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  1. The radii of the base of two cylinders are in the ratio 3 : 5 and their heights in the ratio 2 : 3. The ratio of their curved surface will be :
    1. 2 : 5
    2. 2 : 3
    3. 3 : 5
    4. 5 : 3
Correct Option: A

Let for the first cylinder,
r1 = 3x
h1 = 2y For the second cylinder,
r2 = 5x
h2 = 3y

∴
2πr1h1
 =
2π × 3x × 2y
 =
2
2πr2h22π × 5x × 3y5

⇒ 2 : 5


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