Data Communications - Physical Layer
(185).jpg "Data Communications - Physical Layer - Quiz")
This quiz is all about Physical Layer.
- 1.The type of coaxial cable which uses a dielectric material to separate conductors is called __________________.
- 2.The type of coaxial cable which uses a solid dielectric material to separate conductors is called _______________.
- 3.Signals propagating down an unguided transmission medium are available to anyone who has a device capable of receiving them. TRUE or FALSE?
- 4.The band of frequencies that are too low to be seen by the human eye.
- 5.Physical layer is the lowest layer of the OSI protocol hierarchy which also means the ______________________ .
- A.
Computer
- B.
Modem
- C.
Transmission medium
- D.
Conductors
- 6.The displacement of ____________ waves is in the direction of propagation.
- A.
Transverse
- B.
Longitudinal
- C.
Electromagnetic
- D.
Sound waves
- 7.The displacement of ____________ waves is perpendicular to the direction of propagation
- A.
Transverse
- B.
Longitudinal
- C.
Sound waves
- D.
Surface wave of water
- 8.A transverse wave is an ____________ motion.
- A.
Irregular interval
- B.
Interrupted rhythm.
- C.
Oscillatory
- D.
See-saw
- 9.Electromagnetic waves are produced by the acceleration of _________________.
- A.
An electric charge
- B.
A magnetic field
- C.
Irregular interval motion
- D.
Oscillatory motion
- 10.Electromagnetic waves that travel along a transmission line from the source to the load are _____________ .
- A.
Reflected waves
- B.
Space quadrature
- C.
Longitudinal waves
- D.
Incident waves
- 11.Electromagnetic waves that travel from the load back toward the source are called _________________.
- A.
Reflected waves.
- B.
Space quadrature
- C.
Longitudinal waves
- D.
Incident waves
- 12.The distance of one cycle occurring in space is ____________.
- A.
Wave velocity
- B.
Frequency
- C.
Wavelength
- D.
Period
- 13.___________________ is periodic and repetitive oscillations of electromagnetic wave
- A.
Wave velocity
- B.
Frequency
- C.
Wavelength
- D.
Period
- 14.It is defined as waves travel at various speed, depending on the type of wave and the characteristics of the propagation medium
- A.
Wave velocity
- B.
Frequency
- C.
Wavelength
- D.
Period
- 15.It comprised of two or more metallic conductors separated by a nonconductive insulating material.
- A.
Open-wire
- B.
Twin-lead
- C.
Twisted pair
- D.
Coaxial cable
- 16.It comprised of two or more metallic conductors separated by the spacers with a continuous solid dielectric that ensures uniform spacing along the entire cable.
- A.
Open-wire
- B.
Twin-lead
- C.
Twisted pair
- D.
Coaxial cable
- 17.It is formed by twisting two insulated conductors around each other.
- A.
Open-wire
- B.
Twin-lead
- C.
Twisted pair
- D.
Coaxial cable
- 18.This cable consists of two copper wires where each wire is separately encapsulated in polyvinyl chloride insulation.
- A.
Shielded twisted-pair
- B.
Unshielded twisted-pair
- C.
Coaxial cable
- D.
Fiber optics
- 19.From the selection below, identify the disadvantage of using optical fiber technology.
- A.
Fiber optic transmitters and receivers are still relatively expensive compared to electrical interfaces.
- B.
Fiber optic networks operate at high speeds - up into the gigabits with large carrying capacity.
- C.
Fiber optic cables costs much less to maintain.
- D.
Fiber optics are immune to electromagnetic interference.
- 20.Which of the following is TRUE?
- A.
The information on the conductor are more secured than optical fiber.
- B.
Fiber optic cables sometimes produce sparks since they do have leakage current.
- C.
There are no radiated magnetic fields around optical fibers; the electromagnetic fields are confined within the fiber.
- D.
There is no loss of data when fiber optic cable is bent.
- 21.Thin glass center of the fiber where the light travels is ________________.
- A.
Core
- B.
Cladding
- C.
Jacket
- D.
Sheath
- 22.The outer optical material surrounding the thin glass center of the fiber that reflects the light back into this thin glass is __________________.
- A.
Core
- B.
Cladding
- C.
Jacket
- D.
Sheath
- 23.Plastic coating that protects the fiber from damage and moisture is ____________.
- A.
Core
- B.
Cladding
- C.
Jacket
- D.
Sheath
- 24.The bundles of 2 or more fiber cables are protected by the cable's outer covering, called ________________.
- A.
Core
- B.
Cladding
- C.
Jacket
- D.
Sheath
- 25.The transfer of information over a distance without the use of electrical conductors is through ___________________.
- A.
Computer
- B.
Coaxial cable
- C.
Fiber optics
- D.
Wireless transmission
Questions: 10 | Attempts: 6764 | Last updated: Mar 22, 2022
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