Match the following based on the part that vibrates to produce a sound from the objects in column 1: 

a.	i. Vocal cords
b.	ii. Air column
c.	iii. String

The correct answer is: a-ii, b-iii, c-i

According to the sound and friction made, the correct matching order would be a-ii, b-iii, c-i

• The schools have bells that produce sound by hitting that cause more vibration and friction.
• The mixer grinders of house produce a sound with maximum friction.
• The gyms have home theatre speakers that can produce a sound that can be increased to the maximum.