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Environmental Engineering in CE

Environmental Engineering in CE
The commonest form of iron & manganese found in ground water as pollutant is in the form of their

Carbonates
Sulphides
Chlorides
Bi-carbonates

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

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

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Environmental Engineering in CE
TLV of mercury in potable (drinking) water is about __________ ppm.

1
0.1
5
0.001

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Environmental Engineering in CE
The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is

Fluctuation in liquid flow
Pipe vibrations
Boundary layer separation
Cavitation

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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
Ra-226
Sr-90

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Environmental Engineering in CE
A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from __________ ppm.

3000 to 6000
1000 to 2000
6000 to 9000
10000 to 100000

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