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Environmental Engineering in CE

Environmental Engineering in CE
__________ content of the phosphate rock is the pollutant of primary interest in a phos-phatic fertiliser plant.

Calcium
Phosphorous
Sulphur
Fluorine

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Environmental Engineering in CE
Which of the following is the most detrimental for water used in high pressure boiler?

Dissolved oxygen
Turbidity
Silica
Phenol

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Environmental Engineering in CE
Oil and grease present in an emulsified state in waste water discharged from industries can be removed by

Skimming off
Chlorination
Settling out using chemical reagents
Biological oxidation

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Environmental Engineering in CE
The earth's atmosphere is an envelope of gases present upto a height of about __________ kms.

2000
1000
10
200

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Environmental Engineering in CE
If the coli form bacteria is present in a sample of water, then the coli-form test to be conducted is(i) Presumptive coli-form test(ii) Confirmed coli-form test(iii) Completed coli-form test

Both (i) and (ii)
Only (i)
All (i), (ii) and (iii)
Both (i) and (iii)

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Environmental Engineering in CE
Water filtration rate in a slow sand filter ranges from __________ litres/m²/hr.

10 to 20
4000 to 5000
1500 to 2500
100 to 200

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