Data Communications - Physical Layer
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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
- 26.The _______________ of the telephone system can consist of digital fiber optics connecting the switching offices.
- A.
Trunks
- B.
Local loops
- C.
Switching offices
- D.
Gateway
- 27.____________________ of the telephone system are places where calls are moved from one trunk to another.
- A.
Trunks
- B.
Local loops
- C.
Switching offices
- D.
Gateway
- 28.In the ISO OSI network reference model, layers exist to encapsulate specific types of functionality so not to allow the divide and conquer approach to be applied to networking
- A.
The above statement is TRUE.
- B.
The above statement is FALSE.
- C.
The above statement is sometimes TRUE.
- D.
The above statement is simetimes FALSE.
- 29.The Data Link Layer is a fundamental layer upon which all higher level functions in a network are based.
- A.
The above statement is TRUE.
- B.
The above statement is FALSE.
- C.
The above statement is sometimes TRUE.
- D.
The above statement is sometimes FALSE.
- 30.Fiber optic technology makes use of electricity to carry digital signals via optical cables.
- A.
The above statement is TRUE.
- B.
The above statement is FALSE.
- C.
The above statement is sometimes TRUE.
- D.
The above statement is sometimes FALSE.
- 31.Category 5 UTP is intended to use in low-speed local area networks with data rate of 16 Mbps and below.
- A.
The above statement is TRUE.
- B.
The above statement is FALSE.
- C.
The above statement is sometimes TRUE.
- D.
The above statement is sometimes FALSE.
- 32.Category 3 UTP is intended to use in high-speed local area networks with data rate of 100Mbps.
- A.
The above statement is TRUE.
- B.
The above statement is FALSE.
- C.
The above statement is sometimes TRUE.
- D.
The above statement is sometimes FALSE.
- 33.The inner part of a coaxial cable is _______________.
- 34.Part of the OSI architecture that activates, maintains, and deactivates network connections.
- 35.Category of transmission media with some form of conductor that provides a conduit in which electromagnetic signals are contained
- 36.The direction of propagation in an unguided transmission medium depends on the direction in which the signal was emitted and any obstacles the signal may encounter while propagating. TRUE or FALSE?
- 37.Transmission media should be transparent to data with the sole purpose of transporting bits among computers, computer networks and other computer equipment. TRUE or FALSE?
- 38.Transmission medium is simply the path between a transmitter and a receiver in a communications system. TRUE or FALSE?
- 39.______________________ is a transmission line is a metallic conductor system used to transfer electrical energy from one point to another using electrical current flow.
- 40.Transmission lines can be used to propagate only dc or low-frequency ac signals. TRUE or FALSE?
- 41.An example of a transverse wave is surface wave of water. TRUE or FALSE?
- 42.The spatial relationship between the electric and magnetic field in the electromagnetic wave where the E and H are perpendicular to each other at all points is called _______________.
- A.
Incident waves
- B.
Reflected waves
- C.
Space quadrature
- D.
Vacuum
- 43.In the very low frequency bands, radio waves follow the atmospheric layers of the earth. TRUE or FALSE?
- 44.A satellite that appears stationary with respect to a fixed point on the rotating Earth.
- A.
Geostationary satellite
- B.
Medium-Earth Orbit Satellite
- C.
Low-Earth Orbit Satellite
- 45.A satellite designed to help facilitate high-speed telephone signals.
- A.
Geostationary satellite
- B.
Medium-Earth Orbit Satellite
- C.
Low-Earth Orbit Satellite
- 46.Satellites that orbit so close to Earth.
- A.
Geostationary satellite
- B.
Medium-Earth Orbit Satellite
- C.
Low-Earth Orbit Satellite
- 47.The band of frequencies that is too high to be seen by the human eye.
- 48.The band of frequencies to which the human eye will respond.
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