RRB Non Technical Model Papers 6 with solutions

Question : 60 of 100

Marks: +1, -0

A spherical lead ball of radius 10 cm is melted and small lead balls of radius 5 mm are made. The total number of possible small lead balls is

Solution:

(1) Radius of bigger spherical lead ball is r =10 cm= 100 mm and radius of smaller lead ball is

r_s = 5mm.

So, the total number of spherical lead ball will be

{4/3πr^3}/{4/3 πr^3_s}= {r^3}/{r^3_s}=100^3 /5^3=8000

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