Page 1 - CBW Light Shadows & Reflections
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SAI INTERNATIONAL SCHOOL


                                                     Class 6
                                   Competency Based Worksheet

                                             Subject- Physics

                               Ch. – Light Shadows and Reflection

           For Assertion& Reason question follow the following directions.
           (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: Shadows are sharp when the light source is small or point-like.
                    Reason: A small source of light creates well-defined shadows.

               2.    Assertion: Light can travel through a vacuum.
                    Reason: Light needs a medium to propagate.

               3.    Which of the following materials would form the clearest shadow?
                        a)  Butter paper
                        b)  Cellophane paper
                        c)  Plastic sheet
                        d)  Thin wooden plank

               4.    In a pinhole camera, the image formed is:
                        a)  Erect and magnified
                        b)  Inverted and smaller
                        c)  Inverted and real
                        d)  Virtual and erect

               5.    If an object is moved away from a light source, its shadow becomes:
                        a)  Larger and fainter
                        b)  Smaller and sharper
                        c)  Larger and sharper
                        d)  Smaller and fainter

               6.    Which surface reflects light most efficiently?
                         A.                     B.                       C.                     D.










                        a)  Rough wall
                        b)  Polished mirror
                        c)  Black cloth
                        d)  Cellophane paper
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