Class IX

If each edge of a cube is increased by 50% then the percentage increase in its surface area is
  1. 0.5
  2. 1
  3. 1.25
  4. 1.5
The edge of the cuboid are in the ratio 1 : 2 : 3 and its surface area is 88 cm2 . Then the volume of the cuboid is
  1. 24 cm³
  2. 48 cm³
  3. 64 cm³
  4. 120 cm³
The volume of a sphere of radius r is obtained by multiplying its surface area by
  1. 1.333333333
  2. r/3
  3. 4r/3
  4. 3r
The cost of the paint is Rs. 36.50 per kg. If 1 kg of paint covers 16 square feet, then the cost to paint outside of a cube having 8 feet each side is
  1. Rs. 692
  2. Rs. 768
  3. Rs. 876
  4. Rs. 972
A hemispherical tank is made up of an iron sheet 1 cm thick. If the inner radius is 1 m, then the volume of the iron used to make the tank is
  1. 0.06343 m³
  2. 1.06343 m³
  3. 1.06343 m³ 0.06686 m³
  4. none of these
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