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SAI INTERNATIONAL SCHOOL
                                                         Class 8
                                                  Home Assignment
                                                   Subject-Physics
                                                       CH-Sound
                                       Subtopic-Characteristics of sound


                   1.    Loudness, pitch and______ are three characteristics of sound.                        1
                   2.    __________ and ____________ sound are inaudible.                                     1
               True/false
                   3.    20 Hz- 20000 Hz sound is inaudible.                                                  1
                   4.    Pitch of the voice of a child is higher than that of a boy.                          1
                   5.    High pitch of sound has a high frequency.                                            1
               MCQ
                   6.    Human ear cannot hear those mechanical waves whose frequency lies in the             1
                         frequency range
                            a) less than 100 Hz but greater than 10000 Hz.
                            b) between 1000 Hz and 5000 Hz.
                            c) between 500 Hz and 20000 Hz.
                            d) less than 20 Hz and more than 20000 Hz.
                   7.    If you go on increasing the stretching force on a wire in a guitar, its              1
                         frequency
                            a) increases.
                            b) decreases.
                            c) remains unchanged.
                            d) none of these.
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