Question

Q1/ Select the correct statement(s) regarding acoustic, electrical, and electromagnetic (EM) signals.
a. electrical signals depend upon the vibration of air molecules, while EM waves depend upon the vibration of air molecules
b. acoustic signals can travel through the vacuum of space, while EM signal can only travel within the atmosphere
c. electrical signals (i.e., the flow electrons) and an electromagnetic wave both travel at the speed of light
d. all statements ate correct

Q2/ A switched circuit is one in which a user maintains the physical path through a network during the period of a call. Once the user’s call is complete, the communications path is made available to other users.
True/False

Q3/ Multiple user circuits can be combined as an aggregate trunk using a device called a multiplexer.
True/False

Answer 1

If you have any doubt ask in the comment section below.

Q1 ) C. electrical signals and an electromagnetic wave both travel at the speed of light.

Q2) False

Q3 ) True