1.
A hollow spherical metallic ball has an external diameter 6 cm and is $$\frac{1}{2}$$ cm thick. The volume of metal used in the ball is :

2.
If a hollow sphere of internal and external diameters 4 cm and 8 cm respectively is melted into a cylinder of base diameter 8 cm, then the height of the cylinder is :

3.
The ratio of the volume of a hemisphere and a cylinder circumscribing this hemisphere and having a common base is :

4.
The volume of a right circular cone which is obtained from a wooden cube of edge 4.2 dm wasting minimum amount of wood is :

5.
If the diameter of a sphere is 6 m, its hemisphere will have a volume of :

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