CBSE Class 10 Science — chapter-wise important questions and model answers

The board’s question papers

• Question Paper 2026
• Question Paper 2025
• Sample Paper 2025
• Question Paper 2024
• Sample Paper 2024
• Question Paper 2023
• Sample Paper 2023

Chapter-wise notes

• 8. Heredity

Chapters

1. 1. Chemical Reactions and Equationsabout 6 marks a year37 questions
2. 2. Acids, Bases and Saltsabout 7 marks a year36 questions
3. 3. Metals and Non-metalsabout 6 marks a year41 questions
4. 4. Carbon and its Compoundsabout 6 marks a year35 questions
5. 5. Life Processesabout 8 marks a year55 questions
6. 6. Control and Coordinationabout 5 marks a year38 questions
7. 7. How do Organisms Reproduce?about 7 marks a year38 questions
8. 8. Heredityabout 5 marks a year30 questions
9. 9. Light – Reflection and Refractionabout 7 marks a year57 questions
10. 10. The Human Eye and the Colourful Worldabout 5 marks a year35 questions
11. 11. Electricityabout 8 marks a year60 questions
12. 12. Magnetic Effects of Electric Currentabout 5 marks a year35 questions
13. 13. Our Environmentabout 5 marks a year33 questions

Questions parents and students ask

Which chapters carry the most marks in CBSE Class 10 Science?

By the past papers: Life Processes (about 8 marks a year), Electricity (about 8 marks a year), Light – Reflection and Refraction (about 7 marks a year), How do Organisms Reproduce? (about 7 marks a year), Acids, Bases and Salts (about 7 marks a year).

How to prepare Science for the CBSE exam 2027?

Start with the chapters that carry the most marks; work the board’s real questions of each chapter and compare with the model answer; do objective questions daily; write one full paper to time every week. The Ask Medha app does exactly this in 45 minutes a day, at your pace.