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Railways Sample Paper RRBs Assistant Loco Pilot and Technician CBT STAGE-I Sample Paper-18

  • question_answer
    Which of the following indications of the health of a water body is the most widely accepted means of measuring how polluting an effluent is?

    A)  COD (chemical oxygen demand)

    B)  BOD (biological oxygen demand)

    C)  chloroform content

    D)  None of the above

    Correct Answer: B

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