Multiple choice

BOD level in fresh water should not exceed beyond:

  1. 5 ppm

  2. 10 ppm

  3. 25 ppm

  4. 50 ppm
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

BOD (Biochemical Oxygen Demand) measures the amount of dissolved oxygen consumed by microorganisms in water. A BOD level of 5 ppm is the standard maximum acceptable limit for fresh water to maintain aquatic life and prevent oxygen depletion. Higher BOD levels indicate organic pollution and can lead to eutrophication.

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