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RRB Junior Engineer Stage 1 Model Papers 6
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© examsnet.com
Question : 7
Total: 99
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
36000
27000
90000
40000
Validate
Solution:
Total number of spherical balls
=
vol. of cylindrical rod
vol. of spherical balls
=
π
×
(
30
)
2
×
40
4
3
×
π
×
(
1
)
3
=
30
×
30
×
40
4
×
3
=
27000
© examsnet.com
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