How many significant figures are in 2.40 mm?

Which zero is significant?

Precision of a measurement depends mainly on:

Significant figures include:

Accuracy of a measurement means:

For an analogue instrument, the maximum uncertainty is commonly taken as:

If repeated readings are close to each other but not near the true value, they are:

Uncertainty in a measurement is related to:

When rounding off, if the first dropped digit is greater than 5, the retained digit is:

Why are multiple readings taken in an experiment?

Which rounding rule applies when the first dropped digit is less than 5?