Free PDF download of Important Questions with solutions for CBSE Class 9 Science Chapter 12 - Sound prepared by expert Science teachers from latest edition of CBSE(NCERT) books.  CoolGyan is a platform that provides free CBSE Solutions (NCERT) and other study materials for students. Maths Students who are looking for the better solutions ,they can download Class 9 Maths NCERT Solutions to help you to revise complete syllabus and score more marks in your examinations.