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11th Physics Notes - Units and Measurement - NCERT Solutions for class 11th science

11th Physics Notes - Units and Measurement - NCERT Solutions for class 11th Science

Takshila Learning offers online CBSE exams coaching for Class 1 to 12 to the students so that they can easily score good marks in CBSE exams. We offer a complete package of 11th Class Science that includes Physics, Biology, and Chemistry video lectures, question bank, virtual experiments, NCERT solutions of Class 11.

In this article, we have discussed the Units and Measurement, it covers the Chapter 2: Units and Measurement of Physics Class 11.
Unit: Measurement of any physical quantity involves comparison with any certain basic, arbitrarily chosen, internationally accepted reference standard known as a unit.
Watch recorded lectures on Class 11 Physics – Units and Measurement.
Fundamental (or Base) units & Derived units:
The units for the base or fundamental quantities are called base or fundamental units.
There are 7 fundamental quantities and they are:
  • Length
  • Mass
  • Time
  • Electric Current
  • Temperature
  • Amount of Substance
  • Luminous Intensity

The units of all other physical quantities can be expressed as combinations of the base units. Such units obtained for the derived quantities are called derived units.
The system of Units:
A complete set of units, both the base units and derived units, is known as the system of units.
Three common systems of units frequently used in Physics are:
  • CGS system (In CGS system, we use centimeter, gram and second respectively)
  • FPS (or British) system (In FPS system, we use foot, pound and second respectively)
  • MKS system (In MKS system, we use metre, kilogram and second respectively)


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