NCERT Solutions for Class 11 Physics Chapter 2 – Units and Measurement
Class 11 physics is pretty tough and difficult to understand by students. Moreover, there are certain topics that completely bounce off over students head. So to help them know the topic we have prepared NCERT Solutions for Class 11 Physics Chapter 2 that will help them with the topic in which they face difficulty.
Besides, these NCERT Solutions are prepared by our panel of professionals who have developed it after thorough research. In addition, they are in easy language so that students can easily get their meaning.
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CBSE Class 11 Physics Chapter 15 Units and Measurement NCERT Solutions
Unit refers to the international standards that are accepted worldwide. While on the other hand, measurement refers to the use of the unit for measuring the quantity. In this NCERT Solutions for Class 11 Physics Chapter 2, we will discuss all the topic of the chapter in brief and in an easily understandable language so that students can get what the content of the chapter.
Subtopics covered under NCERT Solutions for Class 11 Physics Chapter 15
2.1 Introduction
This topic discusses what is unit and measurement which we have discussed above.
2.2 The International System of Units
This topic defines that earlier scientist of different countries uses the different unit for measurement. But with time and international usage, they started using SI (Standard Unit).
2.3 Measurement of Length
This topic overview the different unit of measuring the length that is used worldwide.
2.3.1 Measurement of Large Distances- This topic defines the use of parallax method for measuring long distances. Besides, the topic provides various examples of using large distances.
2.3.2 Estimation of very Small Distances: Size of a Molecule- This topic defines the use of the small unit by which we can measure the distance of the molecule.
2.3.3 Range of Lengths- this topic defines the use of such unit that helps to measure the lengths of objects that are spread in this wide universe.
2.4 Measurement of Mass
The weight of any object is its mass and this topic discusses the various unit of measurement of mass.
2.4.1 Range of Masses- It refers to all those objects that are spread over the universe that has a fixed mass and can be measured using these units.
2.5 Measurement of Time
This topic defines the atomic standard of time that is used for measuring the atomic clock and cesium clock.
2.6 Accuracy, Precision of Instruments and Errors in Measurement
This topic firstly defines what are errors and the mistakes we do which causes the errors.
- Systematic Errors
- Instrumental errors
- Imperfection in experimental technique or procedure
- Personal errors
- Random Errors
- Least Count Errors
2.6.1 Absolute Error, Relative Error, and Percentage Error- This topic defines all the three errors and how they affect the results.
2.6.2 Combination of Errors- This topic defines the error that we do while performing several measurements
- An error of a sum or a difference
- The error of a product or a quotient
- Error in case of a measured quantity raised to a power
2.7 Significant Figures
This refers to the first uncertain digit plus the reliable digit. Moreover, this topic several other points related to significant figures.
2.7.1 Rules of Arithmetic Operations with Significant Figures- The topic define the rules related to the arithmetic operations.
2.7.2 Rounding off the Uncertain Digits- This topic defines the rule of rounding off of unclear digits.
2.7.3 Rules of Determining the Uncertainty in the Results of Arithmetic Calculations- This topic defines the rules that help to govern the doubt of the results of mathematics calculations.
2.8 Dimensions of Physical Quantities
This topic defines the scope of physical quantities.
2.9 Dimensional Formulae and Dimensional Equations
This topic describes the dime national equations and formula that we use to equitize a physical quantity.
2.10 Dimensional Analysis and its Applications
This topic defines the various applications by which we can analyze the physical quantities of a dimension.
2.10.1 Checking the Dimensional Consistency of Equations- This topic checks the consistency of dimensional equations.
2.10.2 Deducing Relation among the physical Quantities- This topic defines how we can use the relation of the physical quantities for reasoning.
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