Lab Activity: To Measure Diameter Using Screw Gauge

Cotyledons are also called-

In the observation and calculation of measuring diameter using a screw gauge, why is it important to take readings at multiple places along the entire length of the wire?

In the meter bridge experiment, why is it essential to avoid the error of parallax?

A student took the following readings when it was used to measure the diameter of a wire.

Given that, $1 \mathrm{mm}$ on the main scale, it corresponds to $100$ divisions of the circular scale. The diameter of wire from the above data is

The diameter D of a wire is measured using screw gauge of zero error. Then:

In the procedure for measuring the wire's diameter using a Screw Gauge, Linear scale reading (L.S.R) is recorded by noting down the no.of visible and uncovered divisions of linear scale. Why is it necessary to repeat this step, rotating the wire to $90°$, to measure the diameter in a perpendicular direction?

Which precaution is essential to minimize the risk of introducing parallax errors in the measurement process when using a Screw Gauge?

According to the sources of error mentioned in the procedure for measuring diameter using a Screw Gauge, which factor is most likely to result in variations in measurements?

In the procedure for measuring diameter using a Screw Gauge, why is it important to measure the diameter of the wire at each place in two perpendicular directions and then take the mean?