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Environmental Engineering in CE

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

Electometric
Presumptive
EDTA
Total count

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Environmental Engineering in CE
Septic tanks are used for the __________ of the deposited solids.

Anaerobic decomposition
Aerobic decomposition
Separation
None of these

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Environmental Engineering in CE
The type of bacteria which is active in trickling filter during biological treatment of sewage is the __________ bacteria.

Anaerobic
Aerobic
Parasitic
Saphrophytic

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Environmental Engineering in CE
Average human body contains about __________ percent water by weight.

40
70
85
20

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Environmental Engineering in CE
Maximum permissible limit of mercury in human blood is __________ micrograms/100 c.c.

7
19
1
82

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Environmental Engineering in CE
Which of the following causes death by asphyxiation, if its presence in atmospheric air exceeds maximum allowable concentration (i.e. > 50 ppm)?

Benzopyrene
Peroxyacyl nitrate
Carbon monoxide
Sulphur dioxide

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