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Environmental Engineering in CE

Environmental Engineering in CE
Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about __________ decibels.

90
180
120
150

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Environmental Engineering in CE
The destruction of water-borne pathogens is termed as disinfection of water. Which of the following is a water disinfectant?

Alkyl benzene sulphonate (ABS)
Chlorine
Alkalis
Benzene hexachloride

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Environmental Engineering in CE
Ozone is

A secondary pollutant
Impervious to ultra-violet rays
A primary pollutant
Both B & C

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Environmental Engineering in CE
TLV of ozone (O₃) and phosgene (COCl₂) in air is __________ ppm.

0.1
25
1000
100

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Environmental Engineering in CE
In the context of the chemical process industries, the term BOD is normally associated with the

Characterisation of liquid effluents
Characterisation of boiler feed water
Organic concentration in gaseous effluents
Characterisation of solid wastes

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Environmental Engineering in CE
Ambient noise level can be reduced by __________ decibels by planting trees (like coconut, neem etc.) near public utility buildings (like hospitals & schools).

43832
15-20
25-30
43961

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