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Environmental Engineering in CE

Environmental Engineering in CE
Main pollutants released from iron & steel industry is

CO, CO₂ & SO₂
H₂S, NO & SO₃
SO₃, NO₂ & CO₂
CO₂, H₂S & NO₂

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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
Ra-226
I-131
Sr-90

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Environmental Engineering in CE
Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in 'gas chamber' is about __________ ppm.

100-1000
10-100
100-200

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Environmental Engineering in CE
In water chemical treatment plant, use of chloramines ensures

Taste & odour control
Disinfection
Weed control in reservoirs
Removal of permanent hardness

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Environmental Engineering in CE
Infective bacteria in water is killed by the __________ process.

Disinfection
Aeration
None of these
Sterilisation

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Environmental Engineering in CE
5-200 μm size particles are called

Colloids or aerosols
Smoke
Dust
Powder

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