Discussion
Micrometer works on the principle of:
Answer: D
A micrometer works on the principle of the nut and bolt, that is, a screw turning in a nut.
The spindle carries a precision screw thread, usually of 0.5 mm pitch, that turns in a fixed nut in the frame. Each full turn of the thimble moves the spindle along its axis by exactly one pitch, so a small linear movement is magnified into a large, easily divided rotation: one of 50 thimble divisions is 0.01 mm.
'Screw' alone names only half of the pair; the principle depends on the screw moving in a nut. A bolt alone or a stud cannot convert rotation into a measured advance.
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