Chapter 18 Flashcards
The area covered by each microwave relay antenna mounted on towers is called a
Cell
A code is
The meaning of a single
When you talk on the telephone, the sound waves of your voice are converted to an electrical signal by a
Transducer
Television converts electromagnetic waves into
Image and sound
Which of the following is not a function of a computer?
Thinking
Optical fibers
Carry signals that are pulses of light and are smaller and lighter than wire cables
Computers process binary data in groups of
Eight bits
A computer keyboard is an example of a
Input device
When a computer is first turned on, the first program executed by the computer is the
Operating system
A digital signal is
All of these
A computer monitor is an example of a
Output device
Morse code was developed for
Sending information by telegraph
The binary number system is associated with
Digital signals
By the year 2009, all television signals will be broadcast
Digitally
Which of the following is not a computer input device?
A printer
A cordless phone is a
Transceiver
What is a satellite footprint?
The geographic region covered by a communication satellite
In a computer the operating system is stored on
The hard drive
In 1989, the web was
Used mostly as a resource for scientific information
Microwaves are a form of
Electromagnetic waves
One disadvantage of analog signals is that they
Get distorted after several transmissions
A cathode-ray tube in a black and white tv makes a beam of electrons from
A negatively charged cathode
To send sound using electricity the first step is to
Convert the sound into electric current
Language is a example of a
Code
Telephone messages are sent by
Both physical and atomospheric transmissions
Which of the following is NOT a means of telecommunication?
Postal delivery
Microwaves are used for sending telecommunication signals in
Atmospheric transmission
A signal is a sign that represents
Information
The antenna of your radio receiver works as a
Transducer
Each binary digit is called a
But
The smallest piece of an electronically produced picture is called a
Pixel
During a telephone call, the incoming electrical signals are converted to sound waves by
Speaker cone
Random-access memory,RAM, is contained on
Microchips
A computer modem is
Both an input and output device
The transfer of information by means of electromagnetic waves through space is called
Atmospheric transmission
All the physical components od a computer are called
Hardware
An analog signal
Varies continuously within a range
For radio broadcast,sound signal are converted to
Electromagnetic waves
All input devices provide data to the computer in the form of a
Binary code
Over the telephone line the sound waves from your voice are transmitted
As variations in electric current
