2. Sample Papers
  3. 7th Class
  4. Science

7th Class Science Sample Paper Science Olympiad Model Test Paper-19

  • question_answer
    In waste water treatment plant useful products obtained are:

    A) Biogas

    B) Sludge

    C) Aerobic bacteria

    D) Both [a] and [b]

    E) None of these

    Correct Answer: D

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