1.  A hollow iron pipe is 21 cm long and its external diameter is 8 cm. If the thickness of the pipe is 1 cm and iron weighs 8 g/cm^{3}, then the weight of the pipe is: 


2.  A hall is 15 m long and 12 m broad. If the sum of the areas of the floor and the ceiling is equal to the sum of the areas of four walls, the volume of the hall is: 


3.  66 cubic centimetres of silver is drawn into a wire 1 mm in diameter. The length of the wire in metres will be: 


4.  A right triangle with sides 3 cm, 4 cm and 5 cm is rotated the side of 3 cm to form a cone. The volume of the cone so formed is: 


5.  In a shower, 5 cm of rain falls. The volume of water that falls on 1.5 hectares of ground is: 

