Multiple choice general knowledge

Of the following indications of the health of a water body, which is the most widely accepted means of measuring how polluting an effuent is?

  1. COD (chemical oxygen demand)

  2. BOD (biological oxygen demand)

  3. Chloroform content

  4. non of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

BOD (Biological Oxygen Demand) is the most widely accepted indicator of water pollution because it measures the amount of oxygen required by microorganisms to decompose organic matter in water. High BOD indicates severe organic pollution that can deplete dissolved oxygen and harm aquatic life. COD measures chemical oxidization but is less representative of natural conditions. Chloroform content is not a standard pollution indicator.

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