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Volume and Surface Area - General Aptitude

Q1:

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

ANS:A - 84

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