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SSC Sample Paper SSC CGL - Sample Paper-23

  • 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 \[\left( \text{Take}\,\,\pi \text{=}\frac{22}{7} \right)\]

    A) 1764 cu cm                   

    B) 880 cu cm

    C) 440 cu cm        

    D) 220 cu cm

    Correct Answer: C

    Solution :

    \[\because \] \[{{r}_{1}}=4\,cm\] and \[{{r}_{2}}=3\,cm\] \[h=20\,cm\] \[\therefore \]      Volume of iron \[=\pi (r_{1}^{2}-r_{2}^{2})\times h\]             \[=\frac{22}{7}({{4}^{2}}-{{3}^{2}})\times 20\]             \[=\frac{22}{7}(16-9)\times 20\]             \[=22\times 20=440\,cu\,cm\]     


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