42.
Which conservation principle is applicable in the case of the motion of a rocket?

43.
Rocket works on the principle of

44.
A passenger standing in a bus is thrown outward when the bus takes a sudden turn. This happens due to

45.
When a running car stops suddenly, the passengers tends to lean forward because of:

46.
A man stands in a lift which accelerates upwards. The resultant reaction force on the floor of the lift is

47.
Who defined the law of gravitation ?

48.
It is difficult to fix a nail on a freely suspended wooden frame. Which law supports this statement?

49.
In the Earth, the weight of a body is maximum at the

50.
A person is hurt on kicking a stone due to