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A spherical metal vessel 120 cm diameter is subjected to an internal pressure of 15 kg/sq cm. If the permissible stress is 625 kg/sq cm and the efficiency of the riveted joints is 75%, the required thickness of the plate would be

[A].	1 mm	[B].	2 mm
[C].	5 mm	[D].	8 mm
[E].	10 mm

Answer: Option E

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