Page 61 - Science Class 06
P. 61

Michael Faraday                                       that if a magnet be moved through a coil of

              The basic principles of producing electricity         copper wire, it causes an electric current to
              were  discovered  by  one  of  the  greatest          flow  in  that  coil.  This  principle  is  called

              English  Scien sts  Michael  Faraday  (1791-          electromagne c induc on. Remember that
              1867). He discovered the principles in 1831           the  electric  generator  and  the  electric
                                                                    motor both work on this principle.




                Interchange     :     Able to change one’s form to acquire another form
                Particulate      :    Something that is made up of small particles
                Diffusion        :    Mixing of two substances naturally without stirring

                Conductivity   :      Capacity of a material to let heat and electricity pass through it
                Transparent    :      Feature of a material to let light pass through it


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                i Anything that is concrete,  occupies space and has definite shape is called matter.
                i Matter can exit in three different state— solid (hard state), liquid (fluid state) and gaseous
                    (air-like state).
                i The three states of matter are interchangeable into one another.
                i All matter is made up of small particles (grains).
                i Matter, i.e., material things possess some physical properties as under:
                    Ÿ  They can be soluble or insoluble in water.

                    Ÿ  They can be heavier or lighter than water.
                    Ÿ  They can be transparent or opaque.
                    Ÿ  They can diffuse together naturally or not.
                    Ÿ  They can be sensitive to magnets, i.e., magnetic or non-magnetic.

                    Ÿ  They can be good conductors, bad conductors or non-conductors of heat and electricity.



                                                         Exerciseerciseerciseerciseerciseercise
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                                                         Exercise
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              A.   Tick (3) the correct op on.
                  1.   The liquids that do not mix with each other are called:
                      (a)  insoluble                             (b)  immiscible
                      (c)  opaque                                (d)  transparent
                  2.   The materials that allow electricity to pass through them par ally are called:

                      (a)  non-conductors of electricity         (b)  poor (bad) conductors of electricity
                      (c)   good conductors of electricity       (d)  none of these



              Science-6                                                                                          61
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