Units and Measurements — Class 11 Maharashtra HSC Physics revision notes
A 6-page visual revision sheet for Units and Measurements, written for Class 11 Maharashtra HSC Physics. Formulas, diagrams and the traps that cost marks, laid out to be read the night before rather than the term before. Free, and it opens inside CapCompass.
What this Units and Measurements sheet covers
- SI units
- The seven fundamental units
- Length
- Mass
- Time
- Temperature
- Electric current
- Luminous intensity
- Amount of substance
- Systems of units, and the two supplementary ones
- Conventions for writing SI units
- Prefixes worth knowing
- nano (n)
- micro (μ)
- milli (m)
- kilo (k)
- mega (M)
- giga (G)
- measurement of length
- large distances
- Parallax: measuring what you cannot reach
- distance of a planet, baseline b on the Earth
- diameter from angular diameter α
- for a star, the baseline is the orbit
- Units for the very large and the very small
- 1 astronomical unit (AU)
- 1 light year
- 1 parsec (pc)
- 1 fermi (fm)
- 1 angstrom
- 1 atomic mass unit (u)
- A sense of scale
- Radius of a proton
- Radius of a hydrogen atom
- Length of a typical virus
- Thickness of this paper
- Height of Mount Everest
- Radius of the Earth
- Distance to the Sun
- Distance to Andromeda
- How the metre, kilogram and second are fixed now
- Order of magnitude
- dimensional analysis
- Dimensions of common quantities
- force
- work, energy
- power
- pressure, stress
- density
- momentum, impulse
- Principle of homogeneity
- Three jobs dimensional analysis does
- Where dimensional analysis fails
- Accuracy vs precision
- Accuracy
- Precision
- error analysis
- errors in measurement
- Systematic vs random errors
- Systematic
- Random
- Errors, defined
- mean, the most probable value
- absolute error in one reading
- mean absolute error
- relative (fractional) error
- percentage error
- Combining errors
- sum or difference, Z = A ± B
- product or quotient, Z = AB or A/B
- a power, Z = fracA^pB^qC^r
- Least count, vernier and screw gauge
- vernier callipers, least count
- screw gauge, least count
- Significant figures, counting rules
- Significant figures in calculations
- Symbols
- Traps that cost marks
- Tricks that save time
How CapCompass uses this sheet
These notes are not a standalone PDF. CapCompass plans Physics chapter by chapter against your real exam dates and free hours, and when the plan reaches Units and Measurements the sheet opens inside the study block itself — at the page covering the sub-topic that block is on, with the timer still running. Revision arrives at the moment the plan says revise, instead of having to be gone looking for.