volume-and-surface-area aptitude question and answers -Page 62

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Volume and Surface Area problems

1. A right circular cylinder is formed. A = sum of total surface area and the area of the two bases. B = the curved surface area of this cylinder. If A : B = 3 : 2 and the volume of cylinder is 4312 cm3, then what is the sum of area (in cm2) of the two bases of this cylinder?
Options
A. 154
B. 308
C. 462
D. 616

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2. A solid sphere has a radius 21 cm. It is melted to form a cube. 20% material is wasted in this process. The cube is melted to form hemisphere. In this process 20% material is wasted. The hemisphere is melted to form two spheres of equal radius. 20% material was also wasted in this process. What is the radius (in cm) of each new sphere?
Options
A. 4.2 (23)
B. 2.1 23
C. 2.1 43
D. 4.2 43

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3. A cuboid has dimensions 8 cm x 10 cm x 12 cm. It is cut into small cubes of side 2 cm. What is the percentage increase in the total surface area?
Options
A. 286.2
B. 314.32
C. 250.64
D. 386.5

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4. PQRS is a square whose side is 16 cm. What is the value of the side (in cm) of the largest regular octagon that can be cut from the given square?
Options
A. 8 ? 4?2
B. 16 + 8?2
C. 16?2 ? ?16
D. 16 ? 8?2

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5. A prism has a regular hexagonal base with side 6 cm. If the total surface area of prism is 216?3 cm2, then what is the height (in cm) of prism?
Options
A. 3?3
B. 6?3
C. 6
D. 3

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6. A right circular cylinder has height as 18 cm and radius as 7 cm. The cylinder is cut in three equal parts (by 2 cuts parallel to base). What is the percentage increase in total surface area?
Options
A. 62
B. 56
C. 48
D. 52

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7. The ratio of curved surface area and volume of a cylinder is 1 : 7. The ratio of total surface area and volume is 187 : 770. What is the respective ratio of its base radius and height?
Options
A. 5 : 8
B. 4 : 9
C. 3 : 7
D. 7 : 10

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8. The ratio of total surface area and volume of a sphere is 1 : 7. This sphere is melted to form small spheres of equal size. The radius of each small sphere is 1/6th the radius of the large sphere. What is the sum (in cm2) of curved surface areas of all small spheres?
Options
A. 31276
B. 36194
C. 25182
D. 33264

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9. A solid cube has side 8 cm. It is cut along diagonals of top face to get 4 equal parts. What is the total surface area (in cm2) of each part?
Options
A. 96 + 64?2
B. 80 + 64?2
C. 96 + 48?2
D. 80 + 48?2

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10. A regular pyramid has a square base. The height of the pyramid is 22 cm and side of its base is 14 cm. Volume of pyramid is equal to the volume of a sphere. What is the radius (in cm) of the sphere?
Options
A. 493
B. 7
C. 14
D. 983

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