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Environmental Engineering in CE

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?

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

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Environmental Engineering in CE
Acute danger to human life (i.e. death) exists, if the concentration of CO₂ in atmospheric air exceeds __________ percent (by volume).

20
7
3
1

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

Chloramine
Aluminium sulphate
Ferrous sulphate
Hydrated lime

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Environmental Engineering in CE
In troposphere (the weather domain), the temperature 't' at height 'h' above the spa level in metres is given by (where, temperature at sea level is 15°C and t is in °C.)

t = 15 + 0.0065h
t = 15 - 0.0065h
t = 0.0035h -15
t = 15 - 0.0035h

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Environmental Engineering in CE
A 'body' which allows the short wavelength incoming solar radiation to enter in, but does not allow long wave length outgoing infra red radiation to escape out is called the

Ionosphere
Green house
Atmospheric effect
Global warming

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Environmental Engineering in CE
Which is the best and the most effective method for the removal of organic contaminant present in the polluted water in very small quantity (say < 200 mg/litre)?

Biological oxidation pond
Lagooning
Activated carbon adsorption
Chemical coagulation

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