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  1. A right circular cylinder just encloses a sphere of radius r. The ratio of the surface area of the sphere and the curved surface area of the cylinder is
    1. 2 : 1
    2. 1 : 2
    3. 1 : 3
    4. 1 : 1
Correct Option: D

Let Height of the cylinder = 2r
Curved surface area of the cylinder = 2πRH
∴ Required ratio = 4πr² : 2π × r × 2r = 1 : 1


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