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Blacksmith have big iron ball of diameter36cm. He first formed four identical cylindrical rod out of this ball for some construction work. When he finished his work with the cylindrical rod, he again mixed all the iron rod and formed some identical small balls, each of radius 9cm.a) If the diameter of each cylinder formed by him is 12cm, then height of each of them is- (a) 54cm (b) 36cm (c) 45cm (d) 72cm b) The number of small balls formed by the blacksmith? (a) 6 (b) 10 (c) 8 (d) 16What is the cost price of steel coating of a cylindrical iron rod at the rate of Rs.3.5per 100cm^2?(a) Rs.79.20 (b) Rs.89.20 (c) Rs.85.56 (d) Rs.71.28 |
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