Class IX

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
The curved surface area of a cylindrical pillar is 264 m2 and its volume is 924 m3. Find the ratio of its diameter to its height.
  1. 3 : 7
  2. 7 : 3
  3. 6 : 7
  4. 7 : 6
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
A metallic sheet is of rectangular shape with dimensions 48 m x 36 m. From each of its corners, a square is cut off so as to make an open box. If the length of the square is 8 m, the volume of the box (in m3) is:
  1. 4830
  2. 5120
  3. 6420
  4. 8960
50 men took a dip in a water tank 40 m long and 20 m broad on a religious day. If the average displacement of water by a man is 4 m3, then the rise in the water level in the tank will be:
  1. 20 cm
  2. 25 cm
  3. 35 cm
  4. 50 cm
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