Class IX

If the surface areas of of two spheres are in the ratio of 4 : 25, then the ratio of their volumes are
  1. 0.184027778
  2. 1.044444444
  3. 5.213888889
  4. 0.420138889
The radii of the ends of a bucket 12 cm high are 15 cm and 10 cm. The curved surface area of the bucket is 
  1. 325π cm²
  2. 325 cm²
  3. 320π cm²
  4. 320 cm²
The curved surface are of the cube is 1734 cm2 , then the length of the side of the cube is
  1. 17 cm
  2. 13 cm
  3. 15 cm
  4. 19 cm
Three solids cubes of sides 1 cm, 6 cm and 8 cm are melted to form a new cube. The surface are of the cube so formed is
  1. 486 cm²
  2. 488 cm²
  3. 489cm
  4. 490 cm²
The slant height of the a right circular cone of the height 15 cm and base diameter 16 cm is
  1. 11 cm
  2. 13 cm
  3. 15 cm
  4. 17 cm
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