OCEANS AND COUNTRIES
INDIAN TRANSPORTATION COMMUNICATION NATIONAL PARKS AND SANCTUARIES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A sphere
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An oblate spheroid
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A prolate spheriod
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Tetrahedron
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Detailed explanation-1: -The oblate spheroid, or oblate ellipsoid, is an ellipsoid of revolution obtained by rotating an ellipse about its shorter axis . It is the regular geometric shape that most nearly approximates the shape of the Earth . A spheroid describing the figure of the Earth or other celestial body is called a reference ellipsoid.
Detailed explanation-2: -For the purposes of gravity reduction, the Earth is treated as a rotating oblate spheroid having an equatorial radius of a = 6378.137 km and a flattening of f = 1/298.257, where flattening is the difference between the equatorial and polar radii divided by the equatorial radius.
Detailed explanation-3: -“Earth is not a perfect sphere. Its shape is an oblate spheroid. This just means that it flattens at the poles and widens out at the equator.” Earth bulges at the equator because of the centrifugal force during rotation.
Detailed explanation-4: -Earth is an oblate spheroid. This means it is spherical in shape, but not perfectly round. It is slightly bulged at the equator and is flattened at the poles.