Ncert Solutions for class 11 physics Chapter 2 UNITS AND MEASUREMENTS is prepared by CBSE STUDENT eCARE Expert to score good marks in class 11. Class 11 physics Chapter 2 UNITS AND MEASUREMENTS contains many topics which are very important to score good in class 11. There are some important topics of Chapter 2 UNITS AND MEASUREMENTS is mentioned below:
A unit of measurement is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity. For example, a length is a physical quantity. The metre is a unit of length that represents a definite predetermined length.
|2.2||The International System Of Units|
|2.3||Measurement Of Length|
|2.4||Measurement Of Mass|
|2.5||Measurement Of Time|
|2.6||Accuracy, Precision Of Instruments And Errors In Measurement|
|2.8||Dimensions Of Physical Quantities|
|2.9||Dimensional Formulae And Dimensional Equations|
|2.10||Dimensional Analysis And Its Applications|
Scientists gather information with their senses like eyes, ears, etc. and make observations. Some observations are simple like figuring out the texture and colour while other observations may be complex for which they may need to take measurements. Measurement is one of the fundamental concepts in science. Without the ability to measure, a scientist wouldn’t be able to gather information and form a theory or conduct experiments. In this chapter, the units of physical quantities and methods of evaluating them are discussed, while the other section of the chapter deals with the errors that can occur while taking measurement and significant figures.
In the SI system, there are seven fundamental units: kilogram, meter, candela, second, ampere, kelvin, and mole.
A unit is any measurement that there is 1 of. So 1 meter is a unit. And 1 second is also a unit. And 1 m/s (one meter per second) is also a unit, because there is one of it.
Measurement is to find a number that shows the amount of something. A measurement unit is a standard quantity used to express a physical quantity.
The seven SI base units, which are comprised of: