Unit #7 Comm Sys Multiple Choice

Which of the following devices is most likely to use a laser?

• computer speaker

• DVD player

• microwave oven

• space heater

The illustration below shows a person operating a light signal.

Light signals were once commonly used by ships for communication. By rapidly opening and closing the horizontal shutters in front of the light source, a person could send a coded message. This form of communication uses discrete signals.

Which of the following modern technologies also uses discrete signals?

• fiber optics

• film cameras

• record players

• sound speakers

The diagram below represents a section of fiber optic cable used in a communication network.

Which of the following allows fiber optic cables to transmit data?

• total bending of light

• total dispersion of light

• total internal reflection

• total internal refraction

A certain technology transmits information between nearby devices, such as cell phones, digital cameras, and headsets. Which of the following are mainly used by this technology to transmit information?

• ethernet cables

• gamma rays

• optical fibers

• radio waves

Which of the following statements best explains why fiber optic cable is preferred over copper wire in telephone and Internet applications?

• Fiberoptic cable can be used both indoors and outdoors.

• Fiber optic cable is more flexible and needs no power source.

• Fiber optic cable is easier to manufacture and install into office buildings.

• Fiber optic cable is less sensitive to temperature and electromagnetic interference.

Wireless signals can be used in long-distance data communication systems. Which two components of these communication systems interact with the wireless signals that travel a long distance?

• source and encoder

• receiver and decoder

• destination and storage

• transmitter and receiver

Many communication systems use fiber optic technology instead of copper wire. Which of the following statements describes an advantage of using fiber optics instead of copper wire for communications applications?

• Fiber optics have a lower initial cost.

• Fiber optics have a higher power rating.

• Fiber optics do not require expensive electric conductors to complete a communication system.

• Fiber optics provide greater bandwidth and can transmit more information along a similar-sized cable.

Encryption is an example of which of the following processes in a computer networking system?

• encoding

• receiving

• storing

• transmitting

Which of the following uses binary values?

• analog signals

• digital signals

• gamma rays

• ultraviolet rays

Under which of the following conditions would fiber optics most likely be preferred over radio waves for communication?

• The climate of the area is hot and humid.

• There are frequent power outages in the area.

• The content of the communication needs to be secure.

• There is little money available to build the communication system.