Mensuration Practice Test 1

Question : 25 of 40

Marks: +1, -0

The internal radius and thickness of a hollow metallic pipe are 24 cm and 1 cm respectively. It is melted and recast into a solid cylinder of equal length. The diameter of the solid cylinder will be:

7 cm
14 cm
10 cm
5 cm

Validate

Solution:

Volume of the metallic pipe =

πR^2H

πH(R^2-r^2)

πr^2H

((25)^2-(24)^2)

r^2

625 - 576 =

r^2

r =

√{49}

= 7 cm
Diameter = 14 cm

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