Page 75 - Science Class 06
P. 75

D.   Match the following columns.
                      Column I                                        Column II
                  1.  Infla ng a balloon                          a.  irreversible
                  2.  Ripening of a crop                         b.  non-periodic change
                  3.  Movement of a pendulum                     c.  permanent change
                  4.  Occurrence of an eclipse                   d.  reversible change
                  5.  Burning of a rag                           e.  periodic change
              E.   Very short answer ques ons.

                  Write the name for.
                  1.  two substances that react in rus ng an iron  ______________          ______________
                  2.  two musts for every type of change              ______________       ______________
                  3.  two quali es of a physical change               ______________       ______________
                  4.  two quali es of a chemical change               ______________       ______________
                  5.  two changes beyond man’s control                ______________       ______________
                  6.  two changes that take place at random           ______________       ______________
              F.   Short answer ques ons.
                  1.   Discuss the two following sayings.
                      a.   Change is the law of nature.
                      b.   Change is the spice of life.
                  2.   Name the factors at the base of the classifica on of various types of changes. Define each
                      of them clearly?
                  3.   Bring out the main points of difference between a chemical change and physical change in
                      a tabular form?
                  4.   Which two things are must for a change? Write a short note on each.
                  5.   Is a physical change, temporary and reversible also? If yes, why?
                  6.   Is a chemical change, permanent and irreversible also? If yes, why?
              G.   Long answer ques ons.
                  1.   What do you mean by changes? Explain.
                  2.   Explain the classifica on of changes.
                  3.   Differen ate between desirable and undesirable changes in your own words.
                  4.   Explain the types of reactions.
                  5.   Explain absorp on or evolu on of energy.

             Project ActivityActivityActivity
             Project
             Project
             Project Activity
              A.  Write the correct type of the change.
                  1.  Flash of ligh ng      :  _______________        2.  Burning of petrol  :    _______________
                  3.  Mel ng of wax         :  _______________        4.  Dung to biogas    :    _______________
                  5.  Moon phases           :  _______________

              B.  Make a list of some reversible and irreversible changes from your surroundings.
                  1.  _____________             2.  _____________             3.  _____________
                  4.   _____________            5.   _____________            6.   _____________



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