Multiple choice question — task. Mathematics State Board, Class 10.

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1. If two solid hemispheres of same base radius '\(r\)' units are joined together along their bases, then curved surface area of this new solid is:

\(2 \pi r^2\) \(sq. units\)
\(3 \pi r^2\) \(sq. units\)
\(8 \pi r^2\) \(sq. units\)
\(4 \pi r^2\) \(sq. units\)

2. The total surface area of a hemi-sphere is how much times the square of its radius.

\(2 \pi\)
\(3 \pi\)
\(4 \pi\)
\(\pi\)

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