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
Noise pollution may cause
  • A
    Intestinal disease
  • B
    Hearing impairment
    Correct
  • C
    Mental disorder
  • D
    Skin disease
2
Time taken by an object to complete one oscillation is called
  • A
    Vibration
  • B
    Rarefaction
  • C
    Frequency
  • D
    Time period
    Correct
3
Shrillness of sound is determined by the ________ of vibration.
  • A
    Shape
  • B
    Size
  • C
    Height
  • D
    Number
    Correct
4
A pendulum oscillates 40 times in 4 seconds. The time period of vibration will be
  • A
    0.1s
    Correct
  • B
    1s
  • C
    4s
  • D
    0.4 s
5
Loud sound can be produced by
  • A
    Larger amplitude
    Correct
  • B
    High pitch
  • C
    Low pitch
  • D
    Smaller amplitude
6
Plantation on the road side can
  • A
    Reduce noise pollution
    Correct
  • B
    Increase air pollution
  • C
    Reduce air pollution
  • D
    Increase noise pollution
7
We must never put a sharp, pointed things into our ear because it can
  • A
    Damage eardrum
    Correct
  • B
    Reduce the thickness of eardrum
  • C
    Break auditory nerve
  • D
    Damage cochlea
8
Time-period of a wave is 0.01seconds than its frequency is
  • A
    10 Hz
  • B
    10000 Hz
  • C
    1000 Hz
  • D
    100 Hz
    Correct
9
The to and fro motion of an object is known as
  • A
    Vibration
    Correct
  • B
    Pendulum
  • C
    Wavelength
  • D
    Frequency
10
An object oscillates 20 times in 1 second. The frequency of the wave produced will be
  • A
    20 Hz
    Correct
  • B
    10 Hz
  • C
    0.2 Hz
  • D
    15Hz
11
The repetition of sound caused by the reflection of sound waves is called
  • A
    Echo
    Correct
  • B
    Reflection of sound
  • C
    Reverberation
  • D
    Propagation
12
The loudness above __________ becomes physically painful noise.
  • A
    80 dB
    Correct
  • B
    20 dB
  • C
    10 dB
  • D
    40 dB
13
A bird makes high pitched sound but a lion makes a ______________ roar.
  • A
    Without pitch
  • B
    High pitched
  • C
    Low pitched
    Correct
  • D
    Equal pitch
14
Ultrasound equipment for investigating and tracking medical problems, works at frequency
  • A
    Lower than 20 kHz
  • B
    At 20 kHz only
  • C
    At any frequency
  • D
    Higher than 20 kHz
    Correct
15
The sound which is pleasant to hear is called
  • A
    Noise
  • B
    Audible sound
  • C
    Musical sound
    Correct
  • D
    Inaudible sound