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HCS (Haryana)Prelims2019General Studies
Question
How many million square kilometres is the surface area of the earth?
Options
- A Approximately 550 million square kilometres
- B Approximately 520 million square kilometres
- C Approximately 510 million square kilometres
- D Approximately 500 million square kilometres
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Correct Answer
C Approximately 510 million square kilometres
Model Answer
- Calculation of the Surface area of the earth :
- The radius of the earth is 6371 km.
- Assuming the shape of the earth as a sphere, the surface area of a sphere is as follows-
- 4 pie R² = 4 × 3.14 (6371)² =approximately 510 million sq.km