What does “Significant figures” actually mean in Units, Dimensions & Measurement, and why does it matter for JEE?
the digits in a measurement that actually carry meaning, reflecting the instrument's precision.
In simple words: the digits in a measurement that actually carry meaning, reflecting the instrument's precision. Getting Significant figures clear matters because JEE questions on Units, Dimensions & Measurement usually test this idea directly, not just a formula you memorised.
Key point
Significant figures
Common mistake
keeping more digits in the answer than the least-precise measurement allows.
Memory tip
in multiply/divide, the result keeps the least number of significant figures.
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