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

7th Class Science Sample Paper Science Olympiad Model Test Paper-2

  • question_answer
    Which one of the following is a part of wastewater treatment plant?

    A) Clarifier

    B) Vertical bars

    C) Aeration tank

    D) All of these

    E) None of these

    Correct Answer: D

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