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Category: Senior School Class 8 - 10.

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.

**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

**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

**Topics Covered in doubtbox Educational Pen Drive**

**BIOLOGY**

Chapter 1. Life Process

What are Life Processes?, Nutrition, Respiration, Transportation, Excretion

Chapter 2. Control and Co-ordination

Animals- Nervous System, What Happens in Reflex Actions, Human Brain, How are these Tissues Protected?,How does the Nervous Tissue cause Action?, Coordination in Plants,Immediate Response to Stimulus, Movement Due to Growth, Hormones in Animals

Chapter 3. How do Organisms Reproduce

Reproduction, Modes of Reproduction used by Single Organisms- Fission, Fragmentation, Regeneration, Budding, Vegetative Propagation, Spore Formation, Sexual Reproduction

Chapter 4. Heredity and Evolution

Accumulation of Variation during Reproduction, Heredity, Evolution, Speciation, Evolution and Classification, Evolution should not be Equated with ‘PROGRESS’

Chapter 5. Our Environment

What Happens when We add Our Waste to the Environment?, Eco System and its Components, How do Our Activities Affect the Environment?

Chapter 6. Management of Natural Resources

Why do We need to Manage Our Resources?, Forests and Wild Life, Water for All, Coal and Petroleum, An Overview of Natural Resource Management

**CHEMISTRY**

Chapter 1. Chemical Reactions and Equations

Chemical Equations – Writing a Chemical Equation,Balanced Chemical Equations, Types of Chemical Reactions-Combination Reaction, Decomposition Reactions, Displacement Reactions, Double Displacement Reactions, Oxidation and Reduction,, Effects of Oxidation Reaction in Everyday Life-Corrosion, Rancidity

Chapter 2. Acids Bases and Salts

Under Standing the Chemical Properties of Acids and Bases, What do all Acids and all Bases have in Common?, How Strong are Acid or Base Solutions?, More About Salts

Chapter 3. Metals and Non Metals

Physical Properties, Chemical Properties of Metals, How do Metals and Non-Metals React?, Occurence of Metals , Corrosion

Chapter 4. Carbon and its Compounds

Bonding in Carbon- The Covalent bond, Versatile Nature of Carbon, Versatile Nature of Carbon, Chemical Properties of Carbon Compounds, Some Important Carbon Compounds – Ethanol and Ethanoic Acid, Soaps and Detergents

Chapter 5. Periodic classification of Elements

Making Order out of Chaos – Early Attempts at the Classification of Elements, Making Order out of Chaos – Mendeleev’s Periodic Table, Making Order out of Chaos – The Modern Periodic Table

**PHYSICS**

Chapter 1. Reflection and Refraction

Reflection of Light, Spherical Mirrors, Refraction of Light

Chapter 2. The Human Eye and the Colourful World

The Human eye, Defects of Vision and their Correction, Refraction of Light through a Prism, Dispersion of White Light by a Glass Prism, Atmospheric Refraction, Scattering of Light

Chapter 3. Electricity

Electric Current and Circuit, Electric Potential and Potential difference, Circuit diagram, OHM’S Law, Factors on which the resistance of a conductor depends, Resistance of a system of Resistors, Heating effect of Electric Current, Electric power

Chapter 4. Magnetic Effect of Electric Current

Magnetic Field and Field Lines, Magnetic Field due to a Current Carrying conductor, Force on a Current Carrying Conductor in a Magnetic Field, Electric Motor, Electro Magnetic Induction, Electric Generator, Domestic Electric Circuits

Chapter 5. Sources of Energy

What is a Good Source of Energy, Conventional Sources of Energy, Alternative or Non-Conventional Sources of Energy, Environmental Consequences, How long will an Energy Source Last Us?

**MATHEMATICS**

Chapter 1. Real Numbers

Introduction, Euclid’s Division Lemma, The Fundamental Theorem of Arithmetic, Revisiting Irrational Numbers, Revisiting Rational Numbers and Their Decimal Expansions, Summary

Chapter 2. Polynomials

Introduction, Geometrical Meaning of the Zeroes of a Polynomial, Relationship between Zeroes and Coefficients of a Polynomial, Division Algorithm for Polynomials, Summary

Chapter 3. Pair of Linear Equations in Two Variables

Introduction, Pair of Linear Equations in Two Variables, Graphical Method of Solution of a Pair of Linear Equations, Algebraic Methods of Solving a Pair of Linear Equations, Equations Reducible to a Pair of Linear Equations in Two Variables, Summary

Chapter 4. Quadratic Equations

Introduction, Quadratic Equations, Solution of a Quadratic Equation by Factorisation, Solution of a Quadratic Equation by Completing the Square, Nature of Roots, Summary

Chapter 5. Arithmetic Progressions

Introduction, Arithmetic Progressions, nth Term of an AP, Sum of First n Terms of an AP, Summary

Chapter 6. Triangles

Introduction, Similar Figures, Similarity of Triangles, Criteria for Similarity of Triangles, Areas of Similar Triangles, Pythagoras Theorem, Summary

Chapter 7. Coordinate Geometry

Introduction, Distance Formula, Section Formula, Area of a Triangle, Summary

Chapter 8. Introduction to Trigonometry

Introduction, Trigonometric Ratios, Trigonometric Ratios of Some Specific Angles, Trigonometric Ratios of Complementary Angles, Trigonometric Identities, Summary

Chapter 9. Some Applications of Trigonometry

Introduction, Heights and Distances, Summary

Chapter 10. Circles

Introduction, Tangent to a Circle, Number of Tangents from a Point on a Circle, Summary

Chapter 11. Constructions

Introduction, Division of a Line Segment, Construction of Tangents to a Circle, Summary

Chapter 12. Areas Related to Circles

Introduction, Perimeter and Area of a Circle — A Review, Areas of Sector and Segment of a Circle, Areas of Combinations of Plane Figures, Summary

Chapter 13. Surface Areas and Volumes

Introduction, Surface Area of a Combination of Solids, Volume of a Combination of Solids, Conversion of Solid from One Shape to Another, Frustum of a Cone, Summary

Chapter 14. Statistics

Introduction, Mean of Grouped Data, Mode of Grouped Data, Median of Grouped Data, Graphical Representation of Cumulative Frequency Distribution, Summary

Chapter 15. Probability

Introduction, Probability — A Theoretical Approach, Summary

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