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IBPS RRB Officer Prelims 09 Sep 2017 Shift 2 Paper
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© examsnet.com
Question : 44
Total: 80
The sum of the radius and height of a right circular cylinder is 30 metre. If the total surface area of the cylinder is 2640 metre2, what is its volume? (in cu. metre)
9856
9772
9548
10028
9784
Validate
Solution:
(1) It is given,
r + h = 30 metre
Total surface area of cylinder
= 2pr (r + h)
∴ 2pr (r + h) = 2640
⇒
2
×
22
7
×
r
×
30
=
2640
⇒
r
=
2640
×
7
2
×
22
×
30
=
14
m
e
t
r
e
∴h = 30 – 14 = 16 metre
∴Volume of cylinder =
π
r
2
h
=
[
22
7
×
14
×
×
14
×
16
]
cu. metre
= 9856 cu. metre
© examsnet.com
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