Q.1)-The velocity of sound in moist air is more than in dry air because the moist air has
  • Less pressure than dry air
  • More density than dry air
  • Less density than dry air
  • More pressure than dry air
Q.2)-Hertz is the unit of
  • Frequency
  • Wavelength
  • Intensity
  • Clarity of waves
Q.3)-The unit of noise pollution (level) is
  • Decibel
  • Decimal
  • Ppm
  • None of the above
Q.4)-What is decibel?
  • A musical instrument
  • Wavelength of noise
  • A musical note
  • Scale of sound level
Q.5)-The permissible noise level at residential area during day time is..
  • 45 dB
  • 55 dB
  • 75 dB
  • 80 dB
Q.6)-The range of frequency of ultrasonic wave.
  • Greater than 20 KHz
  • Greater than 20,000 KHz
  • Below than 20 KHz
  • Greater than 02 KHz
Q.7)-In which of the following frequency range, human car feels the senstivity of vibration of sound?
  • 0 - 5 Hz
  • 6 - 10 Hz
  • 11 - 15 Hz
  • 20 - 20,000 Hz
Q.8)-If the ratio of intensity of wave is 25:9. what is the ratio of their amplitude?
  • 50:18:00
  • 5:03
  • 3:05
  • 25:09:00
Q.9)-Supersonic air plane creates a shock wave called
  • Transition wave
  • Ultrasound wave
  • Sonic boom
  • Transverse
Q.10)-Which of the following does not have any effect on velocity of sound?
  • Pressure
  • Temperature
  • Humidity
  • Density