If the radius of a sphere is 2r, then its volume will be

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If the radius of a sphere is 2r, then its volume will be
(a) \frac { 4 }{ 3 } \pi { r }^{ 3 }
(b) 4\pi { r }^{ 3 }
(c) \frac { 8\pi { r }^{ 3 } }{ 3 }
(d) \frac { 32\pi { r }^{ 3 } }{ 3 }

Solution:

Radius of a sphere = 2r
ML Aggarwal Class 10 Solutions for ICSE Maths Chapter 17 Mensuration MCQS Q9.1

If the diameter of a sphere is 16 cm, then its surface area is
(a) 64π cm2
(b) 256π cm2
(c) 192π cm2
(d) 256 cm2

Solution:

Diameter of a sphere = 16 cm
Radius (r) = \\ \frac { 16 }{ 2 } = 8 cm
Surface area = 4π2 = 4π × 8 × 8 cm2 = 256π cm2 (b)

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