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SAI International School

                                              Subject - Chemistry
                                                    Class - VIII

                                   Topic – Pollution of Air and Water
                                             Practice Worksheet



           Q. No.                                Questions                                 Skill    Marks
               1.    The constituent of polluted air which contributes to producing        U        1
                      acid rain is
                                a.  Nitrogen.
                                b.  Sulphur dioxide.
                                c.  Oxygen.
                                d.  Hydrogen.
               2.    What do you mean by eutrophication?                                   U        1
              3.      What do you mean by potable water?                                   .        1
              4.      Choose the correct option from the following:                        U + A    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):Greenhouse gas cause air pollution.
                      Reason (R): Greenhouse gas is necessary for survival.
              5.      Assertion (A): Hydrogen helps in air pollution.                      U + A    1
                      Reason (R): Oxygen is the most harmful greenhouse gas.
              6.      What is a water pollutant?                                           U        1
              7.      What do you mean by global warming?                                  U        1
              8.      Mention three effects of air pollution.                              R + A    3
              9.      Write down three sources of water pollution.                         U + R    3
             10.      Write down five ways of how to conserve water pollution.             R + U    5
                                                                                           + A





























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