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SAI INTERNATIONAL SCHOOL

                                                       PHYSICS


                                                       CLASS IX

                                                  Chapter:SOUND


                                            HOME ASSIGNMENT-26




               OBJECTIVE
               MCQ (BOARD)



               1. The time period of a tuning fork of frequency 400 Hz is

               a.  0.0020 s


               b.  0.0025 s

               c.  0.0050 s


               d.  0.0250 s

               2. The speed of sound is more in solids than gases


                   a)  molecular interactions are stronger in solids than gases.
                   b)  sound wave is an electromagnetic wave.

                   c)  gases are bad conductors of heat.
                   d)  gas molecules are free to move in all directions.


               3. With increase in temperature, the speed of sound in air


               a.  decreases.

               b.  increases.


               c.  remains unaffected.

               d.  keeps fluctuating.





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