Page 1 - HA-2-Practice Worksheet
P. 1

SAI INTERNATIONAL SCHOOL
                                                      Class - VI
                                               Subject - Chemistry
                                          Topic – Changes Around Us
                      Sub-Topic –Application of Contraction and Expansion
                                                Practice Worksheet


         Q. No.                                   Questions                                      Mark    Skill

                  Choose  the correct option  from the  following for  Questions 1,  2
                  and 3:
                      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.
           1.     Assertion (A): A non-metallic rim is usually fitted to a wooden                  1       U
                  cartwheel.
                  Reason (R): It is done to have smooth movement and less wear and
                  tear of the wooden wheel.
           2.     Assertion (A): The formation of rust is a chemical change.                       1       U
                  Reason (R): Formation of rust on iron is due to exposure of iron to air
                  and water.
           3.     Assertion (A):Change of liquid water to steam, on boiling, is an                 1       U
                  irreversible change.
                  Reason (R):Beating of human heart is a non-periodic change.
           4.     If you pour a few drops of petrol on your palm, you will feel cool as it         1       K
                  evaporates. What happens during this change?
                      a)  Energy is released.
                      b)  Energy is absorbed.
                      c)  Chemical reaction takes place.
                      d)  Both (a) and (c).
           5.     Mohan  was  boiling  water  in  a  pan  for  making  tea.  His  brother  Ram     1       C
                  came there and observed that during boiling of water some bubbles are
                  formed. He told his brother Mohan that boiling of water is a chemical
                  change as gas is evolved in this process. But Mohan argued that this is
                  not  a  chemical  change.  Do  you  agree  with  Mohan?  What  kind  of
                  change is this?
           6.     Explain how, a metal rim is fixed around the wooden wheel of a cart.             3     U&A
                  What type of change/changes take place during this process?
           7.     Why are there gaps between sections of rails on the railway track?               3     U&A
           8.     Explain with an experiment how, dissolving of salt in water is a physical        3       A
                  change?
           9.         a)  Mention the common cause of physical and chemical changes.               5       C
                      b)  Why is liquid mercury used in clinical thermometer?                   (2+3)      A
          10.     Define the following terms:                                                      5       U
                  Expansion,  Contraction,  Physical  Change,  Chemical  Change,
                  Corrosion



                                                                                                         1
   1