SOUND – MCQ
A sound is a form of energy, just like electricity, heat or light. It is one of the important senses of the human body. Some sounds are pleasant, and some are annoying. There are three categories of sound waves based on their frequencies. They are Audible waves, Infrasonic waves and Ultrasonic waves. Mechanical waves are two types. Sound is used for various application.
2.3. CET-SC-SOUND