A) 17 ppm or more
B) Less that 5 ppm
C) Less than 4 ppm
D) Less than 3 ppm
Correct Answer: A
Solution :
Biochemical oxygen demand or B.O.D is the amount of dissolved oxygen needed by aerobic biological organisms in a body of water to break down organic material present in a given water sample at certain temperature over a specific time period. BOD value of less than 5 ppm is considered as 'clean water, while BOD value of 17 ppm or more is highly polluted water.
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