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SAI INTERNATIONAL SCHOOL
                                                      CLASS-VII

                                            SUBJECT - CHEMISTRY
                                TOPIC- MANAGEMENT OF WASTE WATER
                                SUB TOPIC- WASTE WATER TREATMENT


                                                    HOME ASSIGNMENT

               OBJECTIVE


               MCQs


                 Sl.                              Questions                                Mark        Skill
                 No.
                 Q.1  Which of the following is a step involved in secondary               1           R
                       treatment of wastewater?
                              a)  Decomposition of sewage
                              b)  Grit removal
                              c)   Sedimentation
                              d)  Chemical treatment


                 Q.2                                                                       01          u
                       The substance required to disinfecting wastewater is

                           a)  Chlorine
                           b)  Bromine
                           c)  UV rays

                       Bath a) and c)



                 Q.3  The name of the tank where decomposition of sewage is                1           U
                       done

                           a)  Sedimentation tank
                           b)  Chlorination tank
                           c)  Aeration tank
                       Screening tank

                 Q.4  Bio gas is produced in the following process                         1           U

                           a)  Digestion
                           b)  Circulation
                           c)  Excretion
                           d)  Respiration







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