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:
84
90
168
336
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 1 of 4.

Twinkle said:   2 years ago
v.ocyclinder= πr^2h.

Where π equals to 22/7.
22/7*1/20*1/20*h = 66,
11h/1400 = 66,
h = 92400/11,
h = 8400cm,
h = 8400/100m,
h = 84m.
(1)

Akchansh said:   3 years ago
Length of wire should be whole perimeter of cyclinder, why it is calculated same as height?
(2)

Shuvan.s said:   3 years ago
Why do they take 22/2 * 1/20 * 1/20? Please explain it.

Anitha said:   4 years ago
@Surya.

22/7 approximately = 3.14.

Surya said:   4 years ago
How 22/7 possible?
Is it pi value?

π = 3. 144 right?

Kartik said:   4 years ago
Without converting mm into cm answer will be the same ?

Kishan Ghosh said:   5 years ago
I can't understand this.

Prashanth said:   5 years ago
1cm = 10mm.

Jai said:   5 years ago
Because the wire is in the shape of a cylinder.

Chenga said:   6 years ago
Please tell why the shape of wire is consider as a cylinder?
(1)


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