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WorksheetsWT4201 Quiz 2 Chapter 4
Total questions: 15
Worksheet time: 5mins
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
In a sinusoidal wave of sound pressure, the number of times a peak arrives in one second is called as
wavelength
amplitude
period
frequency
Allowed noise level in residential areas during daytime in Brunei
55dBA
60dB
65dBA
75dBA
The frequency for audible sound (in Hz) ranges from
2-2000
1000-10000
20-20000
40-40000
Increase in pressure cause the sound to
remain unchanged
remain unchanged up to a certain range
become weaker
become louder
Which of the following factors will NOT increase noise level.
Positive wind (Source to Receptor)
Negative wind (Receptor to Source)
Temperature inversion
Hard surfaces (Concrete)
