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 5 of 6.
Dhana reddy said:
8 years ago
Why 4^2 -3^2? Please explain this step.
Krishna said:
1 decade ago
Why external radius is 4cm how is it ?
Shivani said:
1 decade ago
Why there is need to multiply by 22/7?
Nagi said:
9 years ago
Why diameter is converted into radius?
S.Vijay said:
1 decade ago
Tell me the formula of this problem?
Lavanya said:
8 years ago
Thank you, well explained @Dhinesh.
Akanksha said:
1 decade ago
How the internal radius comes ?
Junaid said:
8 years ago
Why is the internal radius 3cm?
Ajay said:
8 years ago
Could you explain me about pi?
Pema said:
4 years ago
Why cant it be =pi * 3^2 * 21?
(1)
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