WhatsApp Updates
📚 CBSE BOARD 2025–26

Class 10 Science – Important Questions,
PYQs & NCERT Solutions

Chapter-wise PDF downloads, previous year question papers with answers, key facts to remember, and answer writing practice — all free!

✅ Important Questions 📄 Previous Year Papers 📖 NCERT Solutions 💡 Key Facts ✍️ Answer Writing Practice
Home › Study Material › Class 10 Science
⚠️ How to use: Click any chapter below → Download PDFs → Practice answer writing → Learn key facts. New chapters added regularly!

🧪 Chemistry Chapters

Class 10 NCERT Science – Chemistry | Important Questions, PYQs & Solutions PDF

Updated
1

Chemical Reactions and Equations

Balancing equations, types of reactions, oxidation-reduction

▼

⭐ Key Facts to Remember

  • A chemical equation is balanced using the law of conservation of mass.
  • Types: Combination, Decomposition, Displacement, Double Displacement, Redox reactions.
  • Corrosion = slow oxidation of metals (iron rusting, silver tarnishing).
  • Rancidity = oxidation of fat/oil causing bad smell; prevented by antioxidants or inert gas.
  • OIL RIG: Oxidation Is Loss, Reduction Is Gain (of electrons).

📄 Download PDFs – Chapter 1

PDF
⚗️
Radicals & Their Valency
Important Q&A • Ch 1
⬇ Download PDF
PDF
🔥
Types of Reactions – Revision
Important Q&A • Ch 1
⬇ Download PDF
PDF
💧
Water of Crystallization
Important Q&A • Ch 1
⬇ Download PDF
PDF
🌈
Colour Change in Reactions
Important Q&A • Ch 1
⬇ Download PDF
🌐 CBSE Board-Style Questions with Detailed Explanations — 1 Mark, 2 Marks, 3 Marks & 4 Marks 📖 Start Answer Practice
Updated
2

Acids, Bases and Salts

pH scale, properties, everyday compounds like baking soda, bleaching powder

▼

⭐ Key Facts to Remember

  • pH < 7 = Acidic, pH = 7 = Neutral, pH > 7 = Basic/Alkaline.
  • Acid + Base → Salt + Water (Neutralisation reaction).
  • Baking Soda = NaHCO₃ | Washing Soda = Na₂CO₃·10H₂O | Bleaching Powder = Ca(OCl)Cl.
  • Plaster of Paris = CaSO₄·½H₂O (sets hard on adding water).
  • Indicators: Litmus, Phenolphthalein, Methyl Orange used to test acid/base.
✍️ CBSE Board-Style Questions with Detailed Explanations — 1 Mark, 2 Marks, 3 Marks & 4 Marks Start Answer Practice

📄 PDFs – Coming Soon

🚀 PDFs for Chapter 2 will be uploaded soon!
Follow us on WhatsApp for updates.
Updated
3

Metals and Non-metals

Reactivity series, metal extraction, corrosion, alloys

▼

⭐ Key Facts to Remember

  • Most reactive metal: Potassium (K). Least: Gold (Au). Reactivity series: K > Na > Ca > Mg > Al > Zn > Fe > Pb > H > Cu > Ag > Au.
  • Thermite reaction: Fe₂O₃ + 2Al → Al₂O₃ + 2Fe + Heat (used in welding).
  • Alloys: Brass (Cu+Zn), Bronze (Cu+Sn), Solder (Pb+Sn).
  • Galvanisation = coating iron with zinc to prevent rust.
  • Non-metals like Carbon (graphite) can conduct electricity.

📄 PDFs – Coming Soon

🚀 PDFs for Chapter 3 uploading soon!
✍️ CBSE Board-Style Questions with Detailed Explanations — 1 Mark, 2 Marks, 3 Marks & 4 Marks 📖 Start Answer Practice
Updated
4

Carbon and Its Compounds

Covalent bonding, hydrocarbons, ethanol, ethanoic acid, soaps & detergents

▼

⭐ Key Facts to Remember

  • Carbon shows covalency = 4. It forms long chains due to catenation.
  • Saturated hydrocarbons (alkanes: CₙH₂ₙ₊₂) — single bonds only.
  • Unsaturated: Alkenes (double bond), Alkynes (triple bond).
  • Ethanol (C₂H₅OH) = common alcohol; denatured with methanol to prevent drinking.
  • Saponification = making soap from fat + NaOH (alkali).
  • Soaps work in soft water; detergents work in both hard and soft water.

📄 PDFs – Coming Soon

🚀 PDFs for Chapter 4 uploading soon!
✍️ CBSE Board-Style Questions with Detailed Explanations — 1 Mark, 2 Marks, 3 Marks & 4 Marks 📖 Start Answer Practice

🌿 Biology Chapters

Class 10 NCERT Science – Biology | Important Questions, PYQs & Solutions PDF

5

Life Processes

Nutrition, respiration, transportation, excretion in plants and animals

▼

⭐ Key Facts to Remember

  • Photosynthesis: 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂ (in presence of sunlight & chlorophyll).
  • Aerobic respiration releases 38 ATP; Anaerobic releases only 2 ATP per glucose.
  • Human heart has 4 chambers; pumps ~72 times/minute at rest.
  • Kidney filters blood; functional unit = Nephron. Dialysis replaces kidney function.
  • Plants excrete: CO₂ (respiration), O₂ (photosynthesis), excess water (transpiration).
✍️ Diagram-based questions are common here. Practice labelled diagrams! Start Answer Practice

📄 PDFs – Coming Soon

🚀 PDFs for Chapter 5 uploading soon! Stay tuned.
🌐 Online NCERT Solutions for Chapter 5 – coming soon! 📖 View Online
6

Control and Coordination

Nervous system, hormones, reflex action, plant movements

▼

⭐ Key Facts to Remember

  • Neuron = structural and functional unit of nervous system.
  • Reflex arc: Receptor → Sensory nerve → Spinal cord → Motor nerve → Effector.
  • Human brain: Cerebrum (thinking), Cerebellum (balance), Medulla (involuntary actions).
  • Endocrine glands: Pituitary (master gland), Thyroid (thyroxin), Pancreas (insulin).
  • Phototropism = plant bends toward light; Geotropism = roots grow toward gravity.

📄 PDFs – Coming Soon

🚀 PDFs for Chapter 6 uploading soon!
🌐 Online NCERT Solutions for Chapter 6 – coming soon! 📖 View Online
7

How Do Organisms Reproduce?

Asexual & sexual reproduction, human reproductive system, contraception

▼

⭐ Key Facts to Remember

  • Asexual reproduction: Fission (Amoeba), Budding (Hydra, Yeast), Spore formation (Bread mould).
  • Vegetative propagation = new plant from part of plant (e.g. potato, rose, Bryophyllum).
  • Pollination: Self-pollination (same flower), Cross-pollination (different flowers).
  • Fertilization in humans: Sperm + Egg → Zygote → Embryo → Foetus.
  • DNA copying is essential in reproduction to maintain species characteristics.

📄 PDFs – Coming Soon

🚀 PDFs for Chapter 7 uploading soon!
🌐 Online NCERT Solutions for Chapter 7 – coming soon! 📖 View Online
8

Heredity and Evolution

Mendel's laws, genetics, inherited traits, Darwin's theory

▼

⭐ Key Facts to Remember

  • Gregor Mendel = "Father of Genetics"; experimented on pea plants.
  • Law of Segregation: In F2, ratio is 3 Dominant : 1 Recessive.
  • Sex determination: XX = Female, XY = Male. Father determines child's sex.
  • Evolution = gradual change in species over many generations.
  • Homologous organs: same structure, different function (e.g. human hand & whale flipper).

📄 PDFs – Coming Soon

🚀 PDFs for Chapter 8 uploading soon!
🌐 Online NCERT Solutions for Chapter 8 – coming soon! 📖 View Online

⚡ Physics Chapters

Class 10 NCERT Science – Physics | Important Questions, PYQs & Solutions PDF

9

Light – Reflection and Refraction

Laws of reflection/refraction, mirrors, lenses, image formation

▼

⭐ Key Facts to Remember

  • Mirror formula: 1/f = 1/v + 1/u. Magnification m = -v/u.
  • Concave mirror: used in torches, car headlights, shaving mirrors.
  • Convex mirror: used as rear-view mirror (wider field of view, always virtual image).
  • Snell's Law: n₁ sin θ₁ = n₂ sin θ₂ (law of refraction).
  • Lens formula: 1/f = 1/v - 1/u. Power P = 1/f (in metres); unit = Dioptre (D).

📄 PDFs – Coming Soon

🚀 PDFs for Chapter 9 uploading soon!
🌐 Online NCERT Solutions for Chapter 9 – coming soon! 📖 View Online
10

The Human Eye and the Colourful World

Vision defects, rainbow, atmospheric refraction, scattering of light

▼

⭐ Key Facts to Remember

  • Myopia (short-sight): distant objects blurry → corrected by concave lens.
  • Hypermetropia (long-sight): near objects blurry → corrected by convex lens.
  • Power of accommodation = eye's ability to adjust focal length.
  • Sky is blue due to scattering of light (Rayleigh scattering – shorter wavelengths scatter more).
  • Sunset appears red because blue light is scattered away; red has longest wavelength.

📄 PDFs – Coming Soon

🚀 PDFs for Chapter 10 uploading soon!
🌐 Online NCERT Solutions for Chapter 10 – coming soon! 📖 View Online
11

Electricity

Current, voltage, Ohm's law, resistance, power, series & parallel circuits

▼

⭐ Key Facts to Remember

  • Ohm's Law: V = IR (Voltage = Current × Resistance).
  • Series: R_total = R₁ + R₂ + R₃ | Same current through all.
  • Parallel: 1/R_total = 1/R₁ + 1/R₂ | Same voltage across all.
  • Power P = VI = I²R = V²/R. Unit = Watt (W).
  • 1 kWh = 1 Unit of electricity = 3.6 × 10⁶ J.

📄 PDFs – Coming Soon

🚀 PDFs for Chapter 11 uploading soon!
🌐 Online NCERT Solutions for Chapter 11 – coming soon! 📖 View Online
12

Magnetic Effects of Electric Current

Magnetic fields, motors, generators, Fleming's rules

▼

⭐ Key Facts to Remember

  • Right-hand thumb rule: Thumb → direction of current; fingers → direction of magnetic field.
  • Fleming's Left-Hand Rule: Motor effect (F, B, I direction).
  • Fleming's Right-Hand Rule: Generator/induced current direction.
  • Electric motor: converts electrical energy → mechanical energy.
  • Generator (dynamo): converts mechanical energy → electrical energy.
  • AC changes direction 50 times/second (frequency = 50 Hz in India).

📄 PDFs – Coming Soon

🚀 PDFs for Chapter 12 uploading soon!
🌐 Online NCERT Solutions for Chapter 12 – coming soon! 📖 View Online

🌍 Environment Chapter

Class 10 NCERT Science – Environment | Important Questions, PYQs & Solutions PDF

13

Our Environment

Food chains, ecosystems, biodegradable waste, ozone layer, human impact

▼

⭐ Key Facts to Remember

  • Ecosystem = all living organisms + non-living things in an area interacting together.
  • Producers → Primary Consumers → Secondary → Tertiary (food chain).
  • Only 10% of energy is transferred to the next trophic level (10% law by Lindemann).
  • Biodegradable: paper, food, cotton. Non-biodegradable: plastic, DDT, glass.
  • Ozone layer (O₃) absorbs harmful UV rays. CFCs deplete the ozone layer.
  • Biological magnification: concentration of harmful chemicals increases at higher trophic levels.
✍️ Practice 5-mark answers on food chains and ozone depletion! Start Answer Practice

📄 PDFs – Coming Soon

🚀 PDFs for Chapter 13 uploading soon!
🌐 Online NCERT Solutions for Chapter 13 – coming soon! 📖 View Online
🎯 Practice MCQ Questions for Academics & Competitions Sharpen your speed and accuracy with timed MCQs — perfect for boards, NTSE & Olympiad preparation!
Start MCQ Practice →

📋 How to Use This Page

1

Choose Your Chapter

Click a subject tab and expand the chapter you want to study.

2

Read Key Facts

Memorize the golden facts — these appear most often in board exams.

3

Download PDFs

Get important questions with solutions and previous year papers.

4

Practice Answer Writing

Weak students: use the answer practice section to write structured answers.