CBSE Class 9 Answered

the three major classes are 1)Stringed, 2)wind and 3)percussion instruments

1)they have a set of different types of strings tuned accordingally. At one end they are fixed at a bridge and then at the other end they are they are fixed by the keys. Sound by them is produced by plucking the strings which produces vibration.

2)a vibrating air coloumn produce a musical sound.

3)a vibrating skin or membrane produce a mucical sound in case of percussion instruments, when they are sturk then they produce this sound by moving up and down, and thus producing a vibration.