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- Question
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
- Correct Answer
- 2.1 23
- 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 Discuss
- 2. A right circular solid cylinder has radius of base 7 cm and height is 28 cm. It is melted to form a cuboid such that the ratio of its side is 2 : 3 : 6. What is the total surface area (in cm2) cuboid?
Options- A. 215633
- B. 215693
- C. 214833
- D. 204833 Discuss
- 3. The height of a cone is 24 cm and the area of the base is 154 cm2 . What is the curved surface area (in cm2) of the cone?
Options- A. 484
- B. 550
- C. 525
- D. 515 Discuss
- 4. The base of a prism is in the shape of an equilateral triangle. If the perimeter of the base is 18 cm and the height of the prism is 20 cm, then what is the volume (in cm3) of the prism?
Options- A. 60?3
- B. 30?6
- C. 60?2
- D. not know Discuss
- 5. What can be the maximum number of common tangent which can be drawn to two non-intersecting circles?
Options- A. 2
- B. 4
- C. 3
- D. 6 Discuss
- 6. 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 Discuss
- 7. 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 Discuss
- 8. 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 Discuss
- 9. 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 Discuss
- 10. 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 Discuss
Volume and Surface Area problems
Search Results
Correct Answer: 308
Correct Answer: 215693
Correct Answer: 550
Correct Answer: not know
Correct Answer: 4
Correct Answer: 386.5
Correct Answer: 16?2 ? ?16
Correct Answer: 3?3
Correct Answer: 56
Correct Answer: 7 : 10
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