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