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Measurement — Revision Notes

Tamil Nadu Board · Class 9 · Science

Measurement revision notes for Tamil Nadu Board Class 9 Science: 4 topics in quick points. Part of the Tamil Nadu Board Class 9 Science syllabus.

44 questions35 flashcards2 formulas & key relations5 concepts

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A comparison chart highlighting the key differences between mass and weight, including definitions, units, constancy, and dependence on location.
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Key Topics to Revise

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1. Physical Quantities and Units

  • Physical quantity is any quantity that can be measured and has a numerical value and a unit
  • Fundamental quantities cannot be expressed in terms of other quantities - Length, Mass, Time, Temperature, Electric Current, Luminous Intensity, Amount of Substance
  • Derived quantities are expressed in terms of fundamental quantities - Area, Volume, Density, Velocity, Force, Pressure, Energy
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2. SI Units and Derived Units

  • SI System is based on 7 fundamental units and uses metric system with powers of 10
  • Length (metre): distance travelled by light in vacuum in 1/299,792,458 second
  • Mass (kilogram): defined by international prototype platinum-iridium cylinder kept at Sevres, France
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3. Unit Prefixes and Scientific Notation

  • Unit prefixes represent powers of 10 and precede unit symbols to specify magnitude
  • Large prefixes: Peta (P) = 10¹⁵, Tera (T) = 10¹², Giga (G) = 10⁹, Mega (M) = 10⁶, Kilo (k) = 10³
  • Small prefixes: Milli (m) = 10⁻³, Micro (μ) = 10⁻⁶, Nano (n) = 10⁻⁹, Pico (p) = 10⁻¹², Femto (f) = 10⁻¹⁵
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4. Rules for Writing SI Units and Symbols

  • Units named after scientists: written in lowercase (newton, pascal, joule, tesla), but symbols in uppercase (N, Pa, J, T)
  • Units not derived from proper nouns: written and symbolized in lowercase (metre = m, kilogram = kg, second = s)
  • No punctuation marks (full stops, hyphens) within or at end of unit symbols - Write '50 m' not '50 m.'

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Full Notes

Key Concepts

Physical quantities are measurable characteristicsThe International System of Units (SI)Unit prefixes are symbols placed beforeLength is the extent ofMass is the quantity of matter

Frequently Asked Questions

What are the important topics in Measurement for Tamil Nadu Board Class 9 Science?
Key topics in Measurement include Physical Quantities and Units, SI Units and Derived Units, Unit Prefixes and Scientific Notation, Rules for Writing SI Units and Symbols. Study these first, then practise questions on each for Class 9 exams.
How should I revise Measurement for Class 9 exams?
Learn the core ideas first, then work through the 44 practice questions on Measurement. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

More resources for Measurement

All Tamil Nadu Board Class 9 Science Revision Notes

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