Then the curved surface of this new solid is

If two solid hemispheres of same base radius r are joined together along with their bases, then the curved surface of this new solid is
(a) 4πr²
(b) 6πr²
(c) 3πr²
(d) 8πr²

Solution:

Radius of two solid hemispheres = r
These are joined together along with the bases
Curved surface area = 2π² × 2 = 4πr² (a)

During the conversion of a solid from one shape to another, the volume of the new shape will
(a) increase
(b) decrease
(c) remain unaltered
(d) be doubled

Solution:

During the conversion of a solid into another,
the volume of the new shaper will be the same.
i.e. remain unaltered (c)

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