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A seamless water main 1 metre in diameter is required to carry wter under a head of 100 metres. If the maximum permissible tensile stress in the metal is 500 kg/cm2, the thickness of metal required would be

[A].	1 mm	[B].	5 mm
[C].	10 mm	[D].	15 mm
[E].	25 mm

Answer: Option C

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