7th Class Science Wastewater Story Question Bank Wastewater Story

  • question_answer

    DIRECTION: ¬†Carefully observe pictures given below and answer the following questions.     Look at the above diagram of sewage treatment plant and answer the questions that follow.  

    What is the use of skimmer?

    A) It removes sand

    B) It removes oil and grease

    C) It helps in settling solid wastes

    D) It is used as a filter

    Correct Answer: B

    Solution :

    It removes oil and grease

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