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 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 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
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
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