Aptitude - Volume and Surface Area - Discussion
Discussion Forum : Volume and Surface Area - General Questions (Q.No. 5)
5.
A hollow iron pipe is 21 cm long and its external diameter is 8 cm. If the thickness of the pipe is 1 cm and iron weighs 8 g/cm3, then the weight of the pipe is:
Answer: Option
Explanation:
External radius = 4 cm,
Internal radius = 3 cm.
| Volume of iron |
|
||||||
|
|||||||
| = 462 cm3. |
cm3
Weight of iron = (462 x 8) gm = 3696 gm = 3.696 kg.
Discussion:
60 comments Page 3 of 6.
Roney said:
6 years ago
@Nazim.
From both side the 1cm will be deducted.
so dia = 6cm radius 3cm.
From both side the 1cm will be deducted.
so dia = 6cm radius 3cm.
(5)
Sandeep said:
1 decade ago
Because external diameter is 8cm then.
External radius is 8/2=4cm.
External radius is 8/2=4cm.
Thuru said:
9 years ago
I don't understand this.
Is there any easy way to understand this?
Is there any easy way to understand this?
Sai dileep said:
9 years ago
What is the formula for calculating the volume of this problem?
Nagi said:
9 years ago
Please anyone say why we are taking radius instead of diameter?
Rahul said:
6 years ago
There is a formula for hollow sphere 3.14 (R^2-r^2)h.
Rohan said:
7 years ago
How did you find out the DENSITY = 8? Please explain.
Tejas said:
1 decade ago
What is iron pipe here?
Is it volume of cylinder?
Is it volume of cylinder?
Dinesh Reddy said:
3 years ago
Can anyone explain this answer once again deeply?
(1)
VINU said:
1 decade ago
Why subtract external radius to internal radius?
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