# CLASS – 9 (PHYSICS, CHEMISTRY, BIOLOGY & MATHEMATICS)

Doubtbox is the latest innovative product from the founders of eTutor, which is used by half a million students across the globe. This Interactive Digital Content Repository has 8000 animated topics and one lakh questions with answers for Classes 1-12 .

Doubtbox pen drive, an excellent tuition master at home, facilitating self learning by students, available for Classes 1-12, based on CBSE syllabus, with effective blending of ICSE and State Boards syllabus. Once they are set up in the home computer/lap top, students can study any lesson according to their convenience and do home work easily, watching the lessons enriched with multimedia. All the topics are explained with quality animations, graphics, pictures and diagrams along with audio explanations. Students will enjoy lessons as if seeing an animated, topic-based film.

**System Requirements:**

- Processor – Minimum:1 GHZ, RAM – Minimum:2 GB
- Disk Space – Minimum 10 GB Free space
- Screen resolution – 1280 x 720 or above
- Operating System – Windows 7 or above

**Doubtbox Features:**

- Latest syllabus
- Animated video lessons
- Exciting visuals
- Audio explanations
- Multiple choice questions
- Assessments
- Time bound test
- Model test papers
- Previous years question papers
- NCERT solutions

## PRODUCT DESCRIPTION

**Topics Covered in Doubtbox Educational Pen Drive**

Chapter 1. The Fundamental Units of Life

What are living organisms made up of?, What is a Cell Made Up of ? What is the Structural Organisation of a Cell?- Plasma Membrane or Cell Membrane, Cell wall, Nucleus, Cytoplasam, Cell Organelles

Chapter 2. Tissues

Are plants and animals made of same types of tissues?, Plant tissues-Meristematic Tissue

Animal Tissues-Epithelial tissue, Connective tissue, Muscular tissue, Nervous Tissue

Chapter 3. Diversity in Living Organisms

What is the basis of Classification of Organisms, Classification and Evolution, The Hierarchy of Classification-Groups, Plantae, Animalia, Nomenclature

Chapter 4.Why do we fall ill

Health and its Failure, Diseases and its Causes, Infectious Diseases

Chapter 5. Improvement in Food Resources

Improvement in Crop Yields- Crop Variety Improvement, Crop Production Management,

Animal Husbandry-Cattle Farming, Poultry Farming, Fish Production, Bee Keeping

Chapter 6. Natural Resources

The Breath of life: Air, Water: A Wonder Liquid, Mineral Riches in the Soil, Biogeochemical Cycles, Ozone Layer

Chapter 1. Matter in our Surroundings

Physical Nature of Matter, Characteristics of Matter, State of Matter, Can Matter Change its State?, Evaporation

Chapter 2. Is Matter around Us Pure?

What is a Mixture?, What is a Solution?, Separating the Components of a Mixture, Physical and Chemical Changes, What are the types of Pure Substances?

Chapter 3. Atoms and Molecules

What is an Atom?, What is a Molecule?, Writing Chemical Formulae, Molecular mass and Mole Concept

Chapter 4. Structure of the Atom

Charged Particles in Matter, The Structure of an Atom, How are Electrons Distributed in Different Orbits (Shells), Valency, Atomic and Mass Number, Isotopes

Chapter 1. Motion

Describing Motion, Measuring the Rate of Motion, Rate of Change of Velocity, Graphical Representation of Motion, Equations of Motion by Graphical method, Uniform Circular Motion

Chapter 2. Force and Laws of Motion

Balanced and Unbalanced Forces, Newton’s First law of Motion, Inertia and Mass, Third Law of Motion, Conservation of Momentum

Chapter 3. Gravitation

Gravitation, Free Fall, Mass, Weight, Thrust and Pressure, Archimedes’ Principle, Relative Density

Chapter 4. Work, Energy and Power

Work-Not much “work” in spite of Working Hard, Scientific Conception of Work, Work Done by a Constant Force, Energy-Forms of Energy, Kinetic Energy, Potential Energy, Potential energy of an object at a Height, Are Various Energy Forms Interconvertible?, Law of Conservation of Energy, Rate of Doing Work?- Commercial Unit of Energy

Chapter 5. Sound

Production of Sound, Propagation of Sound, Reflection of Sound – Echo, Reverberation, Uses of Multiple Reflection of Sound, Range of Hearing, Structure of Human Ear

Chapter 1. Number System

Introduction, Irrational Numbers, Real Numbers and their Decimal Expansions, Representing Real numbers on the Number Line, Operations and Real Numbers, Laws of Exponents for Real Numbers, Summary

Chapter 2. Polynomials

Introduction, Polynomials in One Variable, Zeroes of a Polynomial, Remainder Theorem, Factorisation of Polynomials, Algebraic Identities, Summary

Chapter 3. Coordinate Geometry

Introduction, Cartesian System, Plotting a Point in the Plane if its Coordinates are Given, Summary

Chapter 4. Linear Equations in Two Variables

Introduction, Linear Equations, Solution of a Linear Equation, Graph of a Linear Equation in Two Variables, Equations of Lines Parallel to the x-axis and y-axis, Summary

Chapter 5. Introduction To Euclid’s Geometry

Introduction, Euclid’s Definitions, Axioms and Postulates, Equivalent Versions of Euclid’s Fifth Postulate, Summary

Chapter 6. Lines and Angles

Introduction, Basic Terms and Definitions, Intersecting Lines and Non-intersecting Lines, Pairs of Angles, Parallel Lines and a Transversal, Angle Sum Property of a Triangle, Summary

Chapter 7. Triangles

Introduction, Congruence of Triangles, Criteria for Congruence of Triangles, Some Properties of a Triangle, Some More Criteria for Congruence of Triangles, Inequalities in a Triangle, Summary

Chapter 8. Quardilaterals

Introduction, Angle Sum Property of a Quadrilateral, Types of Quadrilaterals, Properties of a Parallelogram, Another Condition for a Quadrilateral to be a Parallelogram, The Mid-point Theorem, Summary

Chapter 9. Areas of Parallelograms and Traingles

Introduction, Figures on the Same Base and Between the Same Parallels, Parallelograms on the Same Base and Between the same Parallels, Triangles on the same Base and between the same Parallels, Summary

Chapter 10. Circles

Introduction, Circles and Its Related Terms: A Review, Angle Subtended by a Chord at a Point,

Perpendicular from the Centre to a Chord, Circle through Three Points, Equal Chords and Their Distances from the Centre, Angle Subtended by an Arc of a Circle, Cyclic Quadrilaterals, Summary

Chapter 11. Constructions

Introduction, Basic Constructions, Some Constructions of Triangles, Summary

Chapter 12. Heron’s Formula

Introduction, Area of a Triangle by Heron’s Formula, Application of Heron’s Formula in Finding Areas of Quadrilaterals, Summary

Chapter 13. Surface Areas and Volumes

Introduction, Surface Area of a Cuboid and a Cube, Surface Area of a Right Circular Cylinder,

Surface Area of a Right Circular Cone, Surface Area of a Sphere, Volume of a Cuboid, Volume of a Cylinder, Volume of a Right Circular Cone, Volume of a Sphere, Summary

Chapter 14. Statistics

Introduction, Collection of Data, Presentation of Data, Graphical Representation of Data, Measures of Central Tendency, Summary

Chapter 15. Probability

Introduction, Probability – an Experimental Approach, Summary

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