CBSE Class 6 Science - Complete Course
Comprehensive NCERT notes, scientific definitions, virtual lab summaries, interactive practice tests, and textbook solutions.
CH-01 • Biology
Components of Food
📖 Revision Notes
Key Concepts & Summaries
Explore the major nutrients our bodies need — carbohydrates, fats, proteins, vitamins, and minerals — along with dietary fibre, water, balanced diets, and deficiency diseases.
1. The Five Major Nutrients
Nutrients nourish the body, maintain cellular health, and enable growth.
- Carbohydrates: Main source of instant energy (sugars like glucose and complex starch).
- Fats: Provide twice as much energy as carbohydrates; act as thermal insulators.
- Proteins: Known as body-building foods, crucial for cell repair, muscle growth, and enzymes.
- Vitamins: Protective nutrients needed in small quantities to defend against disease.
- Minerals: Inorganic elements required for strong bones, teeth, and blood production.
💡 Memory Tip: "Can Fat People View Mountains?" -> Carbohydrates, Fats, Proteins, Vitamins, Minerals!
2. Laboratory Food Tests
Standard scientific tests to detect presence of starch, proteins, and fats.
- Test for Starch: Add dilute Iodine solution on food. A blue-black colour confirms starch.
- Test for Protein: Add Copper Sulphate + Caustic Soda (NaOH). A violet colour indicates protein.
- Test for Fats: Rub the food on a white paper. An oily translucent patch under light confirms fats.
📌 Important Scientific Definitions
Nutrient: A component of food needed by our body to live, grow, and repair tissues.
Roughage: Indigestible dietary fibre that adds bulk to food and prevents constipation.
Balanced Diet: A diet containing adequate amounts of all essential nutrients, roughage, and water.
Deficiency Disease: A disease caused by the prolonged lack of an essential nutrient.
⚡ Chapter Test
Multiple Choice Questions
Q1. Which nutrient is primarily responsible for tissue growth and repair of wear-and-tear?
Q2. When dilute iodine solution is dropped on a raw potato slice, what colour appears?
CH-02 • Chemistry
Sorting Materials into Groups
📖 Revision Notes
Key Concepts & Summaries
Learn how scientists classify objects based on physical properties such as lustre, hardness, solubility, density in water, and optical transparency.
1. Physical Properties for Classification
- Lustre: Metals like Gold, Silver, Copper, and Iron have shiny, lustrous surfaces.
- Hardness: Soft materials scratch easily (sponge, chalk); hard materials resist compression (iron, diamond).
- Solubility: Substances that dissolve completely in water are soluble (salt, sugar); those that don't are insoluble (sand).
2. Optical Transparency Categories
- Transparent: Allows light to pass through unobstructed (Clear glass, clean water, air).
- Translucent: Allows light to pass through partially, scattering rays so objects are hazy (Butter paper, frosted glass).
- Opaque: Blocks all light, creating a shadow behind it (Wood, cardboard, metals).
⚡ Chapter Test
Multiple Choice Questions
Q1. Which of the following materials is lustrous?
CH-03 • Chemistry
Separation of Substances
📖 Revision Notes
Methods of Separation
Master methods of separating mixtures: Handpicking, Threshing, Winnowing, Sieving, Sedimentation, Decantation, Filtration, Evaporation, and Condensation.
1. Dry Separation Techniques
- Threshing: Beating dried stalks against a hard surface to free grain seeds.
- Winnowing: Blowing wind separates heavier grain seeds from lighter husk.
- Sieving: Passing mixture through mesh to separate different sized particles.
2. Insoluble Solids in Liquids
- Sedimentation: Allowing heavier insoluble particles to settle at the bottom.
- Decantation: Tilting the vessel to gently pour out top liquid without disturbing sediment.
- Filtration: Passing liquid through filter paper where residue stays behind, leaving clean filtrate.
CH-04 • Biology
Getting to Know Plants
📖 Revision Notes
Plant Anatomy & Reproduction
Classify plants into herbs, shrubs, and trees. Learn root systems (tap vs fibrous), stems, leaf venation, transpiration, and flower anatomy.
1. Leaf Venation & Root Correlation
- Reticulate Venation (Net-like veins, e.g., Mango, Rose) -> ALWAYS paired with a Tap Root!
- Parallel Venation (Straight parallel veins, e.g., Grass, Wheat) -> ALWAYS paired with Fibrous Roots!
💡 Botanical Rule: Never pull out plants to check roots — just check the leaf venation pattern!
2. Parts of a Flower
- Sepals: Green outer leaves protecting flower in bud.
- Petals: Bright fragrant petals that attract insects for pollination.
- Stamen (Male): Made of Filament and pollen-carrying Anther.
- Pistil (Female): Made of Stigma, Style, and basal Ovary with ovules.
CH-05 • Physics
Light, Shadows and Reflections
📖 Revision Notes
Optics Principles
Uncover rectilinear propagation of light, transparent vs opaque objects, shadow formation, pinhole camera inversion, and mirror reflections.
1. Rectilinear Propagation of Light
- Light travels strictly along straight lines.
- Shadow Formation requires 3 things: A light source, an opaque obstacle, and a screen.
- Shadows are always dark/black regardless of the colour of the object.
2. The Pinhole Camera
Light rays crossing through a tiny aperture produce an inverted, real, and coloured image on the screen.
CH-06 • Physics
Electricity and Circuits
📖 Revision Notes
Electric Cells & Complete Circuits
Learn the workings of an electric cell, incandescent filament, closed vs open circuits, electrical switches, and conductors vs insulators.
1. The Electric Cell
- Positive terminal (+): Raised metal cap on top.
- Negative terminal (-): Flat metal zinc disc at bottom.
- Current flows from positive (+) terminal to negative (-) terminal through the circuit.
2. Conductors vs Insulators
- Conductors: Allow electric charges to flow (Copper, Aluminium, Iron, Graphite pencil lead, Human body).
- Insulators: Block electric charges (Rubber, Plastic, Glass, Dry wood).
CH-07 • Physics
Fun with Magnets
📖 Revision Notes
Poles, Compass & Magnetic Laws
Discover natural magnetite lodestone, magnetic vs non-magnetic materials, North and South poles, compass navigation, and magnetic care.
1. Magnetic Poles & Laws of Attraction/Repulsion
- Every magnet has two poles: North Pole (N) and South Pole (S).
- Like poles REPEL each other: North repels North (N-N), South repels South (S-S).
- Unlike poles ATTRACT each other: North attracts South (N-S).
- Repulsion is the surest test of magnetism.