If frequency increases,

  • wavelength also increases
  • amplitude also increases
  • number of waves also increases
  • amplitude decreases

Sound is made louder by increasing

  • wavelength
  • frequency
  • wave front
  • amplitude

Trombone is also an example of

  • wind instrument
  • string instrument
  • soprano instrument
  • brass instrument

Vibrations are caused due to

  • change of temperature of air
  • change of pressure in air
  • effect of humidity on air
  • level of heat in air

In large empty rooms, even a click keeps on

  • increasing
  • decreasing
  • repeating
  • coming

Sounds of thunder and horn of lorries are known as

  • loud sounds
  • soft sounds
  • high pitched sounds
  • low pitched sounds

Sound is created by our vocal cord due to

  • air in lungs
  • cilia in the throat
  • vibration in throat
  • vibration in lungs

Like light, sound cannot

  • pass through transparent solids
  • pass through air
  • pass through liquids
  • pass through vacuum

'Ultrasound' is a reflection of

  • soft tissues only
  • hard tissues only
  • both soft and hard tissues
  • hard muscles only

Three main types of musical instruments are

  • guitar, violin and piano
  • drum, guitar and piano
  • stringed instrument, wind instrument and percussion instrument
  • stringed instrument, wind instrument and beat n bass instrument

As compare to air, sound travels faster in

  • liquids
  • gases
  • vacuum
  • fluids

Sounds of vehicles, aircrafts and machines are called

  • artificial sounds
  • natural sounds
  • noise
  • normal sounds

The organs of a human that detect sounds are

  • eyes
  • ears
  • feet
  • hands

Sound is a form of

  • force
  • power
  • light
  • energy

The loudness of sound is also known as

  • amplitude
  • wave front
  • volume
  • pace of sound

The more dense the liquid, the

  • more slow the speed of sound
  • more fast the speed of sound
  • more distance covered by the sound
  • less distance covered by the sound

The only thing of a note that can vary, is

  • amplitude
  • length
  • wave
  • type

Loud noise can

  • damage our ears
  • make us ill
  • disturb our sleep
  • interrupt conversation

The normal value of decibel that our ears can detect is

  • -20
  • 0
  • 20
  • 40

A drum makes sound of

  • high frequency
  • low amplitude
  • high pitch
  • low pitch

An example of longitudinal wave is

  • slinky spring
  • light
  • energy
  • water wave

Sound loses more energy in

  • air
  • vacuum
  • liquid
  • solid

The note also depends on

  • diameter of the drum
  • thickness of string
  • tension of string
  • distance of wind holes

Large empty room often sounds

  • full
  • hollow
  • noisy
  • repeating

For communication astronauts use radio because

  • sound travels at very high speed in vacuum
  • sound does not travel in vacuum
  • vacuum repels sounds
  • sound energy turns into light in vacuum

The pitch of the note depends upon the

  • tension on string
  • diameter of wind hole
  • tension on drum surface
  • diameter of drum surface

The caliber of instrumental note depends on the

  • depth of drum
  • string length
  • length of wind holes
  • radius of wind holes

We cannot hear alarm of a clock if there is

  • vacuum in the jar
  • air in the jar
  • liquid in the jar
  • solid in the jar

The third effecter of sound created by vibrating strings is

  • angle of strings
  • thickness of strings
  • material of strings
  • height of strings

20 dB has hundred times more energy than

  • 10 dB
  • 0 dB
  • 5 dB
  • 2 dB
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