Class IX

. 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
  1. . 12 cm3
  2. 15 cm3
  3. 16 cm3
  4. 20 cm3
In a shower, 5 cm of rain falls. The volume of water that falls on 1.5 hectares of ground is:
  1. . 75 cu. m
  2. 750 cu. m
  3. 7500 cu. m
  4. 75000 cu. m
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:
  1. 720
  2. 900
  3. 1200
  4. 1800
66 cubic centimetres of silver is drawn into a wire 1 mm in diameter. The length of the wire in metres will be:
  1. 84
  2. 90
  3. 168
  4. 336
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/cm3, then the weight of the pipe is
  1. 3.6 kg
  2. 3.696 kg
  3. . 36 kg
  4. 36.9 kg
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