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Class 9 Revision Notes
Revision notes are one of the most helpful study materials for exam preparation. Considering this fact, Extramarks is providing students with Class 9 revision notes to save time and study more effectively. Revision is an unquestionably important factor to consider when selfstudying. A successful revision is crucial for good grades and academic achievement. Revision notes can also help students with lastminute preparations.
Class 9 Revision Notes, Short Key Notes
Class 9 is a stepping stone for Class 10. Students who want to achieve good marks in Class 10 must clearly understand the concepts taught in Class 9. They can practise with NCERT notes for Class 9, which are easily available on Extramarks. In addition to the Class Notes for Class 9 and NCERT Books, students should practise important questions from the CBSE Syllabus to gain a better understanding of the concepts.
Short keynotes will also assist students in learning and understanding concepts in less time, allowing for more efficient revision.
Class 9 Revision Notes
The following are the subjects that are covered in CBSE Class 9:
 English
 Mathematics
 Hindi
 Social Science
 Science
CBSE Class 9 Revision Notes
Extramarks provides CBSE Class 9 Revision Notes that students can use for academic purposes. In addition to revision notes, students should also solve questions given in chapters that will aid them in better understanding and remembering the concepts.
Class 9 Revision Notes
Extramarks provides comprehensive Class 9 Revision Notes for Science, Mathematics, Commerce, Physical Education, etc. These notes are prepared by experienced teachers in an easytounderstand format to help students prepare for the exam without much difficulty. Download the Class 9 Revision Notes available on Extramarks to review important concepts before the exam.
CBSE Notes For Class 9
As per the current term structure announced by CBSE, it is now necessary to understand key concepts to score good marks in exams. Students can use NCERT Notes for Class 9 to understand the concepts better. The CBSE revision notes will make a significant difference to your preparation.
CBSE Class 9 Science Revision Notes
Science is one of the most essential and highscoring subjects for CBSE Class 9 students. With a thorough understanding of each topic covered in the Science NCERT book, students can easily answer the questions in the exam and achieve the highest possible marks. Class 9 CBSE Science Revision Notes on Extramarks can help students improve their preparation for the exam once they’ve finished the Science course.
Chapter 1: Matters in Our Surroundings
 Anything that occupies space and has masses is called matter.
 Matters are made up of particles that move continuously.
 Particles diffuse with each other to form matter.
Chapter 2: Is matter around us pure
 Matters are made up of substances.
 The latter will be pure if it includes pure substance.
 Pure substance involves only a single component.
 Metals are the elements which is a conductors of electricity and heat and possess the properties of malleability and ductility.
 Nonmetals are the substances which do not possess the properties of metals.
Chapter 3: Atoms and Molecules
 Law of conversion of mass states that mass cannot be created or destroyed.
 Law of constant proportion states that a chemical compound involves only that element which is identical to it and has the same mass.
 Atomic theory by Dalton states that all matter is made up of atoms.
Chapter 4: Structure of Atoms
 Atoms constitute matter and also help in getting the structure of matter.
 Arms involves various particles like:
 Electron
 Proton
 Neutron
 There are various atomic models
 Thomson Model or apple pie model
 Bohr’s model
 Rutherford’s model
Chapter 5: The fundamental Unit Of Life
 Cells are known as the building units of a living being.
 There are two units of a cell, primary and structural.
 A cell consists of plasma membrane, nucleus, and cytoplasm.
Chapter 6: Tissues
 Tissues are of two types:
 Plant tissues which provide mechanical strength to the plants.
 Animal tissues which help in cell growth, and proper order of the organ system in the body.
 Plant tissues consist of
 meristematic tissue
 simple permanent tissue
 permanent tissue
Chapter 7: Diversity in Living Organisms
There are millions of living organisms on the earth and all of them are classified on some basis. All the organisms are divided into certain groups and sub groups. The various types of living organisms are
 Monera
 Fungi
 Platea
 Protista
 Animalia
Chapter 8: Motion
An object will be in motion if its position will change from one place to another. Rest is a state where the object has zero motion. There are four types of motion:
 Rotatory
 Vibratory
 Translatory
 Rectilinear
Chapter 9: Forces and Law of Motion
Force means any external energy which changes the rest position of an object to motion in a straight path.
There are two types of forces:
 Balanced
 Unbalanced
There are three laws by Newtown
 First law which states that a body will remain in rest or motion until a thru party force will be applied.
 Second law states that the rate of momentum is interlinked with the force which is applied on the object.
 Third law states that actions and reactions are interrelated to each other.
Chapter 10: Gravitation
 Gravitation is the type of attraction which lies between two objects in the universe.
 It is a force which attracts a subject towards the surface of the earth.
Chapter 11: Work and Energy
 Work is said to be done when the applied force on an object makes it move on a straight path.
 To carry out work, a force must he there, object should be on the same direction of the force
 It can be calculated by,
 W= FxS
Chapter 12: Sound
 Sound is an energy which can be heard from our ears.
 It requires a medium to travel.
 It cannot travel in vacuum.
Chapter 13: Why do we fall ill
 Health is a state of the body where it can perform physics, mental, and social activities easily.
 A person unable to perform all these activities is considered ill.
 There are two various types of diseases:
 Acute
 Chronic
 Infectious
 Non infectious
Chapter 14:Natural Resources
 The substances extracted, collected by the earth are known as natural resources
 There are three types of pollution:
 Air
 Water
 Land
Chapter 15: Improvement in Food Resources
 Improvement in food resources involves various methods
 Improvement in crops
 Changing the variety of crops
 Deciding the quantity of crops to be produced
 Manure management
 Proper Irrigation
 Fertiliser management
 Cropping chain in the field
Class 9 CBSE Mathematics Revision Notes
Mathematics is one of the essential subjects in school that require a lot of practice, revision, and, most importantly, attentiveness. Class 9 Mathematics revision notes on Extramarks include an overview of the sections, key concepts to remember, a quick explanation of each topic, and derivation of the formulas to better understand each chapter.
Chapter Wise CBSE Class 9 Mathematics Revision Notes PDFs
Chapter 1: Number System Notes
 Meaning:
 Real and natural numbers: Real numbers, which are denoted by R, are the combination of whole numbers, integers, natural numbers, rational and irrational numbers. While natural numbers are the general counting numbers from 1.
 The number system involves both natural numbers and imaginary numbers.
 Decimal expansion of real numbers
 When remainder will be zero
 When remainder is not zero
Chapter 2: Polynomials
1. Polynomial in one variable
 The equations or formulas have only one variable in it.
2. Types of polynomials
 Linear polynomial: when the polynomials are having 1° which is the greatest.
 Zero polynomials: polynomials with zero degree.
 Quadratic polynomial: when the polynomials have the degree of 2.
 Cubic polynomials: when the polynomials have the degree of 3.
3. Factorization of polynomials
 Factorization of polynomial can be written as, dividend= Quotient × Divisor + remainder
 Methods under factorization of polynomials
 By dividing the number or equation by the HCF obtained
 Through identities
 By grouping method
Chapter 3: Coordinate Geometry
 Coordinate Axes is the position which is determined when two perpendicular ones intersect with each other.
 Coordinates
Chapter 4: Linear Equation in Two Variables
 Meaning
 Linear equation is an equation which can be expressed in the form of ca+by+z=0, in which a, b, and c are real numbers.
 Solutions of linear equations
 Solution of any linear equation can he find out when LHS=RHS
Chapter 5: Euclid Geometry
 It is a geometrical approach to solve a problem.
 There are various assumptions made under euclid theory of geometry.
Chapter 6: Lines and Angles
 Concepts and meaning
 Point: small dot which does not have any length or thickness or width
 Line segment: a path that joins two points
 Collinear points: more than two or two points on a line.
 Noncollinear points: the points which don’t lie on the same line.
 Ray: a line segment that can be expanded in one path only.
 Line: a line segment that can be expanded through both directions.
 Intersecting lines: two lines meeting at one point in common.
 Plane: a platform where a point lies that connects any of the two points on the line.
 Concurrent lines: when two or more lines meet at the same point
 Angels: formed when two straight lines meet at one point in common.
Chapter 7: Triangles
 Congruent geometric figures
 Meaning: The figures have identical shapes and size are congruent figures
 Congruent triangles
 Meaning: triangles with identical shape and size are the congruent triangles
 Definition: two triangles are said to be congruent one of it’s sides are equal and same to the other side.
 Congruent circles
 Meaning: circles with same radius are the congruent circles
Chapter 8: Quadrilaterals
 Meaning
 A polygon with four sides
 Parallelogram have all equal and same sides like rectangle, square
 Trapezium have the opposite sides equal
Chapter 9: Areas of parallelogram and triangles
 Triangle
 Meaning: a figure having three lines, two dimensions, and three corners
 Parallelogram
 Meaning: A figure having the opposite sides equal.
Chapter 10: Circles
 Meaning:
 A locus of all the points in a plane fixed from a distance.
 Sector
 Area or distance between two radii and arc.
 Chord
 A straight line connecting two points in a plane
 Circumference
 Length of a circle, parameter
 Arc
 A part of the circumference
Chapter 11: Construction
 It is a process of making a geometrical figures using a ruler and a compass
 This mainly involves the construction of two figures,
 Basic construction of bisector
 Construction of triangle
Chapter 12: Herons Formula
 Area of triangle when height is given
 ½×base×height
 Area of triangle under heron’s formula
 √s(sa)(sb)(sc)
 Area of triangle through area of quadrilateral
 Divide the quadrilateral into two parts which forms two triangles
Chapter 13: Surface Area and Volume
 Cuboid
 Surface area : 2(lb+bh+hl)
 Volume: lxbxh
 Cube
 Surface area= 6l²
 Volume= l³
 Right circular cone
 Surface area
 CSA= πrl
 TSA= πr(r+l)
 Volume= 1/3πr²h
 Cylinder
 Surface area
 CSA= 2πrh
 TSA= 2πr(r+h)
 Volume= πr²h
 Sphere
 Surface area= 4πr²
 Volume = 4/3 πr³
 Spherical shell
 Surface area= 4πR²
 Volume= 4/3π(R³r³)
 Hemisphere
 Surface area
 CSA= 2πr²
 TSA= 3πr²
Chapter 14: Statistics
 Statistics can be used to collect data in cardinal or numeric forms.
 These data can be used to find solution to some questions
 There are two types of data, primary and secondary
Chapter 15: Probability
 Probability means making an estimation regarding something.
 These values are approximations and not the exact numbers.
 Probability uses various tools like trail, randomness, events, impossible events, random events , and elementary events.
Benefits of CBSE Notes of Class 9 By Extramarks
Studying with revision notes for Class 9 prepared by the Extramarks team can benefit you in a number of ways. Listed below are a few of them:
 The revision notes will assist you to sort your learning.
 They will help you to identify the important topics to study for the exams.
 They will help students remember important concepts, facts, figures and procedures that have been studied so far.
 Students who refer to these revision notes are likely to score well in their upcoming Class 9 exams.
 The wellprepared notes will also help to increase students’ confidence before the exam.
CBSE Class 9 Revision Notes
FAQs (Frequently Asked Questions)
There are 15 chapters in the Class 9 Science textbook and curriculum.
You need to have a strong knowledge of the basic concepts to score good marks in the Class 9 Mathematics examination. The revision notes can help with that to a great extent. Make sure you remember formulas (chapterwise) because it is equally important.
No, CBSE doesn’t provide revision notes for chapters. You can access Class 9 revision notes on Extramarks.
There are a total of 15 chapters in Class 9 Mathematics.