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Environmental Engineering in CE

Environmental Engineering in CE
Presence of a certain minimum quantity of flourine is desirable in potable water to prevent

Dental cavities
Water-borne disease
Scale formation
Corrosion

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Environmental Engineering in CE
Industrial workers working in leather tanning & manufacturing units are prone to suffer from

Silicosis
Skin diseases (e.g. dermatities)
Blurred vision
Respirtory ailments (e.g. bronchitis)

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Environmental Engineering in CE
Iron & manganese present as pollutant in water can not be removed by

Lime soda process or manganese zeolite process
Ion exchange process
Chlorination
Oxidation followed by settling & filtration

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Environmental Engineering in CE
The average thickness of ozone layer in stratosphere is about __________ dobson unit (DU).

750
1500
20
230

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Environmental Engineering in CE
Which of the following radioactive wastes emits all α, β & γ rays and hence is the most hazardous of all radioactive emitters?

Au-198
I-131
Sr-90
Ra-226

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Environmental Engineering in CE
Dose of chlorine for disinfection of water is about __________ mg/litre of water.

0.3
0.1
0.01
1

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