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Environmental Engineering in CE

Environmental Engineering in CE
Permissible safe limit (TLV) of __________ toxic gas is 100-1000 parts per million (ppm).

Extremely
Highly
Moderately
Very extremely

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Environmental Engineering in CE
The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the

None of these
Ionosphere
Stratosphere
Troposphere

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Environmental Engineering in CE
Main pollutant present in automobile exhaust is

NO
CO₂
CO
Hydrocarbons

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Environmental Engineering in CE
Inorganic impurities causing water pollution is

Fats
Salts of metals
Carbohydrates
Protein

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Environmental Engineering in CE
Inhalation of silica dust by human being during hand drilling in mica mining, lead & zinc mining, silica refractory manufacture and in foundaries causes

Shortness of breath
Asphyxiation (suffocation)
All of these
Tuberculosis

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Environmental Engineering in CE
Which of the following is not an air pollutant?

Metallic powders
Pesticides
Ozone
Carcinogens

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