Transmission Media
1. Transmission media are usually categorized as _______.
A.  fixed or unfixed B.  guided or unguided C.  determinate or indeterminate D.  metallic or nonmetallic
2. Transmission media lie below the _______ layer.
A.  physical B.  network C.  transport D.  application
3. ______ cable consists of an inner copper core and a second conducting outer sheath.
A.  Twisted-pair B.  Coaxial C.  Fiber-optic D.  Shielded twisted-pair
4. In fiber optics, the signal is _______ waves.
A.  light B.  radio C.  infrared D.  very low-frequency
5. Which of the following primarily uses guided media?
A.  cellular telephone system B.  local telephone system C.  satellite communications D.  radio broadcasting
6. Which of the following is not a guided medium?
A.  twisted-pair cable B.  coaxial cable C.  fiber-optic cable D.  atmosphere
7. What is the major factor that makes coaxial cable less susceptible to noise than twisted-pair cable?
A.  inner conductor B.  diameter of cable C.  outer conductor D.  insulating material
8. In an optical fiber, the inner core is _______ the cladding.
A.  denser than B.  less dense than C.  the same density as D.  another name for
9. The inner core of an optical fiber is _______ in composition.
A.  glass or plastic B.  copper C.  bimetallic D.  liquid
10. . When a beam of light travels through media of two different densities, if the angle of incidence is greater than the critical angle, _______ occurs.
A.  reflection B.  refraction C.  incidence D.  criticism