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What percentage of impurities make domes...

What percentage of impurities make domestic sewage unfit for human use?

A

` 1.0%`

B

` 0.1 %`

C

` 0.01 %`

D

` 0.001 %`

Text Solution

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The correct Answer is:
B
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Read the following statements carefully and find the incorrect statements: A. More than 1 percent impurities make domestic sewage unfit for human use. B. Less BOD causes mortality of fish and other aquatic creatures. C. Presence of large amounts of nutrients in water also causes excessive growth of planktonic algae, called an algal bloom. D. Algai bloom causes deterioration of the water quality an decreases fish mortality. E. Some bloom-forming algae are extremely toxic to human beings and animals. F. Eichhornia crassipies is the world's most problematic aquatic weed.

Assertion: A mere 0.1 per cent impurities make domestic sewage unfit for human use. Reason: Domestic sewage primarily contains biodegradable organic matter.

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