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SAI INTERNATIONAL SCHOOL
                                                        PHYSICS
                                                        CLASS IX
                                              HOME ASSIGNMENT-21
               OBJECTIVE

               MCQ (BOARD)
               1. If the speed of an object is doubled then its kinetic energy is _______

               a.  doubled

               b.  tripled
               c.  quadrupled

               d.  halved

               2. The kinetic energy possessed by a body moving with a certain velocity is
               a.  Proportional to the height of the body.

               b.  The force, which helps it acquire a particular acceleration.

               c.  The work done on it to acquire that velocity.
               d.  Dependent on the change in shape of the body.

               3. A 1 kg mass has a kinetic energy of 1 joule when its speed is

               a.  0.45 m/s
               b.  1 m/s

               c.  1.4 m/s

               d.  4.4 m/s
               4. A force equal to the weight of the body is acting on it and stops it within a distance
               of

                    2
               a.  v /2.
               b.  2g/v .
                       2
                      2
               c.  g/v .
                    2
               d.  v /2g .
               5. If two balls of different masses have same kinetic energy, then
               a.  lighter ball has greater momentum than the heavier ball.

               b.  both the balls have equal momentum.

               c.  the heavier ball has greater momentum than the lighter ball.
               d.  both the balls have zero momentum.


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