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
A boat having a length 3 m and breadth 2 m is floating on a lake. The boat sinks by 1 cm when a man gets on it. The mass of the man is:
  1. 12 kg
  2. 60 kg
  3. 72 kg
  4. 96 kg
The slant height of a right circular cone is 10 m and its height is 8 m. Find the area of its curved surface.
  1. 30 m2
  2. 40 m2
  3. 60 m2
  4. 80 m2
A cistern of capacity 8000 litres measures externally 3.3 m by 2.6 m by 1.1 m and its walls are 5 cm thick. The thickness of the bottom is:
  1. 90 cm
  2. . 1 dm
  3. 1 m
  4. D. 1.1 cm
How many bricks, each measuring 25 cm x 11.25 cm x 6 cm, will be needed to build a wall of 8 m x 6 m x 22.5 cm?
  1. 5600
  2. . 6000
  3. 6400
  4. D. 7200
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