Surface Areas and Volumes Test - 3

The radius of a hemispherical balloon increases from 6 cm to 12 cm as air is being pumped into it. The ratios of the surface areas of the balloon in the two cases is

The radii of two cylinders are in the ratio 2 : 3 and their heights are in the ratio of 5 : 3. The ratio of their volume is

The number of planks of dimensions (4 m × 5 m × 2 m) that can be stood in a pit which is 40 m long, 12 m wide and 160 m deep is

The edge of a cube is 20 cm. How many small cubes of 5 cm edge can be formed from this cube?

Volume of a hemisphere is 19404 cm³. The total surface area is

A spherical lead of radius 8 cm is melted and small lead balls of radius 16 mm are made. The total number of possible small lead balls is

The curved surface area of a right circular cylinder of height 14 cm is 88 cm2. The diameter of the base of the cylinder is

The capacity in litres of a conical vessel with radius 7 cm and slant height 25 cm is