RRB Junior Engineer Stage 1 Model Papers 6

Question : 7 of 99

Marks: +1, -0

A cylindrical rod of radius 30 cm and length 40 cm is melted and made into spherical balls of radius 1 cm. The number of spherical balls is

Solution:

\text "Total number of spherical balls"={\text "vol. of cylindrical rod"}/{\text "vol. of spherical balls"}

={π×(30)^2×40}/{4/3×π×(1)^3}={30×30×40}/4×3=27000

Go to Question:

Prev Question

Next Question