ABC26GN4923 · Volume and Surface Area

Subject: General Aptitude · Chapter: Volume and Surface Area · Exam: · Marks: · Difficulty:

66 cubic centimetres of silver is drawn into a wire 1 mm in diameter. The length of the wire in metres will be

(a)84

(b)90

(c)168

(d)336

Answer

Answer (as printed): A

Explanation

Let the length of the wire be $h$. Radius $=\frac{1}{2} \mathrm{mm}=\frac{1}{20} \mathrm{cm}$. Then, $\frac{22}{7} \times \frac{1}{20} \times \frac{1}{20} \times h=66 \Leftrightarrow h=\left(\frac{66 \times 20 \times 20 \times 7}{22}\right)=8400 \mathrm{cm}=84 \mathrm{m}$.

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