Noise & Sound

How is traffic noise measured?

• Sound Level Meter

• Frequency recorder

• Sound analyzer

• S-F Meter

In which unit sound is measured?

• Kilogram

• Pascal

• Decibel

• Kilometer

What is an Important factor to affect the noise level readings?

• Indoor measurement only

• Distance between source and source of sound

• The direction the noise source is facing

• Outdoor measurement only.

What are Ambient air quality standards in respect of noise for commercial areas?

• 65 dBA

• 75 dBA

• 70 dBA

• 80 dBA

What are the efficient ways to control aircraft noise?

• Increase the amount of pressure it can withstand

• Maximize the passengers to 100

• Building aircrafts with old technologies

• Constructing aerodromes far away from the residential areas

What is the dependence factor of degree of hearing loss?

• variation in noise

• Duration of noise

• Intensity of noise

• time

What is L90 noise?

• the noise level below for 90% of the time of the measurement duration

• The noise level exceeded for 10% of the time of the measurement duration

• the noise level below for 10% of the time of the measurement duration

• the noise level exceeded for 90% of the time of the measurement duration

Which one is not a fundamental step for noise pollution?

• Source

• Receiver

• Detector

• Path

Explain the suitable methods to reduce the Roadways noise?

• no signal alteration of roadway surface texture

• Use of noise barriers

• Unlimited vehicle speed and movement

• Avoid the tree plantation along the road

What are the day night equivalent values of sound level?

• Lnd

• L10

• L50

• Ldn