7th Class Science Wastewater Story Question Bank Wastewater Story

  • question_answer DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 2 There are various steps involved in the treatment of polluted water before it can be made fit for human consumption. What is the first step involved in treatment of polluted water?

    A) Chlorination               

    B) Aeration

    C) Filtration                     

    D) None of these

    Correct Answer: B

    Solution :



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