Aptitude - Volume and Surface Area - Discussion
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Read more:"I do not seek. I find."
- Pablo Picasso
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| 4. |
66 cubic centimetres of silver is drawn into a wire 1 mm in diameter. The length of the wire in metres will be:
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| [A]. |
84 | [B]. |
90 | | [C]. |
168 | [D]. |
336 |
Answer: Option A
Explanation:
Let the length of the wire be h.
| Radius = |
1 |
mm |
= |
1 |
cm. |
Then, |
| 2 |
20 |
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22 |
x |
1 |
x |
1 |
x h = 66. |
| 7 |
20 |
20 |
| h = |
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66 x 20 x 20 x 7 |
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= 8400 cm = 84 m. |
| 22 |
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Anju said:
(Thu, Sep 16, 2010 02:18:34 PM)
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| From where d 22/7 came? |
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Richa said:
(Thu, Dec 2, 2010 09:45:04 AM)
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Its formula pai*r^2*h.
Pai's value is 22/7.
I'm not gettng the sign of pai in computer. Ok. |
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Rakesh said:
(Sat, May 28, 2011 07:06:59 AM)
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| When 1mm diameter is converted into radius it is .5 mm or .5/1000 meter. |
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Prasad said:
(Sat, Aug 6, 2011 10:37:19 PM)
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| Simple. The volume is given in mm and the length in meters. Hence the length should be minimal. |
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Rashmi said:
(Tue, Jan 10, 2012 07:59:22 PM)
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| Can anybody say me how did we get 1/20? |
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