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Environmental Engineering in CE

Environmental Engineering in CE
The pH value of potable water should be between

1 to 1.5
4 to 5
13 to 14
6.5 to 8

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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

(ii) and (iv)
(i) and (ii)
(ii) and (iii)
(i) and (iv)

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Environmental Engineering in CE
Carbon monoxide is a pollutant, which causes

Damage to building materials like marble
Retardation in crop growth
Asphyxiation (suffocation) leading to death
Respiratory disease (e.g. asthma)

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Environmental Engineering in CE
Iron & manganese present in the polluted water is removed by

Chemical coagulation
Chlorination only
Oxidation followed by settling & filtration
Simple filtration

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Environmental Engineering in CE
Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gas-air mixture), rendering it the property of the most explosive gas?

Hydrogen
Acetylene
Carbon monoxide
Ammonia

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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

Asphyxiation (suffocation)
All of these
Shortness of breath
Tuberculosis

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