WT4201 Quiz 2 Chapter 4

Noise is

• loud sound

• constant sound

• unwanted sound

• sound of high frequency

The unit measurement of sound is

• Joule

• Ohm

• Ampere

• Decibel

Which of the following is not the effect of noise?

• Sleeplessness

• Hearing loss

• High blood pressure

• Flourosis

What is the dB of a threshold of hearing?

• 0

• 10

• 50

• 100

All sound is noise.

• True

• False

In a city the noise levels represented by equivalent sound pressure level over 8 years were reported as 80 dB (A). What does 'A' refer to?

• A type of amplifier used in the measurement

• A type of microphone used in the measurement

• The measurement of daytime

• A type of weighting used in the measurement

The impact of noise pollution on human health is governed by:

a) Intensity of noise

b) Duration of noise

c) Sensitivity of human ear

d) Frequency range of noise

e) Individual socio-economic status

• a,b,d,e

• a,b,c,d

• a, b and c only

• a,b,c,d,e

_________ scale is used for loudness of sound or noise.

• Linear

• Logarithmic

• Exponential

• None of the above

What measuring instrument can be used to measure sound intensity?

• Sound level meter

• Frequency meter

• Ultrasonic meter

• Hydrometer

What will be the resultant decibel level when two sources make noise of equal decibels?

• Decibel level will be the same

• Decibel level will increase by 3 decibels

• Decibel level will decrease by 3 decibels

• Decibel level will be equal to the sum of decibels of the two sources