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Environmental Engineering in CE

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).

7
1
3
20

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Environmental Engineering in CE
A standard test for determination of hardness in water is termed as __________ test.

Presumptive
Electometric
EDTA
Total count

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

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

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Environmental Engineering in CE
Out of the following, TLV of __________ is maximum (about 500 ppm).

Carbon dioxide
Acetaldehyde
Carbon disulphide
Toluene

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Environmental Engineering in CE
TLV of ammonia, nitrogen dioxide and phenol vapor in air is __________ ppm.

1000
5
100
2000

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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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