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