2. Questions Bank
  3. 8th Class
  4. Science
  5. Pollution of Air and Water

8th Class Science Pollution of Air and Water Question Bank Pollution of Air and Water

  • question_answer
    ____ is a measure of the quantity of oxygen used by biological organisms to break down organic material present in a given water sample.

    A) Oxygen requirement

    B) Potable water

    C) Biochemical oxygen demand

    D) Physical oxygen demand

    E) Non e of these

    Correct Answer: C

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