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Chapter 1: Units and Measurement

NCERT Class 11 Physics, Part I, Chapter 1. 4 lessons, 8 narrated 3D videos, 7 simulations and 8 quiz questions, following the textbook section by section.

• Physical quantities and SI unitsNCERT §1.1–1.2 · 2 narrated 3D videos, 1 interactive simulation and 2 quiz questionsHow long is a cricket pitch? How heavy is the ball? How long does one over take? Every answer is a number with a unit.
• Significant figuresNCERT §1.3 · 2 narrated 3D videos, 2 interactive simulations and 2 quiz questionsMeasure a pencil with your school ruler. The tip lands between 7.3 and 7.4 centimetres, a little closer to 7.3.
• Dimensions of physical quantitiesNCERT §1.4–1.5 · 2 narrated 3D videos, 1 interactive simulation and 2 quiz questionsHere’s a powerful idea: every physical quantity, however complicated, is built from a few base quantities.
• Dimensional analysisNCERT §1.6 · 2 narrated 3D videos, 3 interactive simulations and 2 quiz questionsCan you add 5 metres to 3 seconds? Of course not. You can only add, subtract or equate quantities of the same kind.