Increased biological oxygen demand is an indication of

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ESE 2018 Prelims Paper I
Engineering aptitude
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Engineering aptitude

48

M: +2.00/-0.66

Increased biological oxygen demand is an indication of
1) Low microbial contamination.
2) Absence of microbial pollution.
3) High level of microbial contamination.
Which of the above statements is/are correct?

[ESE 2018 Prelims Paper I]

A 1 only

B 2 only

C 3 only

D 1, 2 and 3