Explain the terms —
(i) pitch, and
(ii) least count of a screw gauge.
How are they determined?
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State three uses of a vernier callipers.
Name the two scales of a vernier callipers and explain, how it is used to measure a length correct up to 0.01 cm.
How can the least count of a screw gauge be decreased?
What do you mean by zero error of a screw gauge? How is it accounted for?