Page 1 - HOME ASSIGNMENT-2(PRACTICE WS)
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SAI International School
                                                  Subject-Chemistry

                                          Ch-Matter in our surroundings
                Topic- Factors affecting States of matter, Effect of pressure on States
                                              of matter & Evaporation

                                                     Worksheet: 2
               MCQs
               Q.1 During summer days, water is kept in an earthen pot becomes cool because of:
               a) diffusion                                       c) sublimation
               b) transpiration                                   d) evaporation.
               Q.2 Which of the following factors are responsible for the change of state of dry ice
               when exposed to air?
               a) increase in pressure                            c) decrease in pressure
               b) increase in temperature                         d) decrease in temperature
               Q.3 When heat is constantly by a gas burner to boiling water, then the temperature of
               water during vapourisation :
               a) rises very slowly                               c) first rise then becomes constant
               b) rises rapidly until steam is    produced        d) does not rise at all.

                DIRECTION:Each of these questions contains an Assertion 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.
                (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.
         Q.4. Assertion: Ice is better for cooling than ice cold water
         Reason: Ice has a higher latent heat of fusion.

         Q.5. Assertion: We feel cold when we pour little amount of spirit on our hand.
         Reason: Evaporation causes cooling.
         Q.6 What type of clothes should we wear during summer? Why?
         Q.7 Explain why there is no change in temperature during boiling of water.
         Q.8 How does perspiration or sweating help to keep our body cool on a hot summer day?
         Q.9 Rajesh took three beakers filled with water and kept them at three different places. First beaker
         under fan, second beaker in the cup board and the third beaker in the refrigerator. From which
         beaker the water will evaporate faster? Give reasons for his observations.
         Q.10.Sudha took two ice cubes and placed a thread inside and pressed them. She found that both
         the ice cubes were joined to form a single one with the thread inside. Explain her observations.
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