Statements about how g changes with height and depth

1. A.
   Statement I is incorrect but statement II is correct
2. B.
   Both statement I and statement II are incorrect
3. C.
   Statement I is correct but statement II is incorrect
4. D.
   Both Statement I and II are correct.

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1. A.
   Acceleration due to gravity decreases as we go up or down from earth's surface.
2. B.
   Acceleration due to gravity is same at a height 'h' and depth 'd' from earth's surface, if $h = d$.
3. C.
   Acceleration due to gravity at 640 km above the earth surface decreases by 10% of its value at earth's surface (earth's radius is 6400 km)
4. D.
   There is reduction in acceleration due to gravity at poles due to rotation of earth as the poles are lying on the axis of rotation and do not revolve.

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