Solar System Questions and Answers – Part 5

This is the Part 5 general knowledge questions and answers section on “Solar System” with explanation for various interview, competitive examination and entrance test. Solved examples with detailed answer description, explanation are given and it would be easy to understand.

41. How old is the Earth?
The Earth is 4600 million years old.

42. What is geocentric theory?
According to this theory, the Earth is the unmoving centre of the universe.

43. Who propounded the Helicentric theory?
Copernicus in 1543.

44. What is Helicentric theory?
Sun is the centre of sthe Universe and that the Earth and all other planets revolve around it.

45. Who first assessed the mass of the Earth?
Dr.Nivil Maskelyne(Scotland) in 1764.

46. Into how many layers is the outer surface of the Earth divided?
Into four.
(1) Lithosphere
(2) Hydrosphere
(3) Atmosphere
(4) Biosphere.

47. What is Lithosphere?
Lithosphere means the entire top crust of the Earth which includes not only the land surface but also the ocean floor.

48. What is Hydrosphere?
Hydrosphere is the water surface which includes the ocean, lakes and rivers. It list on the lithosphere.

49. What is Atmosphere?
Atmosphere is the blanket of air that envelops the Earth. It covers both the land and water surface.

50. What is Biosphere?
Biosphere is the sphere of life which spreads over all three other spheres-lithosphere, hydrosphere and atmosphere.

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