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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?

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

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Environmental Engineering in CE
Siderosis is a disease caused by the inhalation of __________ dust.

Iron
Silica
Coal
None of these

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

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Environmental Engineering in CE
Out of the following, TLV of __________ is the minimum (about 0.02 ppm).

Phosgene
MIC (methyl iso-cynate)
Bromine
Ozone

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Environmental Engineering in CE
Direct reaction of unsaturated hydrocarbons with either NO or NO₂ produces an eye irritating pollutant compound known as

Poly acrylonitrile
Peroxy acetyl nitrate (PAN) or methyl nitrile
Photochemical smog
Benzopyrene

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Environmental Engineering in CE
Most of the atmospheric air pollutants are present in large quantity in

Stratosphere
Thermosphere
Mesosphere
Trophosphere

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