CBSE Class 9 Notes 2026-27

Benefit

Explanation

Faster Revision

Covers key points in 10–15 minutes per chapter

Exam-ready Format

Organised by topics, terms, formulae, and diagrams

Memory Aid

Short notes reinforce retention better than re-reading

Useful for Periodic Tests

Quick reference without opening full textbooks

Foundation for Class 10

Class 9 concepts reappear in Class 10 Board exams

Chapter

Key Concepts to Note

Number Systems

Types of numbers, rational/irrational, laws of exponents, surds

Polynomials

Degree, types, Remainder Theorem, Factor Theorem, factorisation methods

Coordinate Geometry

Cartesian plane, quadrants, plotting ordered pairs

Linear Equations in 2 Variables

ax + by + c = 0, infinite solutions, graph as a straight line

Introduction to Euclid's Geometry

Axioms, postulates, theorems distinction

Lines and Angles

Angle pairs, transversal properties, parallel lines

Triangles

Congruence criteria (SAS, ASA, AAS, SSS, RHS), inequalities

Quadrilaterals

Properties of parallelogram, rhombus, rectangle, square, mid-point theorem

Circles

Chord, arc, angle subtended, cyclic quadrilateral

Heron's Formula

Area of triangle using semi-perimeter

Surface Areas & Volumes

Formulae for cube, cuboid, cylinder, cone, sphere

Statistics

Mean, median, mode, frequency distribution, bar graph, histogram

Probability

Experimental probability, trials, events

Chapter

Key Points

Motion

Distance vs displacement, speed vs velocity, acceleration, equations of motion (v=u+at, s=ut+½at², v²=u²+2as), distance-time and velocity-time graphs

Force & Laws of Motion

Newton's 3 laws, inertia, momentum, F = ma, action-reaction

Gravitation

Universal law (F = Gm₁m₂/r²), free fall, g = 9.8 m/s², weight, Archimedes' principle, buoyancy

Work & Energy

W = Fs cosθ, kinetic energy (½mv²), potential energy (mgh), law of conservation of energy, power (P = W/t)

Sound

Longitudinal waves, frequency, amplitude, speed of sound (343 m/s in air at 25°C), reflection, SONAR

Chapter

Key Points

Matter in Our Surroundings

Solid, liquid, gas; interconversion; latent heat; evaporation causes cooling

Is Matter Around Us Pure

Pure substances vs mixtures; solutions, colloids, suspensions; separation methods

Atoms and Molecules

Laws of chemical combination, Dalton's atomic theory, atomic mass, molecular mass, mole concept (1 mole = 6.022 × 10²³)

Structure of the Atom

Thomson, Rutherford, Bohr models; atomic number, mass number; valency; isotopes, isobars

Chapter

Key Points

Fundamental Unit of Life

Cell theory, prokaryotic vs eukaryotic, plant vs animal cell, organelles and functions

Tissues

Meristematic & permanent tissues in plants; epithelial, connective, muscular, nervous in animals

Diversity in Living Organisms

Basis of classification, five kingdoms, nomenclature (binomial), major phyla

Why Do We Fall Ill

Causes of disease, infectious vs non-infectious, prevention, immunity

Natural Resources

Air, water, soil, biogeochemical cycles (carbon, nitrogen, water)

Improvement in Food Resources

Crop improvement, manure vs fertiliser, animal husbandry, aquaculture

Chapter

Key Points

French Revolution

Causes (financial crisis, inequality), events (Bastille, Constitution), Napoleon, legacy

Socialism & Russian Revolution

Capitalism vs socialism, Lenin, Bolshevik Revolution 1917, Stalin

Nazism and Rise of Hitler

Weimar Republic's failure, Hitler's ideology, anti-Semitism, Holocaust

Forest Society and Colonialism

Deforestation, scientific forestry, rebellion in Bastar and Java

Pastoralists in the Modern World

Nomadic herding, colonial impact, Maasai and Indian pastoralists

Chapter

Key Points

India – Size & Location

Latitudinal extent (8°4'N to 37°6'N), 29 states, central location advantage

Physical Features

Himalayan ranges, Northern Plains, Peninsular Plateau, Coastal Plains, Islands

Drainage

Himalayan vs Peninsular rivers, river systems, tributaries

Climate

Factors affecting climate, monsoon mechanism, seasons

Natural Vegetation & Wildlife

Types of vegetation, biodiversity, endangered species

Chapter

Key Points

Democracy

Definition, features, why democracy

Constitutional Design

South Africa's constitution, Mandela, Preamble to Indian Constitution

Electoral Politics

Elections, ECI, fair elections, reform

Working of Institutions

Parliament, executive, PM, President, judiciary

Democratic Rights

Fundamental rights, enforcement, NHRC

Chapter

Key Points

Village Palampur

Economic activities, farming, non-farm work, capital, labour

People as Resource

Human capital, education, health, unemployment types

Poverty as a Challenge

Poverty line, causes, NSSO data, government programmes

Food Security

Food security concept, PDS, Green Revolution, role of cooperatives

Component

What to Note

Beehive Chapters

Theme, characters, message, important extracts

Moments Stories

Plot summary, central idea, character analysis

Grammar Rules

Tenses (all 12), voice, narration, modals, determiners

Writing Formats

Formal/informal letter formats, notice, article, story

Poem Analysis

Poetic devices (metaphor, simile, alliteration), central theme

Technique

How to Apply

Cornell Method

Divide page: notes on right, key words/questions on left, summary at bottom

Mind Maps

Central concept in the middle, branches for sub-topics

Flowcharts

Ideal for processes (water cycle, nitrogen cycle, cell division)

Flashcards

Definitions, formulae, dates – one card per concept

Keyword Notes

Bullet points with just keywords, not full sentences

Type

Best For

Timing

Detailed Notes

First reading of a new chapter

When studying in the regular session

Short/Revision Notes

Quick recall of key points

Before periodic tests and exams

Formula Sheets

Science and Maths formulas only

Daily revision during exam month