Physics Medium Uploaded: 09 Jul 2026

Significant figures include:

Correct Answer: Option B — Accurately known digits and the first doubtful digit

Explanation:

Significant figures are the digits known reliably along with the first doubtful digit in a measurement.

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

Which zero is significant?

Uncertainty in a measurement is related to:

How many significant figures are in 2.40 mm?

Why are multiple readings taken in an experiment?

Precision of a measurement depends mainly on:

Which example best represents a random error?

Accuracy of a measurement means:

Which statement describes systematic error?

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