Discussion
A left hand screw advances in which rotation:
Answer: B
A left hand screw advances when turned anticlockwise.
A normal right-hand thread advances, or tightens, when turned clockwise. A left-hand thread is the mirror image, so it advances when turned anticlockwise and loosens when turned clockwise.
Left-hand threads are used where normal rotation would loosen a right-hand nut, for example on the left pedal of a bicycle, a grinder's left-hand wheel nut and gas cylinder fittings. Clockwise is the right-hand case. A thread cannot advance in any direction, because the helix fixes which way it travels.
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