16.  Water boils at low temperature on mountains because-

17.  What is the principle of Hydraulic Machines?

18.  What is the working principle of Rocket?

19.  Why the rain drops acquired the spherical shape?

20.  Energy stored in a spring in watch -

21.  For a missile Launched with A velocity Less than the escape velocity of earth, the total energy is

22.  A cycle type bursts suddenly. This represent an -

23.  The apparent weight of a man in a lift is less than the real weight then

24.  A person is Hurt on Kicking stone due to -

25.  In Radio Communication, the signals emitted by transmitting antenna are reflected on

26.  Lubricant oil is used in vehicle to -

27.  The purpose of choke in a fluorescent lamp is -

28.  Which atmospheric Layer is used for the transmission of radio waves?

29.  Flywheel is an important part of a steam engine because

30.  A body in uniform motion with uniform speed-