A) If from a solid cubic block a hemi-sphere of maximum diameter is cut-off then surface area of the cubic block is decrease.
B) If two sphere are melted to form a cylinder then surface area of cylinder is the sum of surface area of two sphere.
C) if a wire is wound about a cylinder so as to cover the whole surface, then length of the wire is equal to the surface area of the cylinder.
D) All of these.
Correct Answer: B
Solution :Not Available
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