Units and Measurements
CBSE · Class 11 · Physics
Summary of Units and Measurements for CBSE Class 11 Physics. Key concepts, important points, and chapter overview.
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Overview
Measurement compares a physical quantity with a standard unit. Physics uses a small set of base quantities and base units to describe all other quantities. The SI system is the internationally accepted system and includes seven base units. Measured values must be written with proper significant figu
Key Concepts
Measurement of any physical quantity involves
Measurement of any physical quantity involves comparison with a basic, arbitrarily chosen, internationally accepted reference standard called unit. Th
The fundamental or base quantities
The fundamental or base quantities are length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity. T
Quantities obtained from base quantities
Quantities obtained from base quantities are derived quantities, and their units are derived units.
The SI system is the internationally
The SI system is the internationally accepted system of units. It was developed by BIPM in 1971 and revised by the General Conference on Weights and M
Radian and steradian are dimensionless SI
Radian and steradian are dimensionless SI-recognised units. The radian is used for plane angle and the steradian for solid angle.
Learning Objectives
- Understand the meaning of measurement, unit, base unit, derived unit, and system of units
- Recognise the SI system and its seven base units
- Use commonly retained units such as minute, hour, degree, litre, tonne, bar, and others
- Apply rules of significant figures in measurements and calculations
- Round off values correctly and understand relative error
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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