If the radius of a hemisphere is 5 cm, then its volume is

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If the radius of a hemisphere is 5 cm, then its volume is
(a) \frac { 250 }{ 3 } \pi { \quad cm }^{ 3 }
(b) \frac { 500 }{ 3 } \pi { \quad cm }^{ 3 }
(c) 75\pi { \quad cm }^{ 3 }
(d) \frac { 125 }{ 3 } \pi { \quad cm }^{ 3 }

Solution:

Radius of a hemisphere (r) = 5 cm
ML Aggarwal Class 10 Solutions for ICSE Maths Chapter 17 Mensuration MCQS Q11.1

If the ratio of the diameters of the two spheres is 3: 5, then the ratio of their surface areas is
(a) 3: 5
(b) 5 : 3
(c) 27: 125
(d) 9: 25

Solution:

Ratio in the diameters of two spheres = 3: 5
Let radius of the first sphere = 3x cm
and radius of the second sphere = 5x cm
Ratio in their surface area
ML Aggarwal Class 10 Solutions for ICSE Maths Chapter 17 Mensuration MCQS Q12.1

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