16.  Water boils at low temperature on mountains because-

Answer & Explanation
Atmospheric pressure is less at mountains.

17.  What is the principle of Hydraulic Machines?

Answer & Explanation
Pascal

18.  What is the working principle of Rocket?

Answer & Explanation
Newton's 3rd Law

19.  Why the rain drops acquired the spherical shape?

Answer & Explanation
Surface tension

20.  Energy stored in a spring in watch -

Answer & Explanation
Potential Energy

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

Answer & Explanation
Negative

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

Answer & Explanation
Isothermal Process

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

Answer & Explanation
When the lift is going down with acceleration.

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

Answer & Explanation
Reaction

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

Answer & Explanation
Ionosphere

26.  Lubricant oil is used in vehicle to -

Answer & Explanation
to decrease the friction

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

Answer & Explanation
to decrease the flow of current

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

Answer & Explanation
Ionosphere

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

Answer & Explanation
helps the engine in keeping speed uniform.

30.  A body in uniform motion with uniform speed-

Answer & Explanation
May have uniform velocity