51.
The Law of Kepler is related with which among the following ?

52.
The term ''equinox' means

53.
If the earth suddenly stop rotating, the value of "g" will be

54.
If an empty cylinder is half filled with a liquid, its center of gravity is

55.
Temperature of distant luminous bodies can be determined by

56.
The three famous law of Kepler is related to

57.
In Astrophysics, what name is given to a hypothetical hole in outer space from which stars and energy emerge?

58.
If there were no gravity, which of the following will not be there for a fluid?

60.
The term ''Isoneph' indicates the lines of equal