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  3. 7th Class
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7th Class Science Sample Paper Science Olympiad Model Test Paper-18

  • question_answer
    During the waste water treatment, water is first passed through vertical bars, followed by settling tanks. It is known as______.                  

    A) Clarifier

    B) Grit chamber                              

    C) Aeration tank

    D) All of these

    E) None of these

    Correct Answer: E

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