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Page 68 - CT&AI_CLasa_7_Part_1
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    Based    on   these   observations,   which       8.  A student observes:
                         conclusion is most appropriate?                      •  Iron nail: hard, lustrous, sonorous
                                                (Pattern Recognition)
                                                                              •  Coal: dull, brittle, non-sonorous
                                (a)   The material  is  a non-metal           •   Wood: hard, poor conductor of heat and
                                   because it is shiny.                         electricity

                                (b)   The material is a metal because it        To classify a material, which steps should be
                                   shows multiple metallic properties.        followed?                  (Decomposition)
                                                                                    (a)   Check only one property
                                (c)   The material is wood because it is
                                   hard.                                            (b)   Check multiple properties like

                                (d)   The  material  is plastic because  it            lustre, hardness, conductivity
                                   allows electricity to pass through it.
                                                                                    (c)   Guess randomly
                      6.  Observe the pattern:
                         Iron    gets  coated  with a reddish-brown                 (d)   Check only the colour of the
                         flaky substance                                               material
                         Copper   forms a green coating
                         Silver   turns black when exposed to air for a     9.  A student performs an experiment to find out
                         long time                                            the conditions required for the rusting of iron
                                                                              using three jars, as shown in the diagram:
                         What is the underlying concept?
                                                (Pattern Recognition)
                                (a)   Only metals that contain iron
                                                                                       A              Thread
                                   show corrosion.

                                (b)   All metals react in exactly the                                Iron nail
                                   same way with air.                                                Silica gel

                                (c)   Metals react with environment                    Jar A
                                   causing corrosion.

                                (d)   All types of non-metals corrode.                  B             Thread

                      7.  A student wants to  identify  whether a                                     Oil
                         material is a metal. Which set of steps best                                 Iron nail
                         decomposes this task?      (Decomposition)                                   Water
                                (a)   Check colour    Check cost                        Jar B
                                   Check size

                                (b)  Check lustre   Test conductivity
                                   Test malleability                                     C             Thread

                                (c)   Check  weight    Check  shape                                    Iron nail
                                   Check texture
                                                                                                       Water
                                (d)   Heat the material  Observe softness
                                      Check the change in state                        Jar C

                     66        Computational Thinking-7 (Science)

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