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Correct Answer: (B)
internal thread
Explanation: an internal thread is that which formed on the inside of a workpiece e.g. on female screw gauge or a nut. an external thread is that which formed on the outside of a workpiece e.g on bolts or studs.
Explanation by: Mr. Dubey
an internal thread is that which formed on the inside of a workpiece e.g. on female screw gauge or a nut. an external thread is that which formed on the outside of a workpiece e.g on bolts or studs.
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