questions

SOUND

Updated for CBSE 2027
71+ Practice Questions
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Practice Questions with Answers

Total 71 questions available

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Q. 1
What happens to the loudness of a sound as it moves away from its source?
A
Becomes constant
B
Remains the same
C
Increases
D
Decreases
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Q. 2
Which type of wave is a sound wave?
A
Electromagnetic wave
B
Standing wave
C
Longitudinal wave
D
Transverse wave
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Q. 3
How can ultrasounds detect flaws in metal?
A
By bending around corners
B
By producing sound
C
By reflecting off defects
D
By passing through without reflection
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Q. 4
Which wave property determines loudness?
A
Pitch
B
Frequency
C
Amplitude
D
All of these
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Q. 5
The crest and trough are parts of ____ wave.
A
Longitudinal wave
B
Transverse wave
C
both Longitudinal wave and Transverse wave
D
None of these
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Q. 6
What is the audible range of sound for humans?
A
20 Hz to 20,000 Hz
B
25 Hz to 25,000 Hz
C
15 Hz to 18,000 Hz
D
10 Hz to 15,000 Hz
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Q. 7
What medical technique uses ultrasound to form images of the heart?
A
X-ray
B
Echocardiography
C
CT scan
D
MRI
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Q. 8
Which animal is known to produce ultrasonic sounds to evade predators?
A
Rhinoceroses
B
Dolphins
C
Bats
D
Elephants
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Q. 9
What distinguishes a tone from a note?
A
Amplitude
B
Duration
C
Quality of sound
D
Frequency
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Q. 10
Children can hear sound of frequency up to:
A
25,000Hz
B
30,000Hz
C
20Hz
D
20,000Hz
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Q. 11
What is a wavelength?
A
Time period of the wave
B
Amplitude of the wave
C
Distance between compressions
D
Frequency of the sound
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Q. 12
How does the sensitivity of hearing change with age?
A
Increases for all frequencies
B
Decreases for lower frequencies
C
Decreases for higher frequencies
D
Remains constant
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Q. 13
Principle of reflection of sound is used in:
A
Stethoscope
B
Megaphone
C
Sound boards
D
All of these
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Q. 14
How do sound waves travel through a medium?
A
By light transmission
B
By particle movement
C
Through electromagnetic waves
D
By compression only
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Q. 15
Sound is produced when
A
An object falls
B
An object vibrates
C
An object is stationary
D
An object is on ground
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Q. 16
A bat hears the echo of its squeak after 0.1 seconds. How far is the obstacle? Speed of sound is 344 m/s.
A
170m
B
17.2m
C
18m
D
180m
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Q. 17
What type of wave is created when you drop a pebble into a pond?
A
Transverse wave
B
Sound wave
C
Shock wave
D
Longitudinal wave
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Q. 18
What is an echo?
A
A reflected sound
B
A sound that fades away
C
A type of noise
D
A continuous sound
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Q. 19
How does sound propagation occur in air?
A
By light reflection
B
By electromagnetic waves
C
By density variations
D
By particle movement only
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Q. 20
The method of detecting the presence, position and direction of motion of distant objects by reflecting a beam of sound waves is known as _____.
A
SONAR
B
MIR
C
CRO
D
RADAR
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Q. 21
What is the relationship between frequency and time period?
A
They are equal
B
No relationship
C
They are inversely related
D
They are directly related
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Q. 22
Choose the correctly matched pair:
A
Compression - Region of high pressure
B
Sound waves - Transverse waves
C
Rarefaction - Region of high pressure
D
Medium for sound - Vacuum
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Q. 23
How can reverberation be reduced in an auditorium?
A
By using concrete walls
B
By using sound-absorbent materials
C
By increasing audience size
D
By painting walls
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Q. 24
How far must a reflecting surface be to hear a distinct echo if sound travels at 344 m/s?
A
34.4 m
B
20 m
C
10 m
D
17.2 m
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Q. 25
What is the intensity of sound?
A
Amplitude of the wave
B
Pitch of the sound
C
Energy passing through area
D
Frequency of the sound
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Q. 26
Which animals are known to use infrasound for communication?
A
Elephants and whales
B
Birds and bats
C
Mice and rabbits
D
Cats and dogs
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Q. 27
You cannot talk to each other on the moon because
A
you would not feel like talking
B
gravity is 1/6th that on the earth
C
compressions and rarefactions can only travel on earth’s surface
D
atmosphere is not present
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Q. 28
A wave moves a distance of 10m in 0.05 seconds. Find the wavelength if frequency is 200Hz.
A
0.8m
B
1m
C
0./m
D
0.5m
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Q. 29
An echo is heard when:
A
Minimum time gap is 1/10 sec
B
Minimum distance is 18m
C
Minimum distance is 17m
D
Minimum time gap is 1/100 sec
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Q. 30
What is infrasonic sound?
A
Sound of any frequency
B
Sound below 20 Hz
C
Sound between 20 Hz and 20 kHz
D
Sound above 20 kHz
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Q. 31
The upper frequency limit of the audible range of human hearing is about
A
2 kHz
B
2,000,000 Hz
C
2000 Hz
D
20 kHz
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Q. 32
How does the rolling of thunder occur?
A
Single reflection
B
Continuous echoes
C
High-frequency sound
D
Low-frequency sound
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Q. 33
What is the main cause of sound production?
A
Air pressure
B
Light waves
C
Vibration of objects
D
Temperature changes
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Q. 34
Sound waves in air are
A
polarised
B
transverse
C
longitudinal
D
electromagnetic
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Q. 35
Which of the following is a mechanical wave?
A
Radio waves
B
Sound
C
X-rays
D
Light
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Q. 36
What is a characteristic of mechanical waves?
A
They require a medium
B
They have no frequency
C
They travel through vacuum
D
They are light waves
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Q. 37
Absorbent materials are to be used while making interior design in an auditorium as
A
To prevent reverberation
B
it has to look good
C
sound travels with a lesser velocity
D
echo is to be increased
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Q. 38
What is the SI unit of frequency?
A
Hertz (Hz)
B
Newton (N)
C
Metre (m)
D
Second (s)
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Q. 39
What does the frequency of a sound wave indicate?
A
The speed of sound
B
The distance between waves
C
The amplitude of the wave
D
The pitch of the sound
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Q. 40
Infrasonic waves have frequencies
A
above 20,000 Hz
B
below 20 Hz
C
no upper or lower limit of frequencies
D
between 20 Hz and 20,000 Hz
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Q. 41
Sound cannot travel through
A
water
B
space
C
air
D
iron
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Q. 42
How is rarefaction defined in sound waves?
A
High pressure region
B
Low pressure region
C
High density region
D
Static region
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Q. 43
What device uses multiple reflections to amplify sound?
A
Headphones
B
Stethoscope
C
Loudspeaker
D
Microphone
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Q. 44
Sound is produced by _________objects.
A
vibrating
B
stationary
C
fast moving
D
rotating
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Q. 45
In longitudinal waves, how does the particle of medium vibrate compared to the direction of propagation of wave?
A
Perpendicular
B
Parallel
C
At 45°
D
At 60°
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Q. 46
The eardrum is a:
A
Fluid
B
Bone
C
A stretched membrane
D
Coiled tube
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Q. 47
A source produces 20 crests and 20 troughs in 0.2 seconds. Find the frequency.
A
1Hz
B
200Hz
C
100Hz
D
150Hz
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Q. 48
What is a medium in the context of sound?
A
Substance for sound travel
B
A wave
C
A vibrating object
D
A sound wave
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Q. 49
What is the speed of sound in air at 22°C?
A
344 m/s
B
331 m/s
C
300 m/s
D
350 m/s
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Q. 50
What is necessary for sound to be reflected?
A
A solid or liquid surface
B
A vacuum
C
High temperature
D
A liquid medium
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Q. 51
The motion of the particles of a medium when a sound wave is passing through it is:
A
translatory
B
rotatory
C
oscillatory
D
random
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Q. 52
What happens to the particles of the medium as sound travels?
A
They oscillate around fixed positions
B
They break down
C
They disappear
D
They move long distances
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Q. 53
Sound wave is a ____ wave.
A
transverse wave
B
longitudinal wave
C
both a and b
D
None of these
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Q. 54
Sound waves are characterized by the motion of particles in the medium and are called __________ waves.
A
Transverse
B
Mechanical
C
Electromagnetic
D
Longitudinal
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Q. 55
How does the speed of sound change with temperature?
A
Decreases with increase
B
Changes randomly
C
Remains constant
D
Increases with increase
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Q. 56
How does loudness relate to amplitude?
A
Inversely proportional
B
Independent
C
Directly proportional
D
No relation
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Q. 57
How is the amplitude of a sound wave defined?
A
Time period of the wave
B
Maximum disturbance from mean
C
Speed of the wave
D
Frequency of the wave
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Q. 58
What is a primary use of an ultrasound scanner?
A
To measure blood pressure
B
To image internal organs
C
To detect external injuries
D
To assess bone density
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Q. 59
The speed of sound is defined as the distance which a point on a wave, such as a compression or a rarefaction, travels per unit _____.
A
Time
B
Amplitude
C
Frequency
D
Intensity
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Q. 60
Which of the following will not allow sound propagation?
A
Steel
B
Vacuum
C
Water
D
Air
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Q. 61
Which characteristic of sound is associated with the speed of vibration?
A
Amplitude
B
Quality
C
Frequency
D
Pitch
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Q. 62
Which of the following quantities is transferred during wave propagation?
A
Energy
B
Particles
C
Speed
D
Mass
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Q. 63
The maximum displacement of the particle from its mean position is called the:
A
Amplitude
B
Wavelength
C
Wave number
D
None of these
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Q. 64
What property of a sound wave enables us to distinguish one sound from another having the same pitch and loudness?
A
Frequency
B
Intensity
C
Amplitude
D
Quality
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Q. 65
What are compressions in sound waves?
A
Regions of still air
B
Regions of low pressure
C
Static regions
D
Regions of high pressure
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Q. 66
Cochlea, semicircular canals, and auditory nerve are associated with:
A
Middle ear
B
Inner ear
C
External ear
D
None of these
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Q. 67
The upper limit of frequency of sound waves audible to human beings is:
A
20,000Hz
B
5Hz
C
20Hz
D
35,000Hz
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Q. 68
Frequency of infrasonic waves is ____________ than the frequency of ultrasound waves.
A
less
B
more
C
almost the same
D
none of these
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Q. 69
What is reverberation?
A
A loud sound
B
Echo of sound
C
Persistence of sound
D
Sound absorption
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Q. 70
The distance between a consecutive crest and trough is:
A
4x
B
2x
C
x/2
D
x
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Q. 71
Which of the following instruments directs sound in a particular direction?
A
Violin
B
Piano
C
Flute
D
Megaphone
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