NCERT Solutions for Class 11 Physics Chapter 2

Measurement is a fundamental concept in science. A scientist would be unable to gather information, form a theory, or conduct experiments without the ability to measure. Chapter 2 Physics Class 11 discusses physical quantity units and methods of evaluating them, while the other section of the chapter discusses measurement errors and significant figures. 

The chapter covers a variety of physical units that are used quantitatively in Physics. Students will go over the international unit system and how it is used. Measuring lengths over short and long distances is also included in the chapter. Students are also introduced to mass measurement and its range. They will also learn how to measure and calculate significant numbers. The chapter concludes with a discussion of physical quantity dimensions and formulae.

After students have referred to NCERT books for Class 11 Physics, they must solve the questions listed at the end of every chapter. To help students, Extramarks offers NCERT Solutions Class 11 Physics Chapter 2. The solutions include accurate answers to all the questions that are discussed in the practise exercise of Chapter 2.

NCERT Solutions for Class 11 Physics Chapter 2 – Units and Measurement

All of the important topics covered in the chapter on Units and Measurements are discussed and summarised in NCERT Solutions for Class 11 Physics Chapter 2.

Students can look through the Class 11 Physics Chapter 2 NCERT Solutions for a complete list of topics. It is important for the students to fully understand the topics and plan ahead to set up their own schedule. Let’s take a look at the topics and subtopics covered in this chapter before diving into the detailed NCERT Solutions for Class 11 Physics Chapter 2 Units and Measurements:

2.1 Introduction

This topic expands the discussion of unit and measurement.

2.2 The International System of Units (SI)

This topic defines how earlier scientists from various countries used different measurement units. However, as time passed and international usage increased, they began to use SI (Standard Unit).

2.3 Length Measurement

This topic provides a description of the different length measurement units used around the world.

2.3.1 Measurement of Long Distances

This topic describes how to use the parallax method to measure long distances. Furthermore, the topic provides a variety of examples of how to use long distances.

2.3.2 Estimation of Very Small Distances: Size of a Molecule

This topic explains how to use a small unit to quantify a molecule’s distance.

2.3.3 Range of Lengths

This topic defines the use of such a unit that aids in the measurement of the lengths of objects spread throughout the universe.

2.4 Mass Measurement

The mass of an object is its weight, and this topic explores the various units of mass measurement.

2.4.1 Range of Masses 

This term refers to all objects in the universe that have a fixed mass and can be measured using these units.

2.5 Measurement of Time

This topic discusses the atomic time standard, which is used to calculate the atomic clock and the caesium clock.

2.6 Accuracy, Precision of Instruments and Errors in Measurement

This topic first defines errors and the mistakes we make that cause 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 section defines all three errors and their effects on the results.

2.6.2 Error Combination

This topic defines the error that we make when performing multiple measurements.

• A summing or difference error
• A product’s or a quotient’s error
• Error when a measured quantity is raised to a power

2.7 Significant Figures

This is the combination of the first uncertain digit and the reliable digit. Furthermore, this topic contains a number of other points concerning significant figures.

2.7.1 Rules of Arithmetic Operations with Significant Figures 

The section discusses arithmetic operations rules.

2.7.2 Rounding off Uncertain Digits

This section defines how uncertain digits need to be rounded off. 

2.7.3 Rules of Determining the Uncertainty in the Results of Arithmetic Calculations

This topic defines the rules that help to govern the uncertainty of the results of mathematical calculations.

2.8 Physical Quantity Dimensions

The scope of physical quantities is defined in this topic.

2.9 Dimensional Formulae and Dimensional Equations 

This topic explains how to equitize a physical quantity using dime national equations and formulas.

2.10 Dimensional Analysis and Its Applications

This topic defines the various applications that can be used to analyse physical dimensions.

2.10.1 Checking the Dimensional Consistency of Equations 

This topic evaluates the dimensional consistency of equations.

2.10.2 Deducing Relationships Among Physical Quantities 

This topic defines how we can use physical quantity relationships to reason.

As explained in Chapter 2 Physics Class 11, Physics is a quantitative science based on the measurement of physical quantities. As base or fundamental quantities, certain physical quantities have been chosen (such as the amount of substance, electric current, length, mass, thermodynamic temperature, time, and luminous intensity). Students can access the solutions for this chapter by clicking the download button given below.

Access NCERT Solutions for Physics Chapter 2 – Units and Measurement

Solutions

NCERT Solutions for Class 11 Physics Chapter 2 – Units and Measurement

The Chapter 2 Physics Class 11 will reinforce your fundamental understanding of unit, base units, derived units, system of units, and other topics. Students will understand the need for an international system of units and how they are decided. The complexities of units and measurement will be thoroughly addressed in this chapter. Units are used to measure various dimensions such as length, width, mass, and so on. Through this chapter, you will learn about the parallax method, the parallax angle, and other methods for measuring length. Alternative methods for measuring length and estimating very small distances, such as the size of a molecule, will also be covered.

In the same way, this chapter will teach you how to measure time, accuracy, and precision of instruments. Various instruments are used to measure various dimensions. Students will become adept at using a pendulum clock, a Vernier calliper, a scale, and other instruments to measure physical quantities at the micro and macro levels. This chapter also discusses small and large ranges of length and mass measurement. Similarly, identifying errors during measurements, such as absolute errors, zero errors, and so on will also be taught. 

Benefits of the NCERT Solutions for Class 11 Physics Chapter 2

NCERT Solutions Class 11 Physics Chapter 2 (Units and Measurements) include all questions with detailed explanations and solutions. This will help students clear up any questions they may have and improve their application skills as they prepare for board exams. The detailed, step-by-step solutions will assist students in understanding the concepts and solve any confusions they may have.

The following are the advantages of using the NCERT Solutions for Class 11 Physics Chapter 2:

1. Fully-solved answers have been provided to all of the questions in the NCERT textbook.
2. Simple, easy-to-understand language is used to make learning enjoyable for students.
3. After conducting extensive research on each concept, professionals prepare the solutions.
4. Apart from their Term – I exams, students can also prepare for various competitive exams such as JEE, NEET and so on.
5. Solutions are available in chapter and exercise format to assist students in learning the concepts.