Noise Pollution Questions and Answers

Q: The unit for the measurement of noise pollution is :

Noise is measured in decibels.The decibel (dB) is a logarithmic unit of sound intensity level, so an increase of 10 dB means ten times the intensity. Noise standards and limits are expressed in dB, usually A-weighted, dB(A).Hertz measures frequency (pitch), watt measures power, and lux measures illuminance. None of them expresses loudness of noise.

Q: The unit of measuring the intensity of sound is

The intensity (loudness) of sound is measured in decibels.Sound intensity level is expressed on a logarithmic scale in decibels (dB): an increase of 10 dB means ten times the intensity. Normal conversation is about 60 dB and sounds above about 85 dB can damage hearing over time.The watt is a unit of power, the joule of energy, and the calorie of heat. Intensity in absolute terms is in W/m2, but the unit used for the intensity of sound in everyday measurement is the decibel.

Q: 'Green muffler' is a measure adopted to control

A green muffler is a measure to control noise pollution.A green muffler is a belt of dense trees and shrubs planted along roads, railways and highways, especially near homes, schools and hospitals. The foliage absorbs and scatters sound and so reduces traffic noise.Trees do also trap dust, which makes 'Air pollution' tempting, but the term green muffler refers specifically to noise control. It has no particular role in controlling water or soil pollution.

Q: Green muffler is used against which type of pollution ?

A green muffler is used against noise pollution.A green muffler is a belt of dense trees and shrubs planted along roads and highways, especially near homes, schools and hospitals. The foliage absorbs and scatters sound, reducing the traffic noise that reaches nearby buildings, just as a muffler quietens an engine.Trees do also trap dust and absorb some gases, which makes 'Air' the usual trap, but the term 'green muffler' is used specifically for noise control. It has no special role against soil or water pollution.

The unit for the measurement of noise pollution is :

A.Decibel
B.Hertz
C.Watt
D.Lux

Exam Year(s)

MPPSC Forest Service - 2022,

Answer: A

Noise is measured in decibels.

The decibel (dB) is a logarithmic unit of sound intensity level, so an increase of 10 dB means ten times the intensity. Noise standards and limits are expressed in dB, usually A-weighted, dB(A).

Hertz measures frequency (pitch), watt measures power, and lux measures illuminance. None of them expresses loudness of noise.

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The unit of measuring the intensity of sound is

A.Watt
B.Joule
C.Calorie
D.Decibels

Exam Year(s)

MPPSC Forest Service - 2022,

Answer: D

The intensity (loudness) of sound is measured in decibels.

Sound intensity level is expressed on a logarithmic scale in decibels (dB): an increase of 10 dB means ten times the intensity. Normal conversation is about 60 dB and sounds above about 85 dB can damage hearing over time.

The watt is a unit of power, the joule of energy, and the calorie of heat. Intensity in absolute terms is in W/m², but the unit used for the intensity of sound in everyday measurement is the decibel.

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'Green muffler' is a measure adopted to control

A.Air pollution
B.Noise pollution
C.Water pollution
D.Soil pollution

Exam Year(s)

Tripura Public Service Commission - 2025,

Answer: B

A green muffler is a measure to control noise pollution.

A green muffler is a belt of dense trees and shrubs planted along roads, railways and highways, especially near homes, schools and hospitals. The foliage absorbs and scatters sound and so reduces traffic noise.

Trees do also trap dust, which makes 'Air pollution' tempting, but the term green muffler refers specifically to noise control. It has no particular role in controlling water or soil pollution.

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Green muffler is used against which type of pollution ?

A.Air
B.Noise
C.Soil
D.Water

Exam Year(s)

Tripura Public Service Commission - 2019,

Answer: B

A green muffler is used against noise pollution.

A green muffler is a belt of dense trees and shrubs planted along roads and highways, especially near homes, schools and hospitals. The foliage absorbs and scatters sound, reducing the traffic noise that reaches nearby buildings, just as a muffler quietens an engine.

Trees do also trap dust and absorb some gases, which makes 'Air' the usual trap, but the term 'green muffler' is used specifically for noise control. It has no special role against soil or water pollution.

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The permissible limit of day time industrial noise as recommended by WHO is

A.80 dB
B.75 dB
C.90 dB
D.76 dB

Exam Year(s)

UGC NET - 2014,

Answer: B

The key gives (B), 75 dB, as the permissible limit of day-time industrial noise. This is the figure for industrial areas in the day under the Indian noise standards, and it is the one the key takes.

The figures of 80, 90 and 76 dB are not the limit that is accepted in the key for day-time industrial noise, so they are the wrong options.

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The resultant of two noise levels of 50 dB and 55 dB is

A.58 dB
B.55.41 dB
C.52.5 dB
D.56.19 dB

Exam Year(s)

UGC NET - 2014,

Answer: D

Sound levels do not add directly in decibels; the intensities add. The resultant of 50 dB and 55 dB is found by converting each level to intensity, adding, and converting back.

\[ L = 10 \log_{10}\left(10^{5} + 10^{5.5}\right) \]\[ L = 10 \log_{10}(416228) \approx 56.19\ dB \]

Adding 50 and 55 gives 105 dB, which is wrong. The option 58 dB and the others do not fit the logarithmic sum.

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