Physics · Class 11 · Chapter 1
Units and Measurements
10 lessons98 min6 simulations10 practice questions
Every number in physics is a comparison with a chosen standard, the unit. This chapter sets up the SI system of seven base units, the rules for reporting a measured value honestly with significant figures, how uncertainties carry into a calculated result, and the dimensions of physical quantities, which let you check an equation and even guess the form of one.
Also called: dimensional analysis · errors in measurement · significant figures
Lessons
10 lessons · 98 min
01Units: base, derived and systemsNCERT §1.17 min02The SI systemNCERT §1.27 min03Significant figuresNCERT §1.38 min04Arithmetic with significant figuresNCERT §1.3.111 min1 sim05Rounding offNCERT §1.3.27 min06Uncertainty in calculated resultsNCERT §1.3.317 min3 sims07Dimensions and dimensional formulaeNCERT §1.4, §1.510 min1 sim08Checking dimensional consistencyNCERT §1.6.17 min09Deducing relations by dimensionsNCERT §1.6.211 min1 sim10Chapter reviewMust-know facts, traps and formulas13 min
Simulations
6 in this chapter
Which digits does the calculator really know?In: Arithmetic with significant figuresPercentage errors add when you multiplyIn: Uncertainty in calculated resultsRead a vernier callipers and a screw gaugeIn: Uncertainty in calculated resultsA power multiplies the errorIn: Uncertainty in calculated resultsBuild a quantity from its dimensionsIn: Dimensions and dimensional formulaeFind the pendulum's formula from dimensions aloneIn: Deducing relations by dimensions