NCERT/Class 9/Science/Sound

Sound

Class 9 · Science

20 questions11 easy6 medium3 hard

Sample Questions

Q1.What is infrasound?

  • ASound with frequency less than 20 Hz
  • BSound greater than 20,000 Hz
  • CLoud sound
  • DReflected sound

Q2.What is frequency?

  • ANumber of oscillations per unit time
  • BDistance between waves
  • CSpeed of vibration
  • DHeight of waves

Q3.What are longitudinal waves?

  • AWaves where particles vibrate in direction of wave propagation
  • BWaves perpendicular to propagation
  • CWaves that don't move
  • DCircular waves

Q4.What is pitch?

  • APerception of frequency of sound
  • BLoudness of sound
  • CSpeed of sound
  • DAmplitude of sound

Q5.What is reverberation?

  • AMultiple reflections of sound in a closed space
  • BAbsorption of sound
  • CReduction of sound
  • DTransmission of sound

Q6.This is a sample question to preview what you'll get in the full practice test...

  • A. Option one
  • B. Option two
  • C. Option three
  • D. Option four
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Concepts Covered

AmplitudeDecibelsDoppler EffectEchoFrequencyHuman HearingInfrasoundLongitudinal WavesLoudnessMediumOscillationsPitchPowerReflection of SoundRelative MotionReverberationSI UnitsSoundSound IntensitySound PerceptionSound PropagationSound ReflectionSound WavesSpeed of SoundUltrasoundWave VelocityWavelengthWaves

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