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Science M.C.Q. [I MARKS]

Sound · Gujarat Board (GSEB) STD 8 (GSEB - English Medium). 30 questions.

Questions

M.C.Q. [I MARKS]

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30 questions · auto-graded multiple-choice test.

MCQ 11 Mark
The maximum displacement of a vibrating body from its mean position is called
  • A
    frequency
  • B
    time period
  • ✓
    amplitude
  • D
    None of the above
Answer
Correct option: C.
amplitude
C
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MCQ 21 Mark
Ultrasound has frequency of vibration
  • A
    between 20 and 20000 Hz
  • B
    below 20 Hz
  • ✓
    above 20000 Hz
  • D
    between 500 and 10000 Hz
Answer
Correct option: C.
above 20000 Hz
C
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MCQ 31 Mark
Loudness of sound is measured in units of
  • ✓
    decibel (dB)
  • B
    hertz (Hz)
  • C
    metre (m)
  • D
    metre/second(m/s)
Answer
Correct option: A.
decibel (dB)
A
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MCQ 41 Mark
A list of mediums is given below
(i) Wood
(ii) Water
(iii) Air
(iv) Vacuum
In which of these mediums can sound travel?
  • A
    (i) and (ii)
  • ✓
    (i), (ii) and (iii)
  • C
    (iii) and (iv)
  • D
    (ii), (iii) and (iv)
Answer
Correct option: B.
(i), (ii) and (iii)
B
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MCQ 51 Mark
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)
  • ✓
    (i), (ii) and (iv)
Answer
Correct option: D.
(i), (ii) and (iv)
D
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MCQ 61 Mark
1 Hz is equal to
  • A
    1 vibration per minute
  • B
    10 vibrations per minute
  • ✓
    60 vibrations per minute
  • D
    600 vibrations per minute
Answer
Correct option: C.
60 vibrations per minute
C
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MCQ 81 Mark
An object is vibrating at 5 Hz. What is its time period?
  • ✓
    0.02 s
  • B
    0.2 s
  • C
    2 s
  • D
    20.0 s
Answer
Correct option: A.
0.02 s
A
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MCQ 91 Mark
Which of the following sounds can be classified as noise for humans?
  • A
    Sounds that are softer than 20 dB
  • B
    Sounds that are in between 20 dB and 40 dB
  • C
    Sounds that are between 40 dB and 80 dB
  • ✓
    Sounds that are louder than 80 dB
Answer
Correct option: D.
Sounds that are louder than 80 dB
D
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MCQ 101 Mark
In order to reduce the loudness of a sound, we have to
  • A
    decrease its frequency of vibration of the sound
  • B
    increase its frequency of vibration of the sound
  • ✓
    decrease its amplitude of vibration of the sound
  • D
    increase its amplitude of vibration of the sound
Answer
Correct option: C.
decrease its amplitude of vibration of the sound
C
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MCQ 111 Mark
Assertion (A) The sound of woman is shriller than man.
Reason (R) The pitch of the sound depends on the frequency of sound.
  • A
    Both A and R are true and R is the correct explanation of A
  • ✓
    Both A and R are true but R is not the correct explanation of A
  • C
    A is true but R is false.
  • D
    A is false but R is true.
Answer
Correct option: B.
Both A and R are true but R is not the correct explanation of A
B
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MCQ 121 Mark
Assertion (A) Sound travels slower through gases than liquid.
Reason (R) The molecules in gases are farther apart from each other.
  • ✓
    Both A and R are true and R is the correct explanation of A
  • B
    Both A and R are true but R is not the correct explanation of A
  • C
    A is true but R is false.
  • D
    A is false but R is true.
Answer
Correct option: A.
Both A and R are true and R is the correct explanation of A
A
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MCQ 131 Mark
The human brain can sense sound frequencies
  • A
    less than 20 Hz
  • ✓
    between 20 Hz and 20000 Hz
  • C
    more than 20000 Hz
  • D
    All of the above
Answer
Correct option: B.
between 20 Hz and 20000 Hz
B
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MCQ 141 Mark
Loudness of sound depends upon its
  • A
    frequency
  • B
    pitch
  • ✓
    amplitude
  • D
    shirillness
Answer
Correct option: C.
amplitude
C
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MCQ 151 Mark
Sound can be produced by
  • A
    applying on object
  • ✓
    vibration of objects
  • C
    passing electric current through an object.
  • D
    effect of magnet on an object
Answer
Correct option: B.
vibration of objects
B
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MCQ 161 Mark
Assertion (A) Human beings cannot hear sound less than 20 Hz.
Reason (R) Audible range of human is 20 Hz to 20 kHz.
  • ✓
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true but R is not the correct explanation of A
  • C
    A is true but R is false.
  • D
    A is false but R is true.
Answer
Correct option: A.
Both A and R are true and R is the correct explanation of A.
(A) Both A and R are true and R is the correct explanation of A.
The audible range of sound for human being is indeed from 20 Hz and 20 kHz. So, both A and R are correct and R is the correct explanation.
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MCQ 171 Mark
Assertion (A) Frequency is measured in hertz (Hz).
Reason (R) Lower the frequency, higher is the pitch of the sound.
  • A
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true but R is not the correct explanation of A
  • ✓
    A is true but R is false.
  • D
    A is false but R is true.
Answer
Correct option: C.
A is true but R is false.
(C) A is true but R is false.
R is false because for higher frequency pitch of the sound is higher.
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MCQ 181 Mark
Assertion (A) Tabla, sitar, flute and harmonium are musical instruments.
Reason (R) Sound is produced by vibrations in musical instruments.
  • ✓
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true but R is not the correct explanation of A
  • C
    A is true but R is false.
  • D
    A is false but R is true.
Answer
Correct option: A.
Both A and R are true and R is the correct explanation of A.
(A) Both A and R are true and R is the correct explanation of A.
Both A and R are correct because without vibration, sound cannot be produced.
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MCQ 191 Mark
Assertion (A) Astronauts in space can hear each other.
Reason (R) Loud sound have high amplitude.
  • A
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true but R is not the correct explanation of A
  • C
    A is true but R is false.
  • ✓
    A is false but R is true.
Answer
Correct option: D.
A is false but R is true.
(D) A is false but R is true.
A is false because sound needs medium to travel but there is no medium in space. R is correct.
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MCQ 201 Mark
Which of the following are used to study the growth of foetus inside the mother's womb?
  • A
    Radiowaves
  • B
    X-rays
  • C
    Infrared waves
  • ✓
    Sound waves
Answer
Correct option: D.
Sound waves
D
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MCQ 211 Mark
The loudness of sound is determined by its
  • ✓
    amplitude of vibration
  • B
    ratio of amplitude and frequency of vibration
  • C
    frequency of vibration
  • D
    product of amplitude and frequency of vibration
Answer
Correct option: A.
amplitude of vibration
A
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MCQ 221 Mark
A person works in a factory where a lot of industrial machines run daily. What harmful effects he is likely to suffer from?
  • A
    Fever
  • B
    Cataract
  • C
    Lack of vision
  • ✓
    Lack of hearing
Answer
Correct option: D.
Lack of hearing
D
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MCQ 231 Mark
The ultrasound waves can penetrate into matter to a large extent because they have
  • ✓
    very high frequency
  • B
    very high speed
  • C
    very high quality
  • D
    very high amplitude
Answer
Correct option: A.
very high frequency
A
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MCQ 241 Mark
The loudness of sound depends on its
  • ✓
    amplitude
  • B
    time period
  • C
    frequency
  • D
    speed
Answer
Correct option: A.
amplitude
A
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MCQ 251 Mark
What is the structure of the eardrum?
  • A
    It is the stretched cord in the ear
  • ✓
    It is the stretched membrane in the ear
  • C
    It is the nerve which transmits a signal to the brain
  • D
    It is the funnel type canal of the ear through which sound enters
Answer
Correct option: B.
It is the stretched membrane in the ear
B
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MCQ 261 Mark
Which option explains how sound is produced by the voice box in a human throat?
  • A
    The voice box vibrates by the air coming out from lungs
  • B
    The vocal cords vibrate by the air coming in through the voice box
  • ✓
    The vocal cords stretched across the voice box vibrates by air coming from lungs
  • D
    The stretched vocal cords across the voice box produce the air to vibrate the voice box
Answer
Correct option: C.
The vocal cords stretched across the voice box vibrates by air coming from lungs
C
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MCQ 281 Mark
What is an example of an object that works on vibrations?
  • A
    A spinning top
  • B
    A coin is tossed
  • C
    Marble rolling on a ramp
  • ✓
    Guitar string being plucked
Answer
Correct option: D.
Guitar string being plucked
D
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MCQ 291 Mark
Voice of which of the following is likely to have minimum frequency?
  • A
    Baby girl
  • B
    Baby boy
  • ✓
    A man
  • D
    A woman
Answer
Correct option: C.
A man
(C) A man
Voice of a man is likely to have minimum frequency.
The frequency determines the pitch of a sound. If the frequency of vibration is higher, the sound is shrill and has a higher pitch. If the frequency of vibration is lower, the sound has a lower pitch.
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MCQ 301 Mark
Sound can travel through
  • A
    gases only
  • B
    solids only
  • C
    liquids only
  • ✓
    solids, liquids and gases
Answer
Correct option: D.
solids, liquids and gases
(D) solids, liquids and gases
Sound can travel through solids, liquids and gases but it cannot travel in vacuum.
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