Question

State one use of screw gauge.

Answer 1

Hint: Here, we will first learn about the screw gauge and then further study about some of its uses that are very important. Further, we will also go through the limitation of a screw gauge and precautions before using the screw gauge.

Complete step-by-step answer:
As we know that the screw gauge is defined as an instrument that is used for measuring exactly the diameter of a thin wire or the width of a sheet of metal with very less error.  
The three uses of a screw gauge are written following:
1) It is used to measure the diameter of circular objects mostly wires with an accuracy of 0.001cm.
2) It can be used to measure the diameter of a wire.
3) Also, it can be used to measure thickness of a paper.

Additional Information: A screw gauge comprises a U-shaped mount. This is fixed with a screwed pin which is further fixed to a thimble. Also, side by side to the axis of the thimble, a scale passed in mm is inscribed. With this U shaped metallic mount, a screw gauge measures even the tiniest length and thinnest thickness with exact accuracy.
The main part of the device checks the exactness and also stops the object from getting ruined. The key scale reading is taken considering also the 0.5 mm divisions that are given below the key scale.
As there are some very important uses of screw gauge, there is also a certain disadvantage of a screw gauge. The disadvantage of the micrometer screw gauge was that its measuring capability was very much limited and so the other instruments had this advantage. If we take an example of the use of screw gauge in daily practice, one of its limitations that were implemented in the lab was that the micrometer screw gauge couldn't measure the internal diameter of the hollow cylinder.

Note: Screw gauge is a very essential measuring tool, as it has very high accuracy of measuring thinnest and the tiniest length. There can be instrumental error, so before working with the screw gauge, do not forget to check the instrumental error and the least count of the screw gauge.