If 3.96 cubic m of lead is to be drawn into a cylindrical wire of diameter 0.6 cm, then the length of the wire (in metres), is:
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Correct answer: A
Explanation
The correct answer is option 1 i.e 140 m
The volume of the cylinder = πr2h = 3.96dm3
⇒ (22/7) × (0.3/100)2 × h = 3.96 × 10-3
⇒ h = (3.96 × 10-3 × 7 × 100 × 100)/22 × 0.3 × 0.3
⇒ 140 m