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 6 of 6.
Anupam Tripathi said:
1 decade ago
Why internal radius is 3 cm?
Gautam said:
8 years ago
Isn't weight=mass*gravity?
Gopal said:
1 decade ago
How to convert gm to kg ?
Anju said:
1 decade ago
Why internal radius is 3?
Avani said:
9 years ago
Same doubt @Rajadurai.
Sanoop said:
1 decade ago
How comes 462*8 gm?
Mritunjay said:
8 years ago
1dm=how many metre
Manasa said:
9 years ago
Diameter d = 2r.
Indranath said:
8 years ago
Why not (4-3)^2?
Deepak M said:
8 years ago
Thank you all.
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers