Basic HTML Version

|  | Table of Contents |  | View Full Version

Page 89 - CT&AI_CLasa_7_Part_1
P. 89

    Light: Shadows and

                                    11                                              Reflections

                                               computational thinking quest

                    Tick ( ) the correct option.
                      1.  A student looks through a clean glass window              (d)   reflective,  acting  like  a  mirror to
                         at  a tree  outside.  The image  appears  clear               show the inside of the room.
                         and  undistorted.  Which  property  of glass      3.  A teacher places a tracing paper and a glass
                         explains this?           (Abstract Thinking)         sheet  in front of a torch beam  separately.

                                                                              Students  observe  the  difference. Which
                                                                              observation is correct?  (Pattern recognition)

                                                                                    (a)   Both tracing paper and glass sheet
                                                                                       allow equal passage of light.
                                                                                    (b)   Glass sheet allows clear passage of
                                                                                       light, tracing paper diffuses it.
                                (a)  It absorbs all light rays.
                                                                                   (c)  Tracing   paper    blocks    light
                                (b)  It reflects most of the light rays.               completely,  while glass sheet

                                (c)   It allows most light to pass through             bends it randomly.
                                   without scattering.                              (d)   Neither  material  allows light  to

                                (d)   It bends light randomly.                         pass.
                                                                           4.  Why  do  doctors  use  X-ray imaging  instead
                      2.  A person hangs a thin  white  linen curtain         of ordinary torchlight to see bones inside the
                         over a window. They can see that it is bright        body?                      (Decomposition)
                         outside,  but  they  cannot  see  the  specific
                         shapes of the cars parked on the street. This              (a)   Bones  are  transparent  to  X-rays
                         is because the curtain is  (Abstract Thinking)                but opaque to visible light.

                                (a)   transparent, allowing all light to            (b)   Bones  are opaque to X-rays,
                                   pass through directly
                                                                                       forming internal shadows on film.
                                (b)   opaque, blocking all light from
                                   entering the room                               (c)  Torchlight   produces     clearer
                                (c)   translucent, passing some  light                 shadows than X-rays.

                                   through but scattering it in different           (d)   X-rays bend around bones to form
                                   directions                                          images.

                                                                                     Light: Shadows and Reflections   87

| 84 85 86 87 88 89 90 91 92 93 94 |