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  1. If the radius of a sphere be doubled, the area of its surface will become
    1. Double
    2. Three times
    3. Four times
    4. None of the mentioned
Correct Option: C

Original surface area of sphere = πr²
⇒ Surface area of sphere = 4π(2r)²
= 16πr² = 4 × 4πr² = 4 (original surface area)


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