Page 1 - HA
P. 1

SAI INTERNATIONAL SCHOOL

                                                       PHYSICS


                                                       CLASS IX

                                                  Chapter:SOUND


                                            HOME ASSIGNMENT-27


               OBJECTIVE

               MCQ (BOARD)

               1. A common example of reflection of sound is

               a.  echo.
               b.  lightning.

               c.  thundering.

               d.  transmission of sound from one place to other.
               2. The minimum time gap between two sounds to be heard distinctly must be

               a.  1.0 s.

               b.  0.1 s.
               c.  0.5 s.

               d.  0.25 s.

               3. In case of reflection of sound, the angle of incidence is
               a.  greater than the angle of reflection.

               b.  less than the angle of reflection.

               c.  equal to the angle of reflection.
               d. double the angle of reflection

               4. The ceilings of concert halls and conference halls are made of

               a.  curved sound boards
               b.  plane sound boards

               c.  spiral-in sound boards

               d.  spiral-out sound boards




                                                              1
   1   2