The water for a factory is stored in a hemispherical tank whose
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    Surface Areas and Volumes

    Multiple Choice QuestionsShort Answer Type

    391. The curved surface area of a cylindrical pillar is 264 m2 and its volume is 924 m3. Find the diam eter and height of the pillar.

    open parentheses Use space straight pi equals 22 over 7 close parentheses
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    392. Find the volume of the largest right circular cone that can be cut off from a cube where edge is 9 cm.

    open parentheses Use space straight pi equals 22 over 7 close parentheses
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    393. Sheena has a piece of canvas, whose area is 550 m2. She uses it to have a conical tent made with a base radius 7 m. Find the volume of the tent that can be made with it.

    open parentheses Use space straight pi space equals space 22 over 7 close parentheses
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    394. A cylindrical tube opened at both ends is made of iron sheet which is 2 cm thick. If the outer diameter is 16 cm and its length is 100 cm, find how many cubic centimeters of iron has been used in making a tube?

    open parentheses Use space straight pi space equals 22 over 7 close parentheses
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    395. The water for a factory is stored in a hemispherical tank whose internal diameter is 14 m. The tank already contains 50 kiloliters of water. Water is pumped into the tank to fill its capacity. Calculate the volume of water pumped into the tank.

    open parentheses Use space straight pi equals 22 over 7 close parentheses

    Solution not provided.

    Ans. 2006 over 3 straight m cubed

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    396. A match box measures 4 cm x 2.5 cm x 1.5 cm. What will be the volume of a packet containing 12 such boxes?
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    397. Monica has a piece of canvas whose area is 818 m2. She uses it to have a conical tent made, with a base radius of 10 m. Assuming that all the stitching margin and the wastage incurred while cutting amounts to approximately 1.6 nr, find the volume of the tent that can be made with it.
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    398. A wall 4 m long, 3 m height and 13 cm thick is made up of bricks each measuring 20 cm x 12 cm x 6.5 cm. Find the number of bricks required to build the wall.
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    399.  Find the total surface area and volume of a hemisphere of radius square root of 3 a units.
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    400. A wooden bookshelf has external dimensions as follows: Height = 110 cm, Depth = 25 cm, Breadth = 85 cm (see figure). The thickness of the plank is 5 cm everywhere. The external faces are to be polished and the inner faces are to be painted. If the rate of polishing is 20 paise per cm2 and the rate of painting is 10 paise per cm2, find the total expenses required for polishing and painting the surface of the bookshelf.
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