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
A moving swing has
  • A
    Rotational motion
  • B
    Non periodic motion
  • C
    Circular motion
  • D
    Periodic motion
    Correct
2
The object vibrating in the sound of sitar is
  • A
    Membrane
  • B
    Wooden box
  • C
    Prone
  • D
    String
    Correct
3
Speed of sound ____________ with increase in humidity.
  • A
    Decrease
  • B
    Increase
    Correct
  • C
    Do not change
  • D
    Remain same
4
The substance through which sound travels is called
  • A
    Water only
  • B
    Metals only
  • C
    Air only
  • D
    Medium
    Correct
5
Speed of sound in water is about
  • A
    300 m/s
  • B
    1500 m/s
    Correct
  • C
    5000 m/s
  • D
    1000 m/s
6
Vibration of which of the following produce hearing sensation in our ear?
  • A
    Ear bones
  • B
    Cochlea
  • C
    Optic nerve
  • D
    Eardrum
    Correct
7
Upper end of windpipe is called
  • A
    Voice box
    Correct
  • B
    Neck
  • C
    Throat
  • D
    Epiglottis
8
Explosive noise caused by the shock of waves from an aircraft traveling faster than the speed of sound is called
  • A
    Noise
  • B
    Infrasonic
  • C
    Supersonic sound
  • D
    Sonic boom
    Correct
9
The bouncing back of sound when it strikes a hard surface is called
  • A
    Refraction of sound
  • B
    Propagation of sound
  • C
    Transmission of sound
  • D
    Reflection of sound
    Correct
10
Voice box is also known as
  • A
    Windpipe
  • B
    Vocal chord
  • C
    Tongue
  • D
    Larynx
    Correct
11
Stethoscope works on the principle of
  • A
    Reflection of sound
    Correct
  • B
    Frequency of sound
  • C
    Movement of sound
  • D
    Hearing of sound
12
Which of the following device works on principle of multiple reflection of sound?
  • A
    Bulb horn
    Correct
  • B
    Gaiter
  • C
    RADAR
  • D
    SONAR
13
A concave board which is placed behind the speaker in large halls or auditoriums is called
  • A
    Sound reflector
  • B
    Soundboard
    Correct
  • C
    Sound box
  • D
    Sound catcher
14
SONAR is used to
  • A
    Detect the enemies fighter plane
  • B
    Detect the submarines
    Correct
  • C
    Cyclone warning
  • D
    Weather forecast
15
Sonic booms is produced by
  • A
    Supersonic planes
    Correct
  • B
    Passenger planes
  • C
    High speed cars
  • D
    Express trains