Q.31)-The waves used in sonography are
  • Micro waves
  • Infra-red waves
  • Sound waves
  • Ultrasonic waves
Q.32)-Echo is produced due to
  • Reflection of sound
  • Refraction of sound
  • Resonance
  • None of these
Q.33)-SONAR is based on the principle of
  • Echo
  • Resonance
  • Reverberation
  • None of these
Q.34)-Instrument used to study the behaviour of a vibrating string is
  • Hygrometer
  • Sonometer
  • Barometer
  • Hydrometer
Q.35)-Sound travels fastest in
  • Steel
  • Air
  • Water
  • Vaccum
Q.36)-Speed of sound in a gas is proportional to
  • Square root of isothermal elasticity
  • Square root of adiabatic elasticity
  • Isothermal elasticity
  • Adiabatic elasticity
Q.37)-The doppler's effect is applicable for
  • Light wave
  • Sound wave
  • Space wave
  • Both (A) and (B)
Q.38)-Which one of the following animals can hear ultrasonic sound?
  • Rat
  • Squirrel
  • Cat
  • Bat
Q.39)-Submerged objects can be located using
  • Radar
  • Sonar
  • Quasar
  • Pulsar
Q.40)-Velocity of sound in air does not change with the change of
  • Temperature of air
  • Pressure of air
  • Moisture content in air
  • Wind in the direction of propagation of sound