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SAI International School
                                               Subject - Chemistry
                                                     Class - VIII
                                      Topic – Pollution of Air and water
                    Sub-Topic-Pollution of Air and WaterPurification of water and
                                         prevention of water pollution

                                            HOME ASSIGNMENT


          OBJECTIVE/MCQS

            1.   Common water filter contains candle made up of
                    a.  Wax.
                    b.  Resin.
                    c.  Porcelain.
                    d.  Clay.
            2.   Electric water filters contain candles made up of
                    a.  Resin.
                    b.  Wax.
                    c.  Porcelain.
                    d.  Clay.
            3.   The term potable in potable water means?
                    a.  Easy to carry.
                    b.  Safe for drinking.
                    c.  Unsafe for drinking.
                    d.  Easy to filter.
            4.   While brushing our teeth, we should
                    a.  Take water in a mug.
                    b.  Keep the water running from the tap.
                    c.  Brush under the shower.
                    d.  Brush in river.


               SUBJECTIVE

             Q. No.                                   Questions                                 Skill  Marks
               1.         Which radiation are used in electric water filters to kill all the      U       1
                          harmful micro-organisms present in tap water and make it safe
                          for drinking?

               2.         Drinking water can be made safe for drinking by adding which            U       1
                          tablets?

               3.         Choose the correct option from the following:                           U       1
                          (a) If both Assertion and Reason are correct and Reason is the
                          correct explanation of Assertion.
                          (b) If both Assertion and Reason are correct, but Reason is not
                          the correct explanation of Assertion.
                          (c) If Assertion is correct but Reason is incorrect.
                          (d) If Assertion is incorrect but Reason is correct.
                          (e) If Assertion & Reason both are incorrect.
                          Assertion (A): Boiling the water makes it suitable for drinking.
                          Reason (R): Boiling the water kills harmful micro-organisms
                          present in water..

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