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SAI INTERNATIONAL SCHOOL

                                                       PHYSICS


                                                       CLASS IX

                                                  Chapter:SOUND


                                            HOME ASSIGNMENT-28

               OBJECTIVE

               MCQ (BOARD)

               1.  Before the main shock waves, the earthquake produces the characteristic sound
               waves which some animals like rhinoceros can hear. Can you guess the kind of sound

               waves produced here?


               (a) Infrasonic sounds



               (b) Ultrasonic sounds


               (c) Audible Sounds


               (d) None of these



               2. The bats can fly in the darkness of night without colliding with the other objects by

               emitting special sounds while flying. Which characteristic of sound is used by the bats to
               navigate?



               (a) Ultrasound


               (b) Infrasound



               (c) Audible sound


               (d) None of these








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