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SAI INTERNATIONAL SCHOOL
                                                      Class - VI
                                               Subject - Chemistry
                                              Topic – Air around Us
                                           Sub-Topic – Oxygen Cycle
                                                Home Assignment


               Objective Questions

            1.     Global warming is caused due to excess amount of  whch of the following                C
                  gas?
                      a)  Carbon dioxide
                      b)  Water vapour
                      c)  Oxygen
                      d)  Nitrogen


            2.     The gas needed for respiration  is                                                     C
                       a)  Carbon dioxide
                       b)  Water vapour
                       c)  Oxygen
                       d)  Nitrogen

            3.     The gas present in four-fifth of total volume of air is                                C
                      a)  Carbon dioxide
                      b)  Water vapour
                      c)  Oxygen
                      d)  Nitrogen

            4.     Which one of the following is incorrect?                                               U
                      a)  Oxygen is consumed by plants day and night.
                      b)  Carbon dioxide is consumed by animals at night.
                      c)  Carbon dioxide is needed for plants during day time.
                      d)  Animals release carbon dioxide day and night.
            5.    The amount of oxygen in air is                                                          C
                      a)  One-half
                      b)  One-fifth
                      c)  One-fourth
                      d)  One-third


               Subjective Questions

         Q. No.                                  Questions                                    Marks      Skill
        Q. 1      What could be the possible causes  of global warming?                          1         U
        Q. 2      DIRECTION: Each of these questions contains an Assertion                       1         U
                  followed by Reason. Read them carefully and answer the question
                  on the basis of following options. You have to select the one that
                  best describes the two statements.
                  (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.


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