Perfect Computer Notes

(70)10 = (1000110). [ divide 70 by 2 repeatedly until quotient is zero, write down remainders from bottom to top.] NTFS is abbreviation for new technology file system     . USB stands for Universal serial Bus. AGP stands for Accelerated graphical port. Roman number system is an example of non-positional number system. PPP stands for point-to-point protocol. SCSI is pronounced as Small computer system interface. MS Excel is an example of Applications software. Windows is an example of          system           software. WAN as a network stands for    wide area network. DNS stands for Domain name server. CPS stands for   Character per second. BIOS stands for   Basic input-output system. LCD stands for Liquid crystal display     . POST stands for   ­­­­­­­­­­­­­­­­­­­­­­­­­_Power  ON Self Test How many rows are in MS Excel _65536. Modem stands for Modulator and demodulator. CPM stands for Character per minute ENIAC stands for Electro

FTP stand for     file transfer protocol. Lady ADA is the mother of computer.    VINT CERF     is the father of Internet. Nibble consists of   4   bits.   Google     and   Yahoo   are the two search engines. TCP/IP stands for Transmission control protocol/Internet protocol. One sector on Hard Disk holds   512    bytes.   Dos, window and UNIX are three operating systems. Demodulation converts Analog signal into Digital signal. ARPANET stands for advanced research project agency network. URL stands for uniform resource locator . Charles Babbage is the father of computer. Lady ADA is the first computer programmer. Nibble contains 04 numbers of bits. Name Two Mail service mail Yahoo.com. VOIP stands for Voice over internet protocol. One sector holds 512 numbers of bytes. Name two different Operating systems DOS and Windows. The process of demodulation converts digital signal into analog signal. URL st

what are the advantages and disadvantages of internet Internet has many advantages for users along with some disadvantages too. Let us discuss the benefits of using Internet first. ADVANTAGES OF INTERNET what are the advantages and disadvantages of internet Following are the main advantages of internet: 1. THE WORLD WIDE WEB This is also called web or www or 3w. The collection of all web pages in all web sites on internet is called www. These web pages provide us information. 2. E-MAIL E-mail stands for electronic mail. It is the most popular, cheap, easy and fastest mailing service. We can send and receive messages on internet with in seconds or minutes. 3. NEWSGROUPS Newsgroups are discussion groups on internet. They are used for free exchange of information. 4. MAILING LISTS Mailing lists provide information to the users on the selected topics through email. Mailing lists are maintained by different companies. 5. ONLINE BANKING Several banks are onlin

SERVICES PROVIDED BY INTERNET Important services provided by internet are as the following: 1. THE WORLD WIDE WEB This is also called web or www or 3w. The collection of all web pages in all web sites on Internet is called www. These web pages provide us information in the form of text, pictures, audio and video formats etc. 2. E-MAIL E-mail stands for electronic mail. It is the most popular, cheap, easy and fastest mailing service. We can send and receive messages on internet with in seconds or minutes. 3. EMAIL DISCUSSION GROUPS These are used to discuss different topics with other people by email. 4. NEWSGROUPS Newsgroups are discussion groups on internet. They are used for free exchange of information. A user sends a message to the news group site. Other users read this message from this site and reply. Newsgroups are provided by special computers called news servers. 5. ECOMMERCE It stands for Electronic Commerce. E-commerce means to carry out business dealings by internet

INTERNET Internet is the network of networks around the world. It is made up of thousands of smaller networks. It is a global communication system. We can send and receive information from a city or country to another through Internet. Main components of Internet are computers, communication media and modem etc. Modem is used to send and receive information though telephone lines.     Internet provides following main facilities:                ·    E- mail                ·    Chat                ·    Searching jobs                ·    Advertising for business                ·    E-commerce                ·    Searching information To use Internet we must have  ·    suitable computer  ·    telephone line  ·    modem  ·    web browser (for example, internet explorer)  ·    Internet connection or scratch card of an ISP HISTORY OF INTERNET 1) ARPANET   The seeds of internet were planted in 1969 by Advanced Research Projects Agency (ARPA) of US department of

NEED OF ELECTRONIC DATA PROCESSING Today, no business can exist without information . There is no more business without information. To improve the business there is a need to improve data processing and information system. Now it’s the age of competition that involves information technology for faster and accurate data processing . These days computer is playing a main role in every field of life. It is also playing a central role in business . In business, a large amount of data has to be processed daily. It is impossible to process such a large amount of data without a computer. Explain importance / need of electronic data processing in business We know that a computer can process data accurately and quickly. The need of data processing in business is clear. Following are the reasons: 1) RECORD KEEPING An organization cannot exist without records. Record keeping is a difficult and complex problem. Electronic data processing has simplified it. Receiving, storing, pro

Today we will discuss different types or levels of data processing in detail. Let us define Data processing first. DATA PROCESSING Data processing is the sequence of operations performed on data to convert it into useful information . These operations may be arithmetic, statistical or logical operations. We can arrange or classify data. We can send and receive data from one point to another. Explain different types of data processing TYPES OF DATA PROCESSING (OR) LEVELS OF DATA PROCESSING) There are three types of data processing . 1) Manual data processing 2) Mechanical data processing 3) Electronic data processing We may also use the term Levels of data processing. First level of data processing was manual data processing when there were no calculating devices (before the invention of calculators). Therefore all processing jobs were performed manually by hand with the help of pen , paper and mind. In second level of data processing, machines like calculat

DATA Data is the collection of raw facts and figures. It is without any proper meaning. Data may be collection of words, numbers, graphics or sounds. What is data? Explain different types of data Examples of Data 1) Student Data on Admission Forms When students get admission in a college. They fill admission form. This form     contains raw facts (data of student) like name, father’s name, address of student etc. 2)    Data of Citizens During census, data of all citizens is collected. 3)    Survey Data Different companies collect data by survey to know the opinion of people about their product. 4)    Students Examination data In examination data about obtained marks of different subjects for all students is collected.    Different Types Of Data There are following main types of Data. 1)    NUMERIC DATA Numeric data consists of 0 to 9 digits, + and – sign and decimal point etc. For example, 10, 78, 90.50, -56 etc 2)    ALPHABETIC DATA It consists

After collecting data, it is processed to convert into information. The data is processed again and again until accurate result is achieved. This is called data processing cycle . Data processing cycle involves following three basic activities: Major Activities Involved in Data Processing Cycle Explain Data processing cycle 1. Input 2. Processing 3. Output 1. INPUT It is the process in which collected data is given to computer after converting into binary form. Input step can be further divided into following steps: i) Planning Here objectives of data processing are defined. For example, in examination system, objective is to process student examination data to get result cards. ii) Data Collecting Here data is collected. Data is the raw material for data processing. This must be accurate for getting accurate results. iii) Input Here data is entered into computer. iv) Verification Here collected data is verified to determine whether it is valid for

Topic: Differences Between Data and Information - 14 Differences Here we are going to discuss the differences between two typical terms of information technology: Data and Information . Data is a collection of raw facts and figures about an entity . Data may consist of numbers, characters, audio, video or pictures etc. When these data is processed according to requirements, then it is transformed into INFORMATION . Differences between data and information with examples For example, consider Admission system of a Computer College. The candidates will submit admissions forms filled by them. Now all the facts and figures and picture of candidate on form is called data. These data may consist of name, father's name, date of birth, marks obtained, total marks, address, contact number and a latest photo graph of the candidate. Now the concerned person in the college office will process these data to prepare a merit list. He may calculate percentage of obtained marks of eac