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QA. Objective type questions 
         Choose the correct option.


    Q1. Which one of these is a mechanical process of treating wastewater ?

           (a) Screening of wastes                             (b) Digestion of wastes

           (c) Disinfecting water                               (d) None of these

    Q2. Which of the following removes the largest impurities of sewage ?

           (a) Vertical bars                                         (b) Grit chamber 

           (c) Aeration tanks                                      (d) Sedimentation tanks

    Q3. Which one of these refers to the material that settles at the bottom in wastewater treatment ?

            (a) Sludge                                                  (b) Scum

            (c) Sewage                                                 (d) None of these

    Q4. In which one of these is air blown onto the sewage ?

            (a) Grit chambers                                        (b) Aeration tanks

            (c) water tank                                              (d) Septic tank

    Q5. Improper management of sewage results in 

            (a) diseases                                                  (b) contamination of water supply

            (c) water pollution                                       (d) all of these 
 
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