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Chemical Engineering - Environmental Engineering

Exercise : Environmental Engineering - Section 5
6.
Fluorosis is caused due to the presence of excessive amount of __________ in drinking water.
mercury
lead
fluoride
arsenic
Answer: Option
Explanation:
No answer description is available. Let's discuss.
7.
Presence of nitrogen and phosphorous in waste water discharged into lakes and ponds causes
foaming
odour nuisances
undesirable plant growth
turbidity
Answer: Option
Explanation:
No answer description is available. Let's discuss.
8.
Pick out the wrong statement.
Biological oxygen demand (BOD) is a characteristic and not a constituent of water.
BOD is a measure of the amount of oxygen which will be demanded & used in 5 days by the biological decomposition of the organic matter present in water stream present as food for the living organism.
BOD is expressed in mg/litre (typically, BOD=2.5 mg/litre for potable water).
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
9.
The pH value of potable water should be between
1 to 1.5
6.5 to 8
13 to 14
4 to 5
Answer: Option
Explanation:
No answer description is available. Let's discuss.
10.
Maximum permissible limit of mercury in human blood is __________ micrograms/100 c.c.
1
7
19
82
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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