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SAI International School
                                                      Class VII
                                                Home Assignment
                                                 Subject: Physics
                                   Ch- Electric current and simple circuit
                                             Subtopic: Electric Bell

           Any one option is correct.                                                                    Marks
             1.    Which of the following is not the component of electric bell?                             1
                     a)  Metallic gong
                     b)  Contact screw
                     c)  Bar magnet
                     d)  Soft iron armature
             2.    What is the function of contact screw in electric bell?                                   1
                     a)  To make contact with battery.
                     b)  To connect soft iron armature through spring to the power supply.
                     c)  To make the ringing sounds.
                     d)  All of the above
             3.    What is the shape of Electromagnet in electric bell?                                      1
                     a)  U-shaped
                     b)  Ring shaped
                     c)  Oval shaped
                     d)  Bar shaped
             4.    Which of the following doesn’t uses magnetic property of electric current?                1
                     a)  MRI scanners
                     b)  Maglev train
                     c)  Motors
                     d)  Geyser
             5.    In junkyards, electromagnet are used to                                                   1
                     a)  To lift the heavy Metal scraps.
                     b)  To separate metallic waste from non-Metallic waste.
                     c)  To move heavy metallic parts of vehicles.
                     d)  All of the above
          Subjective Questions:
             6.    List four components of Electric bell.                                                2

             7.    Write three uses of electromagnet.                                                    3
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