Sounds which are below 20Hz frequencies are called

  • infrasound
  • ultrasound
  • mega sound
  • micro sound

A form of energy which is produced by vibrations and can be detected by ears is called

  • sound
  • waves
  • heat
  • electric current

Loudness is measured by

  • sound level meter
  • spectrometer
  • thermostat
  • thermometer

Sound travels at speed of 5960m/s in

  • air
  • water
  • steel
  • water

The regions where molecules are compressed are called

  • rarefactions
  • compressions
  • digressions
  • progressions

Voice is produced by the vibrations of

  • vocal cords
  • trachea
  • lungs
  • heart

A loud sound contains more energy than

  • soft sound
  • aero plane sound
  • blast sound
  • rocket sound

The human ear can be divided in to

  • outer ear
  • middle ear
  • inner ear
  • all of them

Sound travels at a speed of 343m/s in

  • air
  • water
  • steel
  • water

A distinctive quality of a sound which depends on the frequency of sound is called a

  • pitch
  • frequency
  • ultrasound
  • infrasound

The chain of tiny bones in ear includes

  • hammer
  • anvil
  • stirrup
  • all of them

A thin sheet of membrane which is stretched tightly across the end of ear canal is called

  • pinna
  • ear drum
  • hammer
  • cochlea

Loudness is measured in units called

  • Hertz
  • decibels
  • Pascal
  • ampere

The first part of ear which collects air which is funnel shaped is called

  • pinna
  • ear drum
  • hammer
  • cochlea

Sound sensor when connected to data logger helps in measuring

  • sound
  • voice
  • pitch
  • frequency

The wavelength of the high frequency sound wave is

  • longer
  • shorter
  • same
  • constant

He symbol of decibel is

  • Dc
  • dB
  • Dec
  • dl

Humans can hear the sound within range

  • 20Hz - 20000Hz
  • 10Hz-10000Hz
  • 200Hz-20000Hz
  • 30Hz--30000Hz

The SI unit of frequency is

  • hertz
  • Newton
  • Pascal
  • ampere

The brain interprets vibrations and electrical signals as

  • sounds
  • actions
  • reactions
  • movements
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