16.The sun continuously produces an enormous amount of energy. This is due
   (a) nuclear fission
   (b) nuclear fusion
   (c) chemical combustion
   (d) boiling
Ans: (b)
17.The unit of power in SI is
   (a) Joule
   (b) Newton
   (c) Joule/Sec
   (d) Erg/Sec
Ans: (c)
18.Where does the centre of gravity of a rubber ring lie?
   (a) on the outer surface
   (b) in the inner surface
   (c) at the centre of the ring
   (d) None of the above
Ans: (c)
19.If an empty cylinder Is half ruled with a liquid, Its centre of gravity is
   (a) shifted upwards
   (b) shifted downwards
   (c) shifted neither upward nor downward
   (d) shifted upward or downward depending on the density of the liquid
Ans: (b)
20.Who discovered that the Cree Call acceleration is the same for any object at
   a given place?
   (a) Newton
   (b) Pascal
   (c) Archimedes
   (d) Galileo
Ans: (d)