31.  Which property of object is responsible for the electric force ?

32.  Which property of object is responsible for the Gravitational force.

33.  How much times is the strong nuclear force stronger then weak nuclear force ?

34.  How much times is the strong nuclear force stronger then electromagnetic force ?

35.  How much times is the electromagnetic force stronger then Gravitational force

36.  Who has unified electromagnetism and optics ?

37.  Who has unified terrestrial and celestial domains under a common law of Gravitational

38.  The weak nuclear force, Gravitational force and electromagnetic force are A, B and C Respectively then ________

39.  Range of weak nuclear force is ________

40.  Strong nuclear force close not exist on ________