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Units and Measurement
Question
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The mean diameter of a thin brass rod is to be measured by vernier callipers.

Why is a set of 100 measurements of the diameter expected to yield a more reliable estimate than a set of 5 measurements only?

Answer

A set of 100 measurements will yield a more reliable estimate because as the number of observations increases, the probable error decreases.

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Some More Questions From Units and Measurement Chapter

Does the numerical factor in the quantitative measurement depend on the system of unit used?

Is one unit sufficient to measure a physical quantity?

Can a physical quantity have two or more units? Give example.

What are fundamental quantities?

How many fundamental quantities are there in mechanics?

How many fundamental quantities are there in Physics?

Name the fundamental quantities of mechanics.

Name the different system of units in mechanics that are internationally accepted.