Discussion
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- Question
A regular square pyramid has side of its base 20 cm and height 45 cm is melted and recast into regular triangular pyramids of equilateral base of side 10 cm and height 10?3 cm. What are the total numbers of regular triangular pyramid?
Options- A. 24
- B. 20
- C. 27
- D. 28
- Correct Answer
- 24
- 1. A solid cube is cut into 27 identical cubes. What is the percentage increase in the total surface area?
Options- A. 150
- B. 200
- C. 300
- D. 250 Discuss
- 2. Three toys are in a shape of cylinder, hemisphere and cone. The three toys have same base. Height of each toy is 2?2 cm. What is the ratio of the total surface areas of cylinder, hemisphere and cone respectively?
Options- A. 4 : 3 : [(?2) + 1]
- B. 4 : 3 : [2 + (?2)]
- C. 4 : 3 : 2?2
- D. 2 : 1 : (1 + ?2) Discuss
- 3. Two spheres of equal radius are taken out by cutting from a solid cube of side (12 + 4?3) cm. What is the maximum volume (in cm3) of each sphere?
Options- A. 1077.31
- B. 905.14
- C. 966.07
- D. 1007.24 Discuss
- 4. A cylinder of radius 4.5 cm and height 12 cm just fits in another cylinder completely with their axis perpendicular. What is the radius (in cm) of second cylinder?
Options- A. 5
- B. 6
- C. 15
- D. 7.5 Discuss
- 5. A regular hexagonal base prism has height 8 cm and side of base is 4 cm. What is the total surface area (in cm2) of the prism?
Options- A. 54(3 + ?3)
- B. 36(3 + ?3)
- C. 48(4 + ?3)
- D. 24(4 + ?3) Discuss
- 6. If a cylinder of radius 7 cm and height 9 cm is melted and constructed into a cone of the same radius, what will be the height of this cone?
Options- A. 54 cm
- B. 9 cm
- C. 27 cm
- D. 13.5 cm Discuss
- 7. What is the measure of an interior angle of a regular dodecagon?
Options- A. 120°
- B. 140°
- C. 150°
- D. 144° Discuss
- 8. Find the curved surface area (in cm2) of a right circular cylinder of diameter 28 cm and height 12 cm.
Options- A. 968
- B. 924
- C. 856
- D. 1056 Discuss
- 9. A cone of height 12 cm and diameter 10 cm is mounted on a hemisphere of the same diameter. What is the volume of the solid thus formed?
Options- A. 384.13 sq cm
- B. 576.19 sq cm
- C. 192.06 sq cm
- D. 288.1 sq cm Discuss
- 10. At least two pairs of consecutive angles are congruent in a _____.
Options- A. Parallelogram
- B. Isosceles trapezium
- C. Rhombus
- D. Kite Discuss
Volume and Surface Area problems
Search Results
Correct Answer: 200
Correct Answer: 4 : 3 : [(?2) + 1]
Correct Answer: 905.14
Correct Answer: 7.5
Correct Answer: 48(4 + ?3)
Correct Answer: 27 cm
Correct Answer: 150°
Correct Answer: 1056
Correct Answer: 576.19 sq cm
Correct Answer: Isosceles trapezium
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