The cross-section of a piece of metal 4 m in length is shown below. Calculate :

(i) the area of the cross-section;

(ii) the volume of the piece of metal in cubic centimetres.

If 1 cubic centimetre of the metal weighs 6.6 g, calculate the weight of the piece of metal to the nearest kg.

A rectangular water-tank measuring 80 cm x 60 cm x 60 cm is filled from a pipe of cross-sectional area 1.5 cm², the water emerging at 3.2 m/s. How long does it take to fill the tank?

If the total surface area of a cube is 96 cm², then the volume of cube is

1. 8 cm³

2. 512 cm³

3. 64 cm³

4. 27 cm³

If a solid cube of side 16 cm is cut into eight identical cubes. The side of each cube is:

1. 2 cm

2. 4 cm

3. 6 cm

4. 8 cm