Aptitude - Volume and Surface Area - Discussion
Discussion Forum : Volume and Surface Area - General Questions (Q.No. 4)
4.
66 cubic centimetres of silver is drawn into a wire 1 mm in diameter. The length of the wire in metres will be:
Answer: Option
Explanation:
Let the length of the wire be h.
| Radius = | 1 | mm | = | 1 | cm. | Then, |
| 2 | 20 |
 |
22 | x | 1 | x | 1 | x h = 66. |
| 7 | 20 | 20 |
| h = |
 |
66 x 20 x 20 x 7 |  |
= 8400 cm = 84 m. |
| 22 |
Discussion:
35 comments Page 2 of 4.
Megha said:
1 decade ago
Still I didn't get how we get 1/20? Please explain me step by step.
Rohini said:
1 decade ago
They have given d diameter. But we need radius. So when 1 mm is divided by 2, we get 1/2 mm and to convert mm into cm we have to multiply it by 10.
Therefore, 1/2 multiply by 10, we get 1/20.
Therefore, 1/2 multiply by 10, we get 1/20.
(1)
Uma said:
10 years ago
How we know that the wire convert into cylinder form, may be its convert other shapes.
Adil said:
10 years ago
Please tell the formula.
Archana said:
9 years ago
@Adil.
Formula of volume of cylinder is Pi * r * r * h.
Formula of volume of cylinder is Pi * r * r * h.
Avani said:
9 years ago
@Rashmi, @Megha.
1cm=10mm.
? =1/2mm.
Cross multiplication
1/2 * 1/10.
= 1/2 * 10.
= 1/20 m.
1cm=10mm.
? =1/2mm.
Cross multiplication
1/2 * 1/10.
= 1/2 * 10.
= 1/20 m.
Aboo farhan said:
9 years ago
We know that d = 2r then r = d/2mm and here d is given 1mm and 1mm convert in cm then r = 1/20cm.
Amit said:
9 years ago
1/2 * 10 = 5 >_<.
But.
1/2 = .5 mm.
And to convert it into cm we have to divide it by 10.
So, .5/10 = .05cm.
5/100 = 1/20 cm.
But.
1/2 = .5 mm.
And to convert it into cm we have to divide it by 10.
So, .5/10 = .05cm.
5/100 = 1/20 cm.
Amit said:
9 years ago
1/2 is divided by 10.
1/2/10 = 1/2/10 (1/2/10/1 same thing).
Then.
1/2 * 1/10 = 1/20.
1/2/10 = 1/2/10 (1/2/10/1 same thing).
Then.
1/2 * 1/10 = 1/20.
Suhani bajpai said:
9 years ago
What is meant by 66 cubics? and why is it equal to the volume of a cylinder?
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