A specially constructed microphone attached directly to an object or surface to be protected, which responds only when the protected object or surface is disturbed, is known as:

A specially constructed microphone attached directly to an object or surface to be protected, which responds only when the protected object or surface is disturbed, is known as:
A . Parabolic microphone
B . Special audio microphone
C . Contact microphone
D . Surreptitious microphone
E . None of the above

View Answer

Answer: C