The volumes of a cone and a hemisphere have the same volume. The

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 Multiple Choice QuestionsMultiple Choice Questions

231. The ratio of the radii of two cylindrical pillars is 3 : 2 and the ratio of their heights is 2 : 3. Find the ratio of their curved surface areas,
  • 1 : 1  
  • 3 : 2
  • 1 : 3
  • 1 : 3
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232. How many times will the surface area of a sphere become if its radius is doubled?
  • 2 times 
  • 4 times
  • 8 times 
  • 8 times 
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233. The area of the four walls of a room is 80 cm2 and its height is 4 m. Then, the perimeter of the floor of the room is
  • 16 m

  • 5 m
  • 20 m   
  • 20 m   
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234. The perimeter of the floor of a room is 30 m and its height is 4 m. Find the area of the four walls of the room
  • 120 m2 
  • 60 m2
  • 240 m2
  • 240 m2
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235. The diameter of a cylindrical bottle is 10 cm. A liquid is filled into it upto a height of 14 cm. Then, the volume of the liquid is
  • 1200 cm3  
  • 1100 cm3
  • 1500 cm3 
  • 1500 cm3 
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236. The ratio of the radii of the two spheres is 2 : 3. The ratio of their volumes is
  • 7 : 8
  • 8 : 27
  • 4 : 9
  • 4 : 9
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237. If the ratio of the radii of the two cylinders is 2    : 3 and the ratio of their heights is 3 : 4, then the ratio of their volumes is
  • 2 : 1
  • 3 : 1
  • 1 : 3
  • 1 : 3
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238.

The ratio of the radii of two cones is 3 : 1 and the ratio of their heights is 1 : 3. Then, the ratio of their volumes is

  • 2 : 1
  • 3 : 1
  • 1 : 3 
  • 1 : 3 
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239. A cone, a hemisphere and a cylinder are formed on the same base and with same height. The ratio of their volumes is
  •  2 : 1 : 3 
  • 1 : 2 : 3
  • 3 : 1 : 2
  • 3 : 1 : 2
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240. The volumes of a cone and a hemisphere have the same volume. The ratio of their heights is 
  • 1 : 3 
  • 1 : 2
  • 2 : 3
  • 2 : 3


D.

2 : 3
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