Q.41)-The frequency of ultrasound wave is typically
  • Above 20,000 KHz
  • Above 20 Khz
  • Below 02 KHz
  • Below 2000 KHz
Q.42)-The velocity of sound in air
  • Decreases with increase of temperature
  • Increase with decrease of temperature
  • Does not depend on tempearture
  • Decreases with decrease in temperature
Q.43)-The device which converts sound energy into electrical energy is called
  • Amplifier
  • Speaker
  • Microphone
  • Transmitter
Q.44)-Least aduible sound for most of the human ear is
  • 10.0 µ bar
  • 0.0002 µ bar
  • 0.005 µ bar
  • 5.0 µ bar
Q.45)-The ordinary and maximum tolerance limit of sound by human being is
  • 50 dB to 70 dB (decibel)
  • 60 dB to 80 dB (decibel)
  • 65 dB to 75 dB (decibel)
  • 70 to dB to 85 dB (decibel)
Q.46)-Sound is heard over longer distances on rainy days because
  • Sound travels slowly in moist air
  • Sound travels faster in moist air
  • Moist air does not absorb sound
  • Moist air absorbs sound
Q.47)-Which of the following property of sound is affected by change in air temperature
  • Frequency
  • Intensity
  • Amplitude
  • Wavelength
Q.48)-A person standing on a railway platform listens to the whistles of arriving and departing trains.
  • The same in both cases in all respects
  • Of higher intensity when train arrives
  • Of higher pitch when train arrives
  • Of higher pitch when train departs
Q.49)-Which term is not associated with sound wave?
  • Hertz
  • Decibel
  • Candela
  • Mach
Q.50)-If density of oxygen is 16 times that of hydrogen. What will be their corresponding ratio of velocity of sound?
  • 4:01
  • 2:01
  • 1:16
  • 1:04