Class IX

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
A cistern 6m long and 4 m wide contains water up to a depth of 1 m 25 cm. The total area of the wet surface is:
  1. 49 m2
  2. 50 m2
  3. 53.5 m2
  4. 55 m2
A large cube is formed from the material obtained by melting three smaller cubes of 3, 4 and 5 cm side. What is the ratio of the total surface areas of the smaller cubes and the large cube?
  1. 2 : 1
  2. 3 : 2
  3. 25 : 18
  4. 27 : 20
What is the total surface area of a right circular cone of height 14 cm and base radius 7 cm?
  1. 344.35 cm2
  2. 462 cm2
  3. 498.35 cm2
  4. None of these
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
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