SSC CGL 6 06 2019 Shift 2 Paper

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Question : 70 of 100

Marks: +1, -0

The volume of a metallic cylindrical pipe is 7480 cm

^{ 3}

.
If its length is 1.4m and its external radius is 9cm, then its thickness (given

\π=22/7

) is :

1 cm
0.9 cm
0.8 cm
1.2 cm

Solution:

\ {R}=9

\ {r}=?

\ {\h}=1.4 \ {\m}=140 \ {\cm}

\ {V}=7480 \ {\cm}^{3}

\π (\ {R}^{2} - {r}^{2}\ ) \ {h}=7480

\ {22}/{7}\ (81 - {r}^{2}\ ) 140=7480

81-\ {r}^{2}=17

\ {r}^{2}=64

\ {r}=8

thickness

=\ {R}- {r}

=9-8

=1 \ {\cm}

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