MCQ on Sound Class 8
Choose the correct answer.
Question 1.
Sound can’t travel in
A) solid
B) liquid
C) gas
D) vacuum
Answer:
D) vacuum
Question 2.
The unwanted sound in our surroundings leads to ________
A) conversation
B) emission
C) absorption
D) pollution
Answer:
D) pollution
Question 3.
The intensity of sound is measured in ________
A) Decibel
B) Meter
C) Kg
D) Newton
Answer:
A) Decibel
Question 4.
The numbers of vibrations per second is called
A) wave length
B) amplitude
C) frequency
D) none of these
Answer:
C) frequency
Question 5.
The shrillness of a sound is called
A) pitch
B) velocity
C) wave length
D) none
Answer:
A) pitch
Question 6.
An object which moves to and fro motion from rest known as ________
A) Linear motion
B) Vibration
C) Simple motion
D) Angular motion
Answer:
B) Vibration
Question 7.
The number of vibrations produced per second is known as
A) Frequency
B) Shrillness
C) Vibration limit
D) Decibels
Answer:
A) Frequency
Question 8.
Audible range is
A) 20 Hz-2000 Hz
B) 20 Hz-20,000 Hz
C) 200 Hz-20,000 Hz
D) 20 Hz-2,00,000 Hz
Answer:
B) 20 Hz-20,000 Hz
Question 9.
Pitch depends upon ________ of the sound.
A) frequency
B) amplitude
C) intensity
D) none of these
Answer:
A) frequency
Question 10.
Intensity of sound depends on
A) pitch
B) amplitude
C) frequency
D) none of these
Answer:
B) amplitude
Question 11.
________ produce more shrillness sound.
A) Man
B) Woman
C) Child
D) None of these
Answer:
C) Child
Question 12.
Length of vocal cords in man is nearly ________ mm.
A) 20
B) 10
C) 5
D) 1
Answer:
A) 20
Question 13.
Length of vocal cords in women is ________ mm.
A) 20
B) 15
C) 10
D) 5
Answer:
B) 15
Question 14.
The sounds which are pleasant to hear and are in order are called ________
A) music
B) noise
C) both
D) none of these
Answer:
A) music
Question 15.
Sounds which are irregular and unpleasant to hear are called ________
A) music
B) noise
C) both A and B
D) none of these
Answer:
B) noise
Question 16.
The sounds that normal human being can be listen are called ________ sounds.
A) infrasonics
B) ultrasonics
C) audible
D) none of these
Answer:
C) audible
Question 17.
The sound produced in our normal conversation is about ________ dB.
A) 0
B) 120
C) 60
D) 140
Answer:
C) 60
Question 18.
Choose correct option for sure matching.
| Group – A | Group – B |
| 1. Pitch | a) Pleasant to hear |
| 2. Intensity of sound | b) 20 to 20,000 Hz |
| 3. Music | c) Frequency |
| 4. Noise | d) Amplitude |
| 5. Audible frequency range | e) Unpleasant to hear |
A) 1 – a, 2 – b, 3 – c, 4 – d, 5 – e
B) 1 – b, 2 – c, 3 – d, 4 – e, 5 – a
C) 1 – c, 2 – d, 3 – a, 4 – e, 5 – b
D) 1 – d, 2 – e, 3 – a, 4 – b, 5 – c
Answer:
C) 1 – c, 2 – d, 3 – a, 4 – e, 5 – b
| Group – A | Group – B |
| 1. Pitch | c) Frequency |
| 2. Intensity of sound | d) Amplitude |
| 3. Music | a) Pleasant to hear |
| 4. Noise | e) Unpleasant to hear |
| 5. Audible frequency range | b) 20 to 20,000 Hz |
Question 19.
Jalatarang works with the difference in ________
A) air column
B) string length
C) area of membrane
D) none
Answer:
A) air column
Question 20.
Sound will produce, when a body
A) moves
B) falls
C) flies
D) vibrates
Answer:
D) vibrates
Question 21.
Vocal cords are present in
A) Larynx
B) Mouth
C) Nose
D) Stomach
Answer:
A) Larynx
Question 22.
Number of vocal cords present in our throat is ________
A) 1
B) 2
C) 3
D) 4
Answer:
B) 2
Question 23.
Sound can travel in
A) solids
B) liquids
C) gases
D) above all
Answer:
D) above all
Question 24.
Loudness and feebleness of sounds’ depends upon
A) frequency
B) pitch
C) amplitude
D) above all
Answer:
C) amplitude
Question 25.
Vibrate a bell and touch it. You may feel
A) heat
B) cool
C) vibration
D) shock
Answer:
C) vibration
Question 26.
Guess the object which produced sound without vibrate itself.
A) tuning fork
B) bell
C) air
D) no object
Answer:
D) no object
Question 27.
How do you produce a feeble sound?
A) By striking gently a body
B) By striking hardly a body
C) By increasing length of a body
D) By decreasing length of a body
Answer:
A) By striking gently a body
Question 28.
The loudness of sound exceeds ________ are harmful for the ear
A) 80 dB
B) 60 dB
C) 50 dB
D) 55 dB
Answer:
A) 80 dB
Question 29.
Choose correct option for sure matching.
| Group – A | Group – B |
| 1. Normal breathing | a) 30 dB |
| 2. Soft Whisper | b) 10 dB |
| 3. Normal conversation | c) 80 dB |
| 4. Busy traffic | d) 60 dB |
| 5. Average factory | e) 70 dB |
A) 1 – a, 2 – b, 3 – c, 4 – d, 5 – e
B) 1 – b, 2 – a, 3 – d, 4 – e, 5 – c
C) 1 – e, 2 – d, 3 – c, 4 – b, 5 – a
D) 1 – c, 2 – e, 3 – d, 4 – b, 5 – a
Answer:
B) 1 – b, 2 – a, 3 – d, 4 – e, 5 – c
| Group – A | Group – B |
| 1. Normal breathing | b) 10 dB |
| 2. Soft Whisper | a) 30 dB |
| 3. Normal conversation | d) 60 dB |
| 4. Busy traffic | e) 70 dB |
| 5. Average factory | c) 80 dB |
Question 30.
| Instrument | Vibrating part |
| A | Membrane, air inside hallow body |
| Flute | Air inside hollow body |
| Veena | Vibrating strings |
A may be
A) Tabla
B) Guitar
C) Harmonium
D) Shehnai
Answer:
A) Tabla
Question 31.
Sound travel much faster in ________
A) solids
B) liquids
C) gases
D) plasma
Answer:
A) solids
Question 32.
Flute is an instrument of ________ type
A) drum
B) woodwind
C) stringed
D) none of these
Answer:
B) woodwind
Question 33.
Guitar is an instrument of ________ type
A) drum
B) fringed
C) stringed
D) None of these
Answer:
C) stringed
Question 34.
High intensity sounds causes
A) anger
B) frustration
C) express negativity
D) above all
Answer:
D) above all
Question 35.
Raju cannot hear this sounds with
A) 10 Hz
B) 200 Hz
C) 20,000 Hz
D) Above all
Answer:
A) 10 Hz
Question 36.
How do you control sound pollution?
A) By plantation
B) By attaching silencers to the vehicles
C) Reducing sounds through loud speakers
D) Above all
Answer:
D) Above all
Question 37.
Match the following.
| A | B |
| 1. Tabla | a) Stringed instrument |
| 2. Flute | b) Membrane |
| 3. Veena | c) Air blowing |
Choose the correct answer.
A) 1 – c, 2 – b, 3 – a
B) 1 – c, 2 – a, 3 – b
C) 1 – b, 2 – a, 3 – c
D) 1 – b, 2 – c, 3 – a
Answer:
D) 1 – b, 2 – c, 3 – a
| A | B |
| 1. Tabla | b) Membrane |
| 2. Flute | c) Air blowing |
| 3. Veena | a) Stringed instrument |
Question 38.
Find the odd one out from the parts of speech organs.
A) Vocal cords
B) Lips
C) Tongue
D) Ear
Answer:
D) Ear
Question 39.
P : Units of intensity of sound is decible.
Q : The number of vibrations per minute is called frequency
A) P – True, Q – True
B) P – False, Q – True
C) P – True, Q – False
D) P – False, Q – False
Answer:
C) P – True, Q – False
Question 40.
A bird makes high pitch sound and a lion makes low pitch roar. Predict the reason
A) Bird produces high frequency sound
B) Lion produces high frequency sound
C) Bird size is small
D) Lion size is big
Answer:
A) Bird produces high frequency sound
Question 41.
A blade mdde 3000 vibrations in 10 seconds. Then the frequency of the blade is ________ vibr./sec.
A) 30
B) 300
C) 3000
D) 30000
Answer:
B) 300
Question 42.
P : Intensity of sound depends on amplitude.
Q : Pitch of the sound depends on frequency.
A) P, Q both are false
B) P is true, Q is false
C) P is false, Q is true
D) P, Q both are true
Answer:
D) P, Q both are true
Question 43.
Frequency is related to ________
A) Loudness
B) Pitch
C) Amplitude
D) Feebleness
Answer:
B) Pitch
Question 44.
The following is not the effect of sound pollution
A) Loss of hearing
B) Sleeplessness
C) Hypertension
D) Loss of eye sight
Answer:
D) Loss of eye sight
Question 45.
The velocity of propagation of sound in ascending order is ________
A) Solid < Liquid < Air
B) Air < Liquid < Solid
C) Liquid < Air < Solid
D) Solid < Air < Liquid
Answer:
B) Air < Liquid < Solid
Question 46.
Which of the following statements are correct ?
i) Sound is produced by vibrations
ii) Sound requires a medium for propagation
iii) Light and sound both require a medium for propagation.
iv) Sound travels slower than light
A) (i) and (ii)
B) (i), (ii) and (iii)
C) (ii), (iii) and (iv)
D) (i), (ii) and (iv)
Answer:
D) (i), (ii) and (iv)
Question 47.
An object is. vibrating at 50 Hz. What is its time period ?
A) 0.02 S
B) 2 S
C) 0.2 S
D) 20 S
Answer:
A) 0.02 S
Question 48.
Ultrasound has frequency of vibration
A) between 20 to 20,000 Hz
B) below 20 Hz
C) above 20,000 Hz
D) between 500 and 10,000 Hz
Answer:
C) above 20,000 Hz
Question 49.
In order to reduce the loudness of a sound we have to,
A) Decrease its frequency of vibrations of the sound
B) Increase its frequency of vibrations of the sound
C) Decrease its amplitude of vibrations of the sound
D) Increase its amplitude of vibrations of the sound
Answer:
C) Decrease its amplitude of vibrations of the sound
Question 50.
This is inaudible to the humans
A) 200 Hz
B) 2000 Hz
C) 2Hz
D) 20000 Hz
Answer:
C) 2Hz
Question 51.
Dogs can hear thepounds of
A) <2 Hz
B) = 20000 Hz
C) <20000 Hz D) >20000 Hz
Answer:
D) >20000 Hz
Question 52.
Unpleasant sounds are called
A) noise
B) music
G) song
D) beat
Answer:
A) noise
Question 53.
Musical sound is pleasing to the ear.
A) noise
B) music
C) thunder
D) traffic
Answer:
B) music
Question 54.
Presence of unwanted gases and particles in the air is called
A) noise pollution
B) water pollution
C) air pollution
D) all
Answer:
C) air pollution
Question 55.
Presence of excessive or unwanted sounds in the environment is called
A) noise pollution
B) water pollution
C) air pollution
D) all
Answer:
A) noise pollution
Question 56.
The Harm of Noise Pollution is
A) lack of sleep
B) hypertension
C) anxiety
D) all
Answer:
D) all
Question 57.
A person who is exposed to a loud sound continuously may get ……………… impairment of hearing.
A) temporary
B) permanent
C) A or B
D) none
Answer:
C) A or B
Question 58.
To minimise noise pollution ………………. should be fix to the vehicles.
A) horns
B) brakes
C) silencers
D) all
Answer:
C) silencers
Question 59.
The given figures shows
A) sound travels in solids
B) sound travels in liquids
C) sound travels in vacuum
D) above all
Answer:
A) sound travels in solids
Question 60.
In the given waves, which one has more frequency ?
Answer:
A
Question 61.
Identify the name of the activity in the figure the girl was doing.
A) Blowing air
B) Jalatarang
C) Striking the glass
D) None
Answer:
B) Jalatarang
Question 62.
1) Units of intensity of sound is decible.
2) The number of vibrations per minute is called frequency.
A) 1-True, 2-True
B) 1-False, 2-True
C) 1-True, 2-False
D) 1-False, 2-False
Answer:
C) 1-True, 2-False
Question 63.
A blade made 3000 vibrations in 10 seconds. Then the frequency of the blade is ……………. vibr. / sec.
A) 30
B) 300
C) 3000
D) 30000
Answer:
B) 300
Question 64.
P : Intensity of sound depends on amplitude
Q : Pitch of the sound depends on Frequency
A) P, Q both are false
B) P is true, Q is false
C) P is false, Q is true
D) P, Q both are true
Answer:
D) P, Q both are true
Question 65.
Velocity of sound in vacuum
A) 0 meter/sec
B) 100 meter/sec
C) 250 meter/sec
D) 330 meter/sec
Answer:
A) 0 meter/sec
Question 66.
Velocity of the sound is maximum in
A) Solids
B) Liquids
C) Gases
D) Vacuum
Answer:
A) Solids
Question 67.
Length of vocal chords in men is 20mm, in womqn it is about 5 mm less and in children it is shorten than that. Length of the vocal chord determines the frequency and in turn determines the pitch.
The sound produced by a short vibrating blade has high pitch and by a long vibrating blade has a low pitch, Which of the following can be said based on the above ?
A) Women’s voice have a higher pitch than men.
B) Children’s voice have a higher pitch than women.
C) Men’s voice have a higher pitch than women and children.
D) The voice of men and children have the same pitch.
Answer:
B) Children’s voice have a higher pitch than women.
Question 68.
Decibel is the unit for measuring in-tensity of sound. It is expressed in Decibels (dB). Some common sounds and their decibel ratings. Near total silence – 0 dB, A whisper – 15 dB, Normal conversation – 60 dB, A lawnmower – 90 dB, A car horn – 110 dB, A jet engine – 120 dB. A gunshot or firecracker – 140 dB, If a person is being exposed to the sound of 80 dB continuously it may lead to hearing problems.
Which of the following can be said based on the above ?
A) Listening to whispering sounds continuously can lead to hearing problems.
B) Hearing to continuous explosive sounds of guns can lead to hearing problems.
C) Toted silence can harm the ears and some sound is required for maintaining the health of ear drums.
D) Car horns and other vehicle horn sounds do not cause any damage to the ears.
Answer:
B) Hearing to continuous explosive sounds of guns can lead to hearing problems.
Question 69.
Select the correct option to fill in the blanks.
The sound produced by the siren of an ambulance would have _________ and _______ .
A) low amplitude, high frequency
B) high amplitude, low frequency
C) low amplitude, low frequency
D) high amplitude, high frequency
Answer:
D) high amplitude, high frequency
Question 70.
If a person beats a drum on the Earth and an astronaut beats an identical drum in space, what will be the DIFFERENCES in the effects ?
A) No vibrations and sound will be produced in space.
B) The drum in space will vibrate too, but no sound will be observed.
C) The drum on the Earth will vibrate for a longer time than the one in spate.
D) There will be no difference in terms of the vibrations or sound.
Answer:
B) The drum in space will vibrate too, but no sound will be observed.
Question 71.
An electric guitar generates a sound of constant frequency. An increase in which characteristic of sound wave would result in an increase in loudness ?
A) speed
B) wavelength
B) period
D) amplitude
Answer:
D) amplitude
Question 72.
If a person beats a drum on the Earth, and an astronaut beats an identical drum in space with the same force, what will be the DIFFERENCE in the effects?
A) No vibrations and sound will be produced in space.
B) The durm in space will vibrate too, but no sound will be produced.
C) The drum on the Earth will vibrate for a longer time than the one in space.
D) There will be no difference in terms of the vibrations or sound.
Answer:
B) The durm in space will vibrate too, but no sound will be produced.
Fill in the blanks.
1. Sound is produced by ………………….. Objects.
Answer:
vibrating
2. In human beings, the vibration of the ………………….. produces sound.
Answer:
vocal cords
3. Sound travels through ………………….. .
Answer:
a medium
4. ………………….. cannot travel in vacuum.
Answer:
Sound
5. The ………………….. senses the vibrations of sound, it sends the signals to …………………..
Answer:
eardrum, the brain
6. The number of oscillations or vibrations per ………………….. is called the frequency of oscillation.
Answer:
Second
7. The ………………….. is expressed in hertz (Hz).
Answer:
frequency
8. The larger the ………………….. of vibration, the louder is the sound.
Answer:
amplitude
9. The higher the ………………….. of vibration, the higher the pitch and the shriller the sound.
Answer:
frequency
10. ………………….. sounds are called noise.
Answer:
Unpleasant
11. Excessive or unwanted sounds lead to ………………… .
Answer:
noise pollution
12. Noise pollution may pose ………………….. human beings.
Answer:
health problems
13. Attempts should be made to ………………….. noise pollution.
Answer:
minimise
14. ………………….. on the roadside and elsewhere can reduce noise pollution.
Answer:
Plantation
15. The loudness of sound depends on its ………………….. .
Answer:
amplitude
16. ………………….. attached to the vocal cords can make the cords tight or loose.
Answer:
Muscles
17. Sound needs ………………….. to travel.
Answer:
a medium
18. The sound cannot travel through ………………….. .
Answer:
a vacuum
19. Sound propagates in ………………….. direction/s in a medium.
Answer:
all
20. The ………………….. eardrum can impair hearing.
Answer:
damaged
21. The number of oscillations per second is called the ………………. of oscillation.
Answer:
frequency
22. A frequency of 1 Hz is ………………… oscillation per second.
Answer:
one
23. When the amplitude of vibration is large, the sound produced is …………………. .
Answer:
loud
24. A bird makes a …………………. pitched sound whereas a lion makes a pitched roar.
Answer:
high, low
25. Usually the voice of a woman has …………………. frequency than that of a man.
Answer:
higher
26. The ultrasound equipment, works at frequencies higher than …………………. .
Answer:
20,000 Hz
27. Sound produced by a harmonium is …………………. sound.
Answer:
a musical
Match the following.
Question 1.
| Group – A | Group – B |
| i) Stretched string | a) sitar |
| ii) Stretched membrane | b) manjira |
| c) mridangam |
Answer:
i – a, ii – c
| Group – A | Group – B |
| i) Stretched string | a) sitar |
| ii) Stretched membrane | c) mridangam |
Question 2.
| Group – A | Group – B |
| i) Loudness | a) time period |
| ii) Pitch | b) frequency |
| c) amplitude |
Answer:
i – c, ii – b
| Group – A | Group – B |
| i) Loudness | c) amplitude |
| ii) Pitch | b) frequency |
Question 3.
| Group – A | Group – B |
| i) Music | a) harmonium |
| ii) Noise | b) traffic |
| c) breeze |
Answer:
i – a, ii – b
| Group – A | Group – B |
| i) Music | a) harmonium |
| ii) Noise | b) traffic |
Question 4.
| Group – A | Group – B |
| i) Normal conversation | a) 30 dB |
| ii) Factory sound | b) 60 dB |
| c) 80 dB |
Answer:
i – b, ii – c
| Group – A | Group – B |
| i) Normal conversation | b) 60 dB |
| ii) Factory sound | c) 80 dB |
Question 5.
| Group – A | Group – B |
| i) Loudness | a) Hz |
| ii) Frequency | b) °C |
| c) dB |
Answer:
i – c, ii – a
| Group – A | Group – B |
| i) Loudness | c) dB |
| ii) Frequency | a) Hz |
Question 6.
| Group – A | Group – B |
| i) Audible frequency range | a) More than 20 KHz |
| ii) Normal breathing | b) 20 Hz to 20 KHz |
| iii) Ultrasonic waves | c) 10 dB |
| iv) Length of Vocal cords in man | d) Frequency |
| v) Number oscillators per second | e) 20 mm long |
Answer:
i – b, ii – c, iii – a, iv – e, v – d
| Group – A | Group – B |
| i) Audible frequency range | b) 20 Hz to 20 KHz |
| ii) Normal breathing | c) 10 dB |
| iii) Ultrasonic waves | a) More than 20 KHz |
| iv) Length of Vocal cords in man | e) 20 mm long |
| v) Number oscillators per second | d) Frequency |
Question 7.
| Group – A | Group – B |
| i) Unit of frequency | a) Low shrillness |
| ii) Pleasant sound | b) Noise |
| iii) Low frequency | c) Hertz |
| iv) Sound | d) Music |
| v) Unwanted sounds | e) Vibration of body |
Answer:
i – c, ii – d, iii – a, iv – e, v – b
| Group – A | Group – B |
| i) Unit of frequency | c) Hertz |
| ii) Pleasant sound | d) Music |
| iii) Low frequency | a) Low shrillness |
| iv) Sound | e) Vibration of body |
| v) Unwanted sounds | b) Noise |