15.How to take a reading on vernier calliper and screw gauge

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Q. A vernier callipers is more accurate in measurement than a screw gauge.

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Which of the following measures a small length to a high accuracy : metre rule, vernier callipers, screw gauge ?

Q. Which of the following measures a small length to a high accuracy,
a) Meter scale
b) Vernier callipers and
c) Screw gauge

Consider a Vernier calipers in which each $1 c m$ on the main scale is divided into $8$ equal divisions and a screw gauge with $100$ divisions on its circular scale. In the Vernier callipers, $5$ divisions of the Vernier scale coincide with $4$ divisions on the main scale and in the screw gauge, one complete rotation of the circular scale moves it by two divisions on the linear scale. Then

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