Certified Protection Professional (CPP) Practice Exam

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What is a contact microphone designed to do?

Record sound waves in the air
Respond to vibrations when an object is disturbed
Transmit signals over long distances
Block sound from reaching a speaker

The correct answer is: Respond to vibrations when an object is disturbed

A contact microphone is specifically designed to respond to vibrations when an object is disturbed. This type of microphone captures sounds directly from a solid surface by converting the mechanical vibrations of the surface into an electrical signal. This allows it to pick up sound not transmitted through the air, making it ideal for recording instruments or any sound emanating from solid objects. In contrast, recording sound waves in the air pertains to traditional microphones that capture audible sound through air pressure changes. Transmitting signals over long distances is a function associated with a variety of communication technologies, not specifically contact microphones. Blocking sound from reaching a speaker relates more to soundproofing or acoustic treatments rather than any microphone functionality. Thus, the primary function of a contact microphone is accurately reflected in the response to vibrations from disturbed objects.