Question

give a Short description of the
procedures to measure the length of a rod using vernier calipers​

Answer 1

Measuring the length of a small rod using vernier calipers: The rod whose length is to be measured is placed in between the fixed end and the vernier scale as shown in the figure. In this position, the zero mark of the vernier scale is ahead of 1.2 cm mark on main scale.

Answer 2

Explanation:

The precision of length measurements may be increased by using a device that uses a sliding vernier scale. Two such instruments that are based on a vernier scale which you will use in the laboratory to measure lengths of objects are the vernier callipers and the micrometer screw gauge. These instruments have a main scale (in millimetres) and a sliding or rotating vernier scale. In figure 1 below, the vernier scale (below) is divided into 10 equal divisions and thus the least count of the instrument is 0.1 mm. Both the main scale and the vernier scale readings are taken into account while making a measurement. The main scale reading is the first reading on the main scale immediately to the left of the zero of the vernier scale (3 mm), while the vernier scale reading is the mark on the vernier scale which exactly coincides with a mark on the main scale (0.7 mm). The reading is therefore 3.7 mm.

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