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281. The radius of a sphere is 2r, then its volume will be:

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282. If the height of a cone is doubled then its volume is increased by:

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283. If the T.S.A of a cylinder is 450 cm² and its base circumference is 50 cm then the sum of its height and radius is:

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284. If A, B and C denote the areas of three adjacent faces of a cuboid, then its volume is:

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285. If the radius of a hemisphere is 3r cm, then its volume (in cm³) is:

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286. A right circular cylinder has base radius of 10.5 cm and haight 14 cm. Its curved surface area is:

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287. If the dimensions of a cuboid are a, b and c respectively, then the volume of the cuboid is:

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288. If the diameter of a sphere and the side of a cube are equal, then the ratio of volume of the cube to that of the sphere is:

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289. The total surface area of a right circular cylinder is:

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290. The volume of a cuboid is ‘a’ cm³. If its length, breadth and height are each doubled, the new volume (in cm³) will be:

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