Class 8 Sound CBSE Questions & Answers

Class 8 · Sound

This is Science Class 8 Sound CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Which of the following health problem is not caused due to noise pollution?
  • A
    Lack of sleep
  • B
    Hypertension
  • C
    Anxiety
  • D
    Diabetes
    Correct
2
Which of the following sounds cannot be heard by human beings?
  • A
    Frequency of 1000 Hz
  • B
    Frequency of 10 kHz
  • C
    Frequency of 10 Hz
    Correct
  • D
    Frequency of 100 Hz
3
The police use high frequency whistles which can be heard by
  • A
    Human
  • B
    Dogs
    Correct
  • C
    Horse
  • D
    Bat
4
Motion of which of these object is known as periodic motion?
  • A
    Train
  • B
    Flying bird
  • C
    Aeroplane
  • D
    Pendulum
    Correct
5
Lightening and thunder occurs together but lightening is seen earlier than sound as
  • A
    Light do not require medium for propagation
  • B
    Light travels faster than sound
    Correct
  • C
    The sound produced is inaudible
  • D
    Sound travels in absence of light
6
The time period of a vibration 500Hz is equal to
  • A
    0.5 seconds
  • B
    0.002 seconds
    Correct
  • C
    0.02 seconds
  • D
    0.2 seconds
7
Which of the following generally do not cause noise pollution?
  • A
    Machines
  • B
    Vehicles
  • C
    Sitar
    Correct
  • D
    Loudspeakers
8
A child with hearing loss may have
  • A
    Defective speech
    Correct
  • B
    Longer tongue
  • C
    Black skinned
  • D
    Short stature
9
Which of the following have voice of higher frequency and shriller?
  • A
    Dog
  • B
    Man
  • C
    Bat
  • D
    Woman
    Correct
10
Vibration is also known as
  • A
    Oscillatory motion
    Correct
  • B
    Non-periodic motion
  • C
    Vibratory motion
  • D
    Periodic motion
11
When the amplitude of sound is large, the sound produced is
  • A
    Not audible
  • B
    Feeble
  • C
    No change due to amplitude
  • D
    Loud
    Correct
12
Voice of male is heavy compared to woman because
  • A
    Male vocal cord is larger
    Correct
  • B
    Male vocal cord is small
  • C
    Female vocal cord is large
  • D
    Female vocal cord is small
13
The sound which is unpleasant to ear is called
  • A
    Note
  • B
    Tone
  • C
    Music
  • D
    Noise
    Correct
14
Which of the following method is used to reduce the noise pollution along roads?
  • A
    Controlling traffic at road
  • B
    Planting trees around roads
    Correct
  • C
    Installing sound absorbent
  • D
    Widening the road
15
Different types similar sounds can be differentiated due to
  • A
    Difference in quality
  • B
    Difference in amplitude only
  • C
    Difference in amplitude and frequency
    Correct
  • D
    Difference in frequency only