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Volume and Surface Area of Solid Figures

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  1. The number of solid spheres each of diameter 6 cm that could be moulded to form a solid metal cylinder 4 cm, is ?
    1. 3
    2. 4
    3. 5
    4. 6
Correct Option: C

Let the number of spheres be N
Then, N x 4/3 π x (3)3 = π x (2)2 x 45
⇒ 36N = 180
∴ N = 180/36 = 5


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