7th Class Science Wastewater Story Question Bank Wastewater Story

  • question_answer DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 1 Sewage is a complex mixture containing suspended solids, organic and inorganic impurities, nutrients, saprotrophic and disease causing bacteria and other microbes. Consider the following waste present in sewage and answer the questions. (i) Animal waste (ii) Fruit and vegetable waste (iii) Nitrates (iv) Phosphates (v) Phosphorus (vi) Nitrogen The inorganic impurities are: -

    A)  (i) and (ii) only

    B)  (i), (ii), (iii) and (iv) only

    C)  (iii) to (vi)

    D)  (v) and (vi) only

    Correct Answer: C

    Solution :

     (iii) to (vi)


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