Measurement
Foundations of physical quantities, SI base & derived units, dimensional analysis, precision laboratory measuring instruments (Vernier, Micrometer, Spherometer, Travelling Microscope), measurement errors, and vectors.
Measurement — Lessons (8)
Nature of Physics & Scientific Investigation
Scope and branches of physics, qualitative observations versus quantitative inferences, variables (independent, dependent, controlled), hypothesis formulation, and applications of physics in human progress.
Physical Quantities, SI Units, and Prefixes
Fundamental and derived physical quantities, the 7 SI base units, supplementary and derived units, standard decimal prefixes (femto to giga), scientific notation, and unit conversions.
Dimensional Analysis & Physical Equations
Dimensions of physical quantities [M], [L], [T], principle of dimensional homogeneity, testing the validity of physical equations, deriving relationships between quantities, and limitations of dimensional methods.
Measuring Instruments & Least Count
Operating principles, least count determination, zero errors (positive and negative), zero corrections, and readings for Vernier calipers, micrometer screw gauges, spherometers, and travelling microscopes.
Errors and Uncertainty Analysis
Systematic versus random errors, absolute error, fractional and percentage uncertainty, error combination rules (addition, subtraction, multiplication, division, powers), and significant figure rules.
Vectors and Scalars
Distinction between scalar and vector quantities, geometric representation, vector addition (triangle law, parallelogram law), subtraction, and resolution into mutually perpendicular rectangular components.
Practical Laboratory Investigations
Interactive virtual laboratory covering all 5 official NIE Grade 12 practicals: (1) Vernier Calipers (Hollow Cylinder), (2) Micrometer Screw Gauge (Coin), (3) Spherometer (Radius of Curvature), (4) Travelling Microscope (Rubber Tube), (5) Density of Regular Solid.
Unit 1 Comprehensive Assessment
Summative 20-question randomized evaluation testing all 5 syllabus competencies with instant grading, physical explanations, and targeted lesson recap links.