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    Question

    A cylinder 84 cm long is made of steel. Its external and

    internal diameters are 10 cm and 8 cm respectively. What is the volume of the steel in the cylinder (in 10-3 m┬│) and correct up to three decimal places)?
    A 2.112 Correct Answer Incorrect Answer
    B 2.376 Correct Answer Incorrect Answer
    C 4.752 Correct Answer Incorrect Answer
    D 9.504 Correct Answer Incorrect Answer

    Solution

    Height of the cylinder = 84 cm External radius of the cylinder = 10/2 = 5 cm Internal radius of the cylinder = 8/2 = 4 cm As we know, Volume of the cylinder = ╧А (R2 - r2)h = (22/7) ├Ч (52 - 42) ├Ч 84 cm3 = 22 ├Ч 9 ├Ч 12 cm3 =┬а2376 cm3 = 2376/(100 ├Ч 100 ├Ч 100) m^3 = 2376 ├Ч 10-6 m3 = 2.376 ├Ч 10-3 m3

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