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UPSC 2017 CDS I Math Paper
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© examsnet.com
Question : 73
Total: 100
A ball of radius 1 cm is put into a cylindrical pipe so that it fits inside the pipe. If the length of the pipe is 14 m, what is the surface area of the pipe ?
[2017 CDS-I]
2200 square cm
4400 square cm
8800 square cm
17600 square cm
Validate
Solution:
It is given that the ball fits inside the pipe.
Therefore, radius of the pipe = Radius of the ball = r = 1 cm
Length of the pipe = h = 14 m = 1400 cm
Therefore, surface area of the pipe
=
2
π
r
h
=
2
×
22
7
×
1
×
1400
=
8800
c
m
2
© examsnet.com
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