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Volume and Surface Area of Solid Figures

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  1. Weight of a solid metallic sphere of radius 4 cm is 4 kg. The weight of a hollow sphere made with same metal, whose outer diameter is 16 cm and inner diameter is 12 cm, is ?
    1. 20.5 kg
    2. 15.5 kg
    3. 16.5 kg
    4. 18.5 kg
Correct Option: D

Volume of solid sphere of radius 4 cm = (4/3)π(4)3 cm3
Volume of hollow sphere = 4/3π[(8)3 - (6)3] cm3
∵ Weight of 4/3π(4)3 cm3 = 4 kg
= 4(512 - 216)/43 = 18.5 kg


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