CBSE Class 9 Science Revision Notes, Chapter 12 Sound, PDF Download Free.
- 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