Perfect Computer Notes

Q1. Define computer, explain characteristics of a computer. Computer is an electronic machine that takes data and instructions, processes data according to the given instructions, gives results and stores them. Characteristics of Computer :   1. Speed 2. Storage 3. Processing 4. Accuracy 5. Recalling 6. Communication 7. Versatile 7. No Feelings 9. No Intelligence Q2. Explain uses of computer in different fields of life. OR Explain Impacts of Computer Technology on Society. 1. Uses of Computer at Home 2. Uses of Computer in Education 3.   Uses of Computer in Industry 4. Uses of Computer in Business 5 . Uses of Computer in Medical Field Q3. Write down a note on types of computer. Types of Computer Computers can be divided into the following types on the basis of their working: 1. Analog Computers Analog computer is used to measure continuous values. It measures a physical property like voltage, pressure, speed and temperature Analog computer is mainly used in the field of enginee

MMC stands for multimedia card. SD stands for secure digital card. System Bus  is used to connect main components of a computer such as cpu and main memory. A Port is an interface or a point of attachments. POS stands for Point Of Sale terminal. ATM stands for Automated Teller Machine. PIN stands for Personal identification number. Kbps stands for kilobits per second. Mbps stands for megabits per second. A port that transmits one bit at a time is called Serial Port. A type of port that transmits many bits at a time is called Parallel Port. LPT stands for Line Printer. Examples of system software are Operating System, Utility Programs and Device Drivers. Examples of operating systems are DOS, Windows, Unix and Linux. Examples of Utility programs are File Manager, Image Viewer, Disk Scanner and File Compressor. Software used to detect and remove viruses is called Antivirus . Examples of antivirus programs are Mcaffee, Avast,

(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