If the volume and surface area of a sphere are numerically the same, then its radius is :

A copper wire of length 36 m and diameter 2 mm is melted to form a sphere. The radius of the sphere (in cm) is :

The capacities of two hemispherical vessels are 6.4 litres and 21.6 litres. The areas of inner curved surfaces of the vessels will be in the ratio of :

The base of a pyramid is an equilateral triangle of side 1 m. If the height of the pyramid is 4 metres, then the volume is :

Each side of a cube is decreased by 25%. Find the ratio of the volume of the original cube and the resulting cube = ?

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