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    Question

    A sphere 'A' has a volume of 256 cm┬│, and its radius is

    'r' cm. If the radius of another sphere 'B' is (r + 1) cm, calculate the curved surface area (in cm┬▓) of sphere 'B'. (Take ╧А = 3)
    A 500 cm┬▓ Correct Answer Incorrect Answer
    B 200 cm┬▓ Correct Answer Incorrect Answer
    C 300 cm┬▓ Correct Answer Incorrect Answer
    D 320 cm┬▓ Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ; (4/3) ├Ч 3 ├Ч r┬│ = 256 4r┬│ = 256 r┬│ = 64 тЗТ r = 4 cm So, radius of sphere 'B' = (r + 1) = 5 cm Curved Surface Area = 4╧Аr┬▓ = 4 ├Ч 3 ├Ч 5┬▓ = 4 ├Ч 3 ├Ч 25 = 300 cm┬▓

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