Question

define least count of any device 1)screw guage 2)vernier caliper​

Answer 1

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The least count as the name suggests is the finest measurement you can take with the help of that Vernier calipers. It is measured by dividing the least count of the main scale by the total number of divisions on the Vernier scale. The Least Count (LC) of Vernier scale is given as

Least count =Least count of main scale / Number of divisions on Vernier scale.

Least count of the main scale: The main scale is calibrated in millimeters. To get the least count of the main scale, count the number of divisions on the main scale in one cm of it. Divide 1 cm into that much number of divisions; the value obtained is the least count of the main scale in cm. For example, if there are 10 divisions in one centimeter of the main scale its least count = 1/10 = 0.1 cm.

Number of divisions on Vernier scale: In most Vernier calipers, the Vernier scale has 10 divisions. Count the number of divisions on the Vernier scale. Use a magnifying glass if necessary.

For most Vernier calipers least count of main scale = 0.01 cm and number of divisions on Vernier scale = 10 divisions. Thus

Least Count of Vernier calipers = 0.1/ 10 cm

Least Count of Vernier calipers= 0.01 cm

Since the least count of the Vernier caliper is 0.01 cm, it can be said that when measuring with the help this Vernier caliper, you can get an accuracy of 0.01 cm.

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Answer 2

Answer:

Least count: The least count of the screw is defined as the distance moved by the tip of the screw when turned through one division of the head scale. Micrometer screw gauge is defined as an instrument that is used for measuring the diameter of thin wires, the thickness of small sheets such as glass or plastics.

Least count of a Vernier calipers is 0.01 cm. When the two jaws of the instrument touch each other the 5th division of the Vernier scale coincide with a main scale division and the zero of the Vernier scale lies to the left of the zero of the main scale.

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