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SSC Sample Paper Mock Test-12 SSC CGL Tear-II Paper-1

  • question_answer
    A hollow cylindrical tube 20 cm long, is made of iron and its external and internal diameters are 8 cm and 6 cm respectively. The volume of iron used in making the tube is re \[\left( \pi =\frac{22}{7} \right)\]

    A) 1760 cu cm

    B)         880 cu cm

    C)  440 cu cm

    D)  220 cu cm

    Correct Answer: C

    Solution :

    The volume of iron used \[=\pi r_{1}^{2}h-\pi r_{2}^{2}h=\pi h\,\,(r_{1}^{2}-r_{2}^{2})\] \[=\frac{22}{7}\times 20\,\,({{4}^{2}}-{{3}^{2}})=\frac{22}{7}\times 20\times 7=440\,\,\text{cu}\,\,\text{cm}\]


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