- Chapter 1: Matter in Our Surroundings
- Chapter 2: Is Matter Around Us Pure
- Chapter 3: Atoms and Molecules
- Chapter 4: Structure of the Atom
- Chapter 5: The Fundamental Unit of Life
- Chapter 6: Tissues
- Chapter 7: Diversity in Living Organisms
- Chapter 8: Motion
- Chapter 9: Force and Laws of Motion
- Chapter 10: Gravitation
- Chapter 11: Work and Energy
- Chapter 12: Sound
- Chapter 13: Why Do We Fall Ill
- Chapter 14: Natural Resources
- Chapter 15: Improvement in Food Resources
Class 9 Science Notes. Chapter 12 Sound. PDF Download Free. Question Answers.