As compared to rapid sand filters, slow sand filters give (i) Slower filtration rate (ii) Higher filtration rate (iii) Lesser efficiency in removal of bacteria (iv) Higher efficiency in removal of bacteria The correct answer is

Environmental Engineering in CE
As compared to rapid sand filters, slow sand filters give
(i) Slower filtration rate
(ii) Higher filtration rate
(iii) Lesser efficiency in removal of bacteria
(iv) Higher efficiency in removal of bacteria
The correct answer is

(i) and (ii)

(i) and (iv)

(ii) and (iv)

(ii) and (iii)

(i) and (ii)

(i) and (iv)

(ii) and (iv)

(ii) and (iii)

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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)

(ii) and (iii)

(ii) and (iv)

(i) and (ii)

(i) and (iv)

(ii) and (iii)

(ii) and (iv)

(i) and (ii)

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Environmental Engineering in CE
Fluorosis (a bone disease) is caused by the presence of high concentration of __________ in atmospheric air.

Nitrogen dioxide

Hydrocarbons

Hydrogen flouride

Hydrogen sulphides

Nitrogen dioxide

Hydrocarbons

Hydrogen flouride

Hydrogen sulphides

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Environmental Engineering in CE
Which is the most widely used coagulant for the treatment of turbid water?

Sodium aluminate

Lime

Ferric chloride

Alum (aluminium sulphate)

Sodium aluminate

Lime

Ferric chloride

Alum (aluminium sulphate)

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Environmental Engineering in CE
Smoke is produced due to

All of these

Insufficient supply of combustion air and insufficient time for combustion

Poor design & overloading of furnace

Poor quality of fuel and improper mixing of fuel & combustion air

All of these

Insufficient supply of combustion air and insufficient time for combustion

Poor design & overloading of furnace

Poor quality of fuel and improper mixing of fuel & combustion air

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Environmental Engineering in CE
The biological decomposition of organic substances in wastes controlled conditions is called

Biological oxidation

None of these

Composting

Incineration

Biological oxidation

None of these

Composting

Incineration

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Environmental Engineering in CE

Environmental Engineering in CE As compared to rapid sand filters, slow sand filters give(i) Slower filtration rate(ii) Higher filtration rate(iii) Lesser efficiency in removal of bacteria(iv) Higher efficiency in removal of bacteriaThe correct answer is

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 Fluorosis (a bone disease) is caused by the presence of high concentration of __________ in atmospheric air.

Environmental Engineering in CE Which is the most widely used coagulant for the treatment of turbid water?

Environmental Engineering in CE Smoke is produced due to

Environmental Engineering in CE The biological decomposition of organic substances in wastes controlled conditions is called

Environmental Engineering in CE
As compared to rapid sand filters, slow sand filters give
(i) Slower filtration rate
(ii) Higher filtration rate
(iii) Lesser efficiency in removal of bacteria
(iv) Higher efficiency in removal of bacteria
The correct answer is

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
Fluorosis (a bone disease) is caused by the presence of high concentration of __________ in atmospheric air.

Environmental Engineering in CE
Which is the most widely used coagulant for the treatment of turbid water?

Environmental Engineering in CE
Smoke is produced due to

Environmental Engineering in CE
The biological decomposition of organic substances in wastes controlled conditions is called