RRB Junior Engineer Stage 1 Model Papers 3

Question : 23 of 100

Marks: +1, -0

A copper wire of length 36 m and diameter 2 mm is melted to form a sphere. The radius of the sphere (in cm) is

Solution:

Volume of the wire

=πr^2h

∴π×0.1×0.1×3600 cm^3

⇒36πcm^3

Volume cylinder = vol. sphere
Volume of the sphere

=4/3πR^3

=36π

⇒R^3={36×3}/4=27

∴R=√^3{27}=3 cm

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