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SAI INTERNATIONAL SCHOOL

                                                       PHYSICS


                                                       CLASS IX

                                                  Chapter:SOUND


                                            HOME ASSIGNMENT-29

               OBJECTIVE

               MCQ (BOARD)

               1.The part of the ear that vibrates when sound wave just crosses the ear canal is

               a.  anvil.

               b.  stirrup.
               c.  ear drum.

               d.  Hammer

               2. The part of ear that collects and transmits the sound to the middle ear is
               a.  cochlea.

               b.  eardrum.

               c.  anvil.
               d.  Pinna

               3. Sound reaches our brain in the form of

               a.  electrical signals.
               b.  magnetic signals.

               c.  electromagnetic signals.

               d.  sound itself
               4. The outer ear is called

               a.  tympanic membrane.

               b.  pinna.
               c.  anvil.

               d.  stirrup






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