Explore: All CBSE Class 10 chapters · CBSE Class 10 hub · Syllabus & pattern · Class 10 2026
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CBSE Class 10 Science PYQs (previous year questions), chapter wise: we tagged 327 Science questions from 40 official CBSE Class 10 papers (2016–2026). The chapters asked most are Light: Reflection and Refraction (36), How do Organisms Reproduce (35), Carbon and its Compounds (33). Open any chapter for every question it has had.
Science chapters ranked by questions
- Light: Reflection and Refraction PYQs: 36 questions; most asked: Spherical Lenses
- How do Organisms Reproduce PYQs: 35 questions; most asked: Human Reproduction
- Carbon and its Compounds PYQs: 33 questions; most asked: Hydrocarbons
- Life Processes PYQs: 25 questions; most asked: Respiration
- Heredity and Evolution PYQs: 24 questions; most asked: Mendel’s Experiments
- Metals and Non-metals PYQs: 21 questions; most asked: Extraction of Metals
- Acids, Bases and Salts PYQs: 20 questions; most asked: pH Scale
- The Human Eye and the Colourful World PYQs: 20 questions; most asked: Dispersion of Light
- Chemical Reactions and Equations PYQs: 19 questions; most asked: Decomposition Reactions
- Magnetic Effects of Electric Current PYQs: 19 questions; most asked: Force on Conductor
- Our Environment PYQs: 19 questions; most asked: Food Chains
- Electricity PYQs: 18 questions; most asked: Resistors in Combination
- Control and Coordination PYQs: 15 questions; most asked: Nervous System
- Periodic Classification of Elements PYQs: 10 questions; most asked: Modern Periodic Table
- Sustainable Management of Natural Resources PYQs: 9 questions; most asked: Fossil Fuels
- Sources of Energy PYQs: 4 questions; most asked: Nuclear Energy
Science questions by year
| Chapter | 2026 | 2025 | 2024 | 2023 | 2022 | 2020 | 2019 | 2018 | 2017 | 2016 | All questions |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Chemical Reactions and Equations | 3 | 3 | 4 | 3 | 0 | 3 | 1 | 2 | 0 | 0 | 19 |
| Acids, Bases and Salts | 3 | 3 | 3 | 5 | 0 | 3 | 2 | 1 | 0 | 0 | 20 |
| Metals and Non-metals | 4 | 6 | 4 | 3 | 0 | 1 | 1 | 2 | 0 | 0 | 21 |
| Carbon and its Compounds | 3 | 1 | 2 | 2 | 2 | 3 | 2 | 2 | 8 | 8 | 33 |
| Periodic Classification of Elements | 0 | 0 | 0 | 0 | 2 | 1 | 2 | 1 | 2 | 2 | 10 |
| Life Processes | 4 | 4 | 4 | 6 | 0 | 1 | 4 | 2 | 0 | 0 | 25 |
| Control and Coordination | 4 | 2 | 3 | 2 | 0 | 1 | 1 | 2 | 0 | 0 | 15 |
| How do Organisms Reproduce | 4 | 4 | 2 | 2 | 3 | 2 | 1 | 3 | 7 | 7 | 35 |
| Heredity and Evolution | 2 | 2 | 3 | 3 | 2 | 2 | 1 | 1 | 4 | 4 | 24 |
| Light: Reflection and Refraction | 4 | 4 | 3 | 2 | 0 | 2 | 2 | 3 | 8 | 8 | 36 |
| The Human Eye and the Colourful World | 3 | 1 | 3 | 2 | 0 | 2 | 3 | 1 | 3 | 2 | 20 |
| Electricity | 1 | 3 | 2 | 3 | 2 | 2 | 2 | 3 | 0 | 0 | 18 |
| Magnetic Effects of Electric Current | 2 | 2 | 3 | 4 | 2 | 3 | 2 | 1 | 0 | 0 | 19 |
| Sources of Energy | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 0 | 1 | 4 |
| Our Environment | 2 | 4 | 3 | 2 | 2 | 1 | 1 | 1 | 1 | 2 | 19 |
| Sustainable Management of Natural Resources | 0 | 0 | 0 | 0 | 0 | 2 | 1 | 1 | 3 | 2 | 9 |
Most-asked Science concepts
| Concept | Chapter | Questions | Papers |
|---|---|---|---|
| Mendel’s Experiments | Heredity and Evolution | 8 | 8 |
| Spherical Lenses | Light: Reflection and Refraction | 14 | 7 |
| Spherical Mirrors | Light: Reflection and Refraction | 11 | 6 |
| Respiration | Life Processes | 9 | 6 |
| Decomposition Reactions | Chemical Reactions and Equations | 7 | 6 |
| Resistors in Combination | Electricity | 7 | 6 |
| Dispersion of Light | The Human Eye and the Colourful World | 6 | 6 |
| Food Chains | Our Environment | 6 | 5 |
| Human Reproduction | How do Organisms Reproduce | 5 | 5 |
| Defects of Vision | The Human Eye and the Colourful World | 5 | 5 |
| Circulation | Life Processes | 5 | 4 |
| Extraction of Metals | Metals and Non-metals | 5 | 4 |
| Sexual Reproduction in Plants | How do Organisms Reproduce | 4 | 4 |
| Stomata | Life Processes | 4 | 4 |
| Nutrition in Humans | Life Processes | 4 | 4 |
How to use CBSE Class 10 Science PYQs
- Start with the chapters at the top of the ranking. They carry the most questions.
- For each chapter, solve its PYQs year by year from the official PDFs, then check the answers.
- Log misses by concept. When a concept repeats in your log, go back to that chapter’s concept table.
- Finish with full CBSE Class 10 papers from the year pages to practise timing.
Other CBSE Class 10 subjects
- CBSE Class 10 Mathematics PYQs
- CBSE Class 10 Social Science PYQs
- CBSE Class 10 English Language and Literature PYQs
FAQ
Which Science chapters are most important for CBSE Class 10?
By questions in the official papers we tagged (2016–2026): Light: Reflection and Refraction (36), How do Organisms Reproduce (35), Carbon and its Compounds (33). The table on this page ranks every Science chapter.
How many Science questions are in these CBSE Class 10 PYQs?
327 Science questions across 40 official CBSE Class 10 papers from 2016–2026, spread over 16 chapters.
Are these CBSE Class 10 Science PYQs official?
Yes. Every question is from an official CBSE Class 10 paper hosted on our year pages. Summaries are ours; the full question is in the official PDF linked beside it.