NTSE Stage 2 SAT 2015 Question Paper

Question : 51 of 100

Marks: +1, -0

A solid sphere is cut into identical pieces by three mutually perpendicular planes passing through its centre. Increase in total surface area of all the pieces with respect to the total surface area of the original sphere is

250%
175%
150%
125%

Validate

Solution:

Percent change in total surface area

=[{6\π\r^2}/{4\π\r^2}×100]%

=[3/2×100]%=150%

∴ Option (c) is correct.

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