Bihar Board Class 10 · Science
Science: which chapter carries how many marks
How many marks and questions each chapter carried a year in Bihar Board (BSEB)’s 21 real papers of 2021–2026 — counted, not guessed. Start where the marks are.
| # | Chapter | Marks/yr | Qs/yr |
|---|---|---|---|
| 1 | 6. Life Processes | 12.4 | 17.0 |
| 2 | 10. Light – Reflection and Refraction | 7.9 | 11.5 |
| 3 | 12. Electricity | 6.9 | 9.5 |
| 4 | 2. Acids, Bases and Salts | 6.6 | 9.3 |
| 5 | 3. Metals and Non-metals | 5.7 | 8.3 |
| 6 | 4. Carbon and its Compounds | 5.5 | 7.3 |
| 7 | 11. The Human Eye and the Colourful World | 4.9 | 5.9 |
| 8 | 8. How do Organisms Reproduce? | 4.8 | 6.2 |
| 9 | 15. Our Environment | 4.3 | 5.3 |
| 10 | 14. Sources of Energy | 4.3 | 5.1 |
| 11 | 1. Chemical Reactions and Equations | 3.7 | 5.0 |
| 12 | 7. Control and Coordination | 3.7 | 5.4 |
| 13 | 13. Magnetic Effects of Electric Current | 3.5 | 4.0 |
| 14 | 5. Periodic Classification of Elements | 2.4 | 4.2 |
| 15 | 16. Management of Natural Resources | 1.7 | 1.5 |
| 16 | 9. Heredity and Evolution | 1.6 | 2.7 |
Average = total marks of the chapter’s questions over those years ÷ the years (one of a choice counted).
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