CBSE Board 2027 · Science
Class 10 Science important questions and PYQs, chapter by chapter
Pick a chapter. Each page has the 10 board questions to practise first, from every CBSE paper 2023–2026, with official answers, the marks that chapter carries, and a free test.
- Chapter 1 Chemical Reactions and Equations Chemical Substances – Nature and Behaviour unit: 6 of 80 marks Top question: Why the beaker becomes hot
- Chapter 2 Acids, Bases and Salts Chemical Substances – Nature and Behaviour unit: 7 of 80 marks Top question: Order five solutions by pH
- Chapter 3 Metals and Non-metals Chemical Substances – Nature and Behaviour unit: 6 of 80 marks Top question: Nature of Al and Zn oxides
- Chapter 4 Carbon and its Compounds Chemical Substances – Nature and Behaviour unit: 6 of 80 marks Top question: Benzene, C4+ ion, ethanol, ester
- Chapter 5 Life Processes World of Living unit: 8 of 80 marks Top question: No xylem; bleeding injury
- Chapter 6 Control and Coordination World of Living unit: 5 of 80 marks Top question: Impulse limits; plant movement
- Chapter 7 How do Organisms Reproduce? World of Living unit: 7 of 80 marks Top question: Why chromosome number is steady
- Chapter 8 Heredity World of Living unit: 4 of 80 marks Top question: Case: bread-wheat genome
- Chapter 9 Light – Reflection and Refraction Natural Phenomena unit: 7 of 80 marks Top question: Power of lens f = −10 cm, image
- Chapter 10 The Human Eye and the Colourful World Natural Phenomena unit: 5 of 80 marks Top question: What is a rainbow? Draw it
- Chapter 11 Electricity Effects of Current unit: 7 of 80 marks Top question: Ohm's law circuit; V-I graphs
- Chapter 12 Magnetic Effects of Electric Current Effects of Current unit: 6 of 80 marks Top question: Field of two opposite currents
- Chapter 13 Our Environment Natural Resources unit: 5 of 80 marks Top question: Harmful chemicals in food chain