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Question

The radius or the distance to the centre of the earth is over _____ kilometres.
  1. 4000
  2. 6000
  3. 5000
  4. 7000

A
6000
B
7000
C
5000
D
4000
Solution
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As the Earth is slightly flattened, the Earth has two radii. One is Equatorial radius which is 6378 Kms and other one is Polar radius which is 6357 kms.
The correct answer is Option C

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