Only vibrating bodies produce sound. State true or false.
A. True
B. False

Hint: A sound is a form of energy that propagates in the form of vibrations through the medium such as solid, liquid, and gas. It is a mechanical wave because it requires a medium to propagate.

Complete step by step answer:
As discussed sound is a type of mechanical wave hence it needs a medium to propagate. Therefore a question arises that how the sound is produced and how it propagates? The answer to this question is sound is produced when a body continuously to and fro from its equilibrium position. When this occurs the particles in contact with those objects also start vibrating as the energy is transferred to them by the object.

Similarly, the energy is transferred to the other particles and in this way, sound propagates in any medium. Vibration is needed for the production of sound and this vibration can be obtained by various methods. For example, when the two bodies strike each other they start vibrating and produce sound.

An important property needed for the production of sound is that the frequency of the vibration should be the same. Hence vibration plays a vital role in the production of sound.

Hence, the correct answer is option (A).

Note: A human being and animal can hear the sound because of the vibration only. When an object starts vibrating then the air molecules near to it also start vibrating to and fro and similarly the transfer of the vibration continues until it reaches our ears. This vibration then reaches our ears and the drum in turns starts vibrating and hence sound can be heard.