Question Bank - General Aptitude

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A sphere has a surface area of 400 ? mm2. What is the diameter?

A.
10 mm
B.
20 mm
C.
5 mm
D.
100 mm

Solution:

Calculation:Let r be the radius of sphere.Surface area of sphere = 4?r2Volume of sphere = 4?r3/3Then, 400 ? = 4?r2Therefore, r = 10 mmSo, D = 2r = 20 mm

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