Discussion
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- Question
- A cylinder and a cone have the same height and same radius of the base. The ratio between the volumes of the cylinder and the cone is?
Options- A. 1 : 3
- B. 3 : 1
- C. 1 : 2
- D. 2: 1
- Correct Answer
- 3 : 1
ExplanationRatio of their volumes = [?r2h] / [(1/3)?r2h] = 3/1
= 3 : 1 - 1. The volume of a sphere is 88/21 x (14) 3 cm 3. The curved surface of this sphere is?
Options- A. 2424 cm2
- B. 2446 cm2
- C. 2464 cm2
- D. 2484 cm2 Discuss
- 2. If the volume and surface are of a sphere are numerically the same then its radius is?
Options- A. 1 unit
- B. 2 unit
- C. 3 unit
- D. 4 unit Discuss
- 3. The number of small cubes with edges of 10 cm that can be accommodated in a cubical box 1 meter edge is?
Options- A. 10
- B. 100
- C. 1000
- D. 10000 Discuss
- 4. The area of the base of a rectangular tank is 6500 sq. cm and the volume of water contained in it is 2.6 cubic meters. The depth of water is?
Options- A. 3.5 m
- B. 4 m
- C. 5 m
- D. 8 m Discuss
- 5. In a shower, 5 cm of rain falls. The volume of water that falls on 2 hectare of ground, is?
Options- A. 100 m3
- B. 1000 m3
- C. 10 m3
- D. 10000 m3 Discuss
- 6. The side of a cube measures 9 cm. What will be the diagonal of the cube (in cm)?
Options- A. 5?3
- B. 7?3
- C. 9?3
- D. 3?3 Discuss
- 7. What will be the surface area of the sphere having 4 cm radius?
Options- A. 64? sq cm
- B. 69? sq cm
- C. 32? sq cm
- D. 35? sq cm Discuss
- 8. A hemisphere has 3 cm radius. Calculate its volume.?
Options- A. 4/3 ? cm3
- B. 13 ? cm3
- C. 18? cm3
- D. 19/? cm3 Discuss
- 9. Find the total surface area of a pyramid having a slant height of 8 cm and a base which is a square of side 4 cm (in cm 2)?
Options- A. 80
- B. 64
- C. 72
- D. 84 Discuss
- 10. A sphere of radius r has the same volume as that of a cone with circular base of radius r. Find the height of the cone.?
Options- A. 2r
- B. r/3
- C. 4r
- D. (2/3)r Discuss
Volume and Surface Area problems
Search Results
Correct Answer: 2464 cm2
Explanation:
? (4/3) x (22/7) x r3 = (88/21) x (14)3
? r = 14
? Curved surface = 4 x (22/7) x 14 x 14 cm2 = 2464 cm2
Correct Answer: 3 unit
Explanation:
4/3 ?r3 = 4?r2
? r = 3 units.
Correct Answer: 10000
Explanation:
Number of cubes = (100 x 100 x 100)/(10 x 10 x 10) = 1000
Correct Answer: 4 m
Explanation:
Let depth = D cm.
Then, D x 6500 = 2.6 x 100 x 100 x 100
? D = (2.6 x 100 x 100 x 100) / 6500 cm
= 400 cm = 4 cm
Correct Answer: 1000 m3
Explanation:
Volume = Area x Thickness of rainfall
= 2 x 10000 x (5/100) m3
= 1000 m3
Correct Answer: 9?3
Explanation:
Given, side of cube, a = 9
? Diagonal of cube = a?3 = 9?3
Correct Answer: 64? sq cm
Explanation:
Required surface area = 4?r2
= 4 x ? x 42 = 664? sq cm
Correct Answer: 18? cm3
Explanation:
volume = (2/3)?r3
= (2/3) x ? x 33
= (2/3) x ? x 27
= 18? cm3
Correct Answer: 80
Explanation:
Total surface area of the pyramid
= [1/2(perimeter of the base) (Slant height) ] + Area of the base
= 1/2 (4) (4) (8) + 42 = 80 cm2
Correct Answer: 4r
Explanation:
Given that,
Volume of sphere = Volume of cone
? (4/3)?r3 = (1/3)?r2h
? 4r = h
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