Communication is a word which means to be in touch in a normal language but in technologies means receiving and sending information.
Data Communication is the exchange between two devices using some form of transmission media. Data is transferred from one place to another in the form of signals. It includes the transfer of data or information and the method of preservation of data during the transfer process. This transmission of data is done between a centralizes computer and remote terminals or between two or more computer centres over established communication.
There are three types of signals
(i) Digital Signal
(ii) Analog Signal
(iii) Hybrid Signal
Transmission of Data can be done many ways but mainly are of three types
(i) Simplex Channel
(ii) Half Duplex Channel
(iii) Full Duplex Channel
SOME QUESTION WHICH IS ASKED FREQUENTLY
1. What types of memory is lost when your PC is switch off?
(d) Dynamic
(e) Static
2. Name the program that controls the computer.
(a) The operating system
(b) An Application Program
(c) A browser
(d) The file Manager
3. Which type of network would use phone lines?
(e) All of these
4. Name the command used to remove text or graphics from a document, the information is then stored on a clipboard so you can paste it.
(d) Cart away
(e) None of these
5. Shortcut to create new directory, is
(a) Ctrl + F
(b) Right click button (keyboard) + W + Enter
(c) Right click button (keyboard) + F + Enter
(d) Right click button (keyboard) + N + Enter
(e) None of these
6. In latest generation computers, the instructions are executed
(a) Only parallel
(b) Only sequentially
(c) Both ‘1’ and ‘2’
(d) Either ‘1’ or ‘2’
(e) None of these
7. Who designed the first electronics computer – ENIAC?
(a) Von Neumann
(b) Joseph M Jacquard
(c) Presper Eckert and John W Mauchly
(d) All of the above
(e) None of these.
8. Which of the following terms is just the collection of networks that can be joined together?
(c) Intranet
(d) Extranet
(e) Internet
9. What type of device is a computer mouse?
(a) Storage
(b) Output
(d) Output/Input
(e) Software
10. A hardware device which converts data into meaningful information is called
(a) Protector
(b) Output device
(c) Input device
(d) Program
(e) Processor
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