Discussion :: UPSC Civil Service Exam Questions
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Which one of the following statements best defines a 'level surface'?
A.
A horizontal surface every element of which is normal to plumb line
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B.
A curved surface every element of which is perpendicular to the spheroidal shape of the earth
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C.
A plane surface which is perpendicular at all points to the direction of gravity
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D.
A curved surface which is perpendicular to the direction of gravity at every point
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