Units and Measurements
Madhya Pradesh Board · Class 11 · Physics
Quick revision notes for Units and Measurements — Madhya Pradesh Board Class 11 Physics. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Introduction to Measurement and Units
- Measurement involves comparison with a reference standard called a unit
- Physical quantities are expressed as a number accompanied by a unit
- Units are classified as fundamental (base) units and derived units
International System of Units (SI)
- SI is the internationally accepted system of units
- Based on seven base quantities: length, mass, time, electric current, temperature, amount of substance, luminous intensity
- SI uses decimal system making conversions simple
Significant Figures
- Significant figures indicate precision of measurement
- Include all reliable digits plus first uncertain digit
- Location of decimal point doesn't affect number of significant figures
Rules for Arithmetic Operations with Significant Figures
- Multiplication/Division: Result has same significant figures as least precise measurement
- Addition/Subtraction: Result has same decimal places as measurement with least decimal places
- Retain one extra digit in intermediate calculations
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