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                                          SAI INTERNATIONAL SCHOOL

                                            DEPT OF SOCIAL SCIENCE

                                                SUB: _GEOGRAPHY

                                                      CLASS:_VII

               Ch No. 4

               Ch Name:AIR                                                                           FM. 25
               WORK SHEET NO. 1

           Sl.     Questions                                                                              Marks

           No
               1.  Hydrogen is the lightest gas. True/False                                               1
                   True
               2.   Combustion cannot take place without                                                  1
                    a)water
                    b)carbon
                    c)air
                    d)zinc


               3.  Other than nitrogen and oxygen, the composition of the rest of the gases is            1
                   about
                   a)4%
                   b)3%
                   c)2%
                   d)1%


               4.  Chose the correct statement-                                                           1
                    a)global warming because of increasing carbon dioxide
                    b) Our earth is surrounded by a huge blanket of air called lithosphere.
                    c) Green plants produce oxygen during combustion.
                    d) Humans or animals release oxygen.


               5.  Which gas is known as green house gas?                                                 1


               6.  What is atmpsphere?                                                                    1


               7.  Draw a diagram showing composition of air.What is global warming?                      3
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