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Fundamental and Derived Units

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I did not understand the numericals of vernier caliper and srew gauge

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Please check these link Vernier Calliper and Screw Gauge

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Q. To measure the volume of a cylinderical wire, its diameter is measured by a screw gauge and is found to be 1.25 mm, and its length is measured with a vernier caliper and is found to be 5.50 cm. The least count of the screw gauge is 0.01 mm, and that of the vernier caliper is 0.01 cm.

Q. The ratio of L.C of screw gauge to the L.C of vernier calipers is _________.

Q. In which of the following instrument used in the lab there exists an error of random category known as back lash error; (i) Screw gauge (ii) Micrometer (iii) Searle’s apparatus
(iv) Vernier calipers

Q. To measure the volume of a cylinderical wire, its diameter is measured by a screw gauge and is found to be 1.25 mm, and its length is measured with a vernier caliper and is found to be 5.50 cm. The least count of the screw gauge is 0.01 mm, and that of the vernier caliper is 0.01 cm.

A

represents the least count of a vernier caliper whose 10 main scale divisions are equal in length to 12 vernier scale divisions, and one main scale division is equal to 1 mm. Say

B

represents the least count of a screw gauge with 25 circular scale divisions and a pitch of 1 mm,

A - B

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