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
Pitch of sound depends upon
  • A
    Time-period
  • B
    Amplitude
  • C
    Wavelength
  • D
    Frequency
    Correct
2
The time-period is
  • A
    Proportional to frequency
  • B
    Equal to frequency
  • C
    Proportional to wave-length
  • D
    Inversely proportional to frequency
    Correct
3
Tympanic membrane is another name of
  • A
    Anvil
  • B
    Eardrum
    Correct
  • C
    Cochlea
  • D
    Voice-box
4
Damage to which of the following parts of ear cause hearing impairment?
  • A
    Ear canal
  • B
    Tympanic membrane
    Correct
  • C
    Oval window
  • D
    Pinna
5
The nature of sound waves is
  • A
    Mechanical wave
  • B
    Electromagnetic wave
  • C
    Longitudinal wave
    Correct
  • D
    Transverse wave
6
Ultrasound equipment for investigating and tracking medical problems, works at frequency
  • A
    At 20 kHz only
  • B
    Lower than 20 kHz
  • C
    Higher than 20 kHz
    Correct
  • D
    At any frequency
7
The SI unit of frequency is
  • A
    Hertz
    Correct
  • B
    Lambda
  • C
    Decibel
  • D
    Meter
8
The minimum distance from sound reflecting surface to hear an echo is about
  • A
    17.2 m
    Correct
  • B
    35 m
  • C
    20 m
  • D
    27.2 m
9
Speed of sound __________ with increase in temperature
  • A
    Decrease
  • B
    May increase or decrease
  • C
    Increase
    Correct
  • D
    Remain same
10
The sound which is unpleasant to ear is called
  • A
    Tone
  • B
    Note
  • C
    Music
  • D
    Noise
    Correct
11
One of the most common well-known periodic motion is that of
  • A
    Quartz clock
  • B
    Sundial
  • C
    Simple pendulum
    Correct
  • D
    Digital clock
12
The SI unit of wavelength is
  • A
    Meter
    Correct
  • B
    Lambda
  • C
    Hertz
  • D
    Micron
13
Range of audible sound is
  • A
    More than 20,000Hz
  • B
    20Hz to 20,000 Hz
    Correct
  • C
    More than 20Hz
  • D
    Less than 20Hz
14
The sound of frequency more than 20,000Hz is called
  • A
    Audible sound
  • B
    Infrasound
  • C
    Ultrasound
    Correct
  • D
    Longitudinal sound
15
Ultrasound is used in
  • A
    X-rays
  • B
    Echocardiography
    Correct
  • C
    Micrometer
  • D
    Speedometer