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

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

Troposphere

Stratosphere

None of these

Ionosphere

Troposphere

Stratosphere

None of these

Ionosphere

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Environmental Engineering in CE
Pick out the one which is not a chemical coagulant.

Aluminium sulphate

Ferrous sulphate

Chloramine

Hydrated lime

Aluminium sulphate

Ferrous sulphate

Chloramine

Hydrated lime

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Environmental Engineering in CE
Water effluent generated in printing industry is decolourised by

Ion exchange technique

Electrolytic decomposition

Adsorption

Reverse osmosis

Ion exchange technique

Electrolytic decomposition

Adsorption

Reverse osmosis

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Environmental Engineering in CE
Cleaning is done by(i) Scraping and removal in filters slow sand(ii) Back washing in slow sand filters(iii) Scraping and removal in filters rapid sand(iv) Back washing in rapid sand filtersThe correct answer is

(i) and (iv)

(i) and (ii)

(ii) and (iii)

(ii) and (iv)

(i) and (iv)

(i) and (ii)

(ii) and (iii)

(ii) and (iv)

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Environmental Engineering in CE
Aerobic biological oxidation ponds used for the purification of polluted water

All of these

Is not very effective for nonbiodegradable substances (e.g. ABS) containing effluents

Destroys/removes pathogen from the sewage

Destroys/removes pathogen much more effectively if the sewage is chlorinated

All of these

Is not very effective for nonbiodegradable substances (e.g. ABS) containing effluents

Destroys/removes pathogen from the sewage

Destroys/removes pathogen much more effectively if the sewage is chlorinated

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Environmental Engineering in CE
Infective bacteria in water is killed by the __________ process.

Disinfection

None of these

Sterilisation

Aeration

Disinfection

None of these

Sterilisation

Aeration

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Environmental Engineering in CE

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

Environmental Engineering in CE Pick out the one which is not a chemical coagulant.

Environmental Engineering in CE Water effluent generated in printing industry is decolourised by

Environmental Engineering in CE Cleaning is done by(i) Scraping and removal in filters slow sand(ii) Back washing in slow sand filters(iii) Scraping and removal in filters rapid sand(iv) Back washing in rapid sand filtersThe correct answer is

Environmental Engineering in CE Aerobic biological oxidation ponds used for the purification of polluted water

Environmental Engineering in CE Infective bacteria in water is killed by the __________ process.

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

Environmental Engineering in CE
Pick out the one which is not a chemical coagulant.

Environmental Engineering in CE
Water effluent generated in printing industry is decolourised by

Environmental Engineering in CE
Cleaning is done by(i) Scraping and removal in filters slow sand(ii) Back washing in slow sand filters(iii) Scraping and removal in filters rapid sand(iv) Back washing in rapid sand filtersThe correct answer is

Environmental Engineering in CE
Aerobic biological oxidation ponds used for the purification of polluted water

Environmental Engineering in CE
Infective bacteria in water is killed by the __________ process.