11.When a bullet is fired from a gun
   (a) the gun moves forward
   (b) the gun jumps up
   (c) the gun does not move
   (d) the gun recoils with the same momentum as the bullet
Ans: (d)
12.Choose the scalar quantity from the following physical quantities
   (a) force
   (b) velocity
   (c) acceleration
   (d) speed
Ans: (d)
13.If you want to open a door with les difficulty you push it
   (a) at the middle
   (b) at a point away from the hinge (near the rim)
   (c) near the hinge
   (d) None of the above
Ans: (b)
14.A body has fallen from a height. Just before touching the pound it has
   (a) lost all its potential energy and gained an equivalent amount of kinetic
       energy
   (b) gained potential energy and lost kinetic energy
   (c) gained kinetic energy as well as potential energy
   (d) lost kinetic energy as well as potential energy
Ans: (a)
15.When a swing is drawn to a side Its potential energy In relation to the earth
   (a) increases
   (b) decreases
   (c) remains the same
   (d) is constant
Ans: (a)
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