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SAI INTERNATIONAL SCHOOL


                                                       CLASS-IV

                                                  SUBJECT - SCIENCE


                                     CHAPTER 12-WEATHER, AIR AND WATER

                                         SUB TOPIC-IMPURITIES  IN WATER

               1.  Fill in the blanks:
                    a.  _____________is  the simplest and most common method of purifying

                        water.
                    b.  ____________-is  added to tap water or other water sources as a gas or
                        as tablets.
                    c.  The process of passing impure water through filters is known as
                        ___________.



               2. Observe the picture and answer the following questions.





                   a)
                   b)
                   c)

                   d)
                   e)
                   f)

                   g)
                   h)
                   i)

                   a) Name the process shown in the above picture.

                    b) How to get clear water after the above process? Name that process.


                    c) Is the water safe to drink after pouring the clear water into another
               container? Give reasons for your answer.
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