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JEE • Physics

Error and Measurement

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table

Least Count and Significant Figures

The source lists instrument least counts and key significant-figure rules.

InstrumentLeast count

mm scale

1 mm1\ \text{mm}

Vernier

0.1 mm0.1\ \text{mm}

Screw gauge

0.1 mm0.1\ \text{mm}

Stop watch

0.1 s0.1\ \text{s}

Temperature thermometer

0.1∘C0.1^\circ\text{C}

Notes

  • Non-zero digits are significant.

  • Zeros between two non-zero digits are significant.

  • Change of units cannot change significant figures.

  • For numbers less than one, zeros after decimal and before first non-zero digit are insignificant.

  • Trailing zeros without a decimal point are not significant.