9th Computer Short Questions 564o64

Computer Short Questions 9th Class

Chapter: 1

Introduction to Computers

Q.1. What is Computer? Ans. Computer is an electronic device that processes data and converts it into information and gives us results accordingly. Q.2. What is an ABACUS? Ans. Abacus, a wooden frame of wires and beads, was made by Chinese about 2000 years ago for simple addition. Q.3. What is Napier’s Bones? Ans. John Napier created a device using rods to perform arithmetic calculations that is called Napier’s Bones. Q.4. What do you know about Pascaline Calculator? Ans. Pascal invented a machine that had a system of gears. Numbers could be entered and cumulative sums obtained by cranking a handle. Q.5. Who made the Difference Engine? Ans. Charles Babbage designed an automatic mechanical calculating machine that he called a difference engine. Q.6. What is Analytical Engine? Ans. Charles Babbage constructed a general purpose, fully program-controlled, automatic mechanical digital computer that is called analytical engine. Q.7. What is the use of Punched Cards and who made it? Ans. In 1890, Herman Hollerith developed the first electro-mechanical punched card tabulator that could read information that had been punched into cards. Q.8. Who made ENIAC? Ans. In 1942, P.Eckert, John W. Mauchly decided to build a high-speed electronic computer that is known as ENIAC. Q.9. What is the modern idea of Stored-program and who proposed it? Ans. John Von Neumann gave the modern idea of stored-program and according to him “Data and program can be stored in the same memory. Thus the machine can itself alter either its program or internal data”. Q.10. Write the Technologies and Computers of Computer Generations. Ans. Generation Technology Computers G-1 Vacuum Tubes ENIAC & UNIVAC-I G-2 Transistors IBM7094,1400 Series G-3 Integrated Circuits UNIVAC 9000,IBM 370 G-4 Microprocessor Apple Macintosh, IBM PC G-5 Artificial Intelligence Q.11. Name the first Digital Computer? Ans. In early 1940s, Aiken built the first general-purpose digital computer called Mark-I. Q.12. What is a Terminal? Asif Rasheed BS(HONS) Physics

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Computer Short Questions 9th Class

Ans. A terminal is a monitor and a keyboard connected to a mainframe computer to build a network. Q.13. What is meant by a Virtual Classroom? Ans. In a virtual classroom, the teacher deliver lecture at its own workplace while the students, connected to a network, may listen to him at their homes. They may put questions and answers are sent to them via email. Q.14. Define Universal Production Code. Ans. The sequence of lines that is read by a “Bar Code Reader”. The price of the item is stored in this code and these are automatically added to the bill. Q.15. Define Computer Simulation. Ans. Computer Simulation is the use of computer to represent the dynamic responses of system by the change in behaviors of another system modeled after it. Q.16. What is a Computer Program? Ans. The set of instructions to solve any kind of problem is called computer program. Q.17. Define Low Level Languages. Ans. These languages are quite close to the processor but not even understandable for human being e.g. machine language, assembly language. Q.18. Define High Level Languages. Ans. These languages are quite close the human languages like English language and far from machine language e.g. FORTRAN, BASIC, C/C++, VB. Q.19. What is an Assembler? Ans. Assembler is a program that translates an assembly language program into machine code. Q.20. What is a Compiler? Ans. Compiler is a program that translates a program written in high-level language into machine code. It reads the whole program before executing.

ABBREVIATIONS

⇒ ENIAC Electronical Numerical Integrator and Calculator ⇒ UNIVAC Universal Automatic Computer ⇒ IBM International Business Machine ⇒ IC Integrated Circuit ⇒ LSIC Large Scale Integrated Circuit ⇒ VLSIC Very Large Scale Integrated Circuit ⇒ AI Artificial Intelligence ⇒ PC Personal Computer ⇒ LCD Liquid Crystal Display ⇒ ATMs Automatic Transaction Machines ⇒ UPC Universal Production Code ⇒ Opcode Operation Code FORTRAN ⇒ Formula Translation ⇒ BASIC Beginners All-purpose Symbolic Instruction Code ⇒ COBOL Common Business Oriented Language ⇒ LISP List Processing) Language ⇒ VB Visual Basic Asif Rasheed BS(HONS) Physics # 03447846394

Computer Short Questions 9th Class

PDA

Chapter: 2

⇒

Personal Data Assistants

Computer Components

Q.1. What is a Program? Ans. The sequence of instructions given to computer for manipulating data is known as a program. Q.2. Define Electronic Data Processing. Ans. The process of performing arithmetic and logic operations with the help of computer is known as electronic data processing. Q.3. What is meant by Computer Hardware? Ans. The physical parts of the computer that you can touch and feel are known as computer hardware. Q.4. What is meant by Computer Software? Ans. The organized collections of computer data and instructions are called computer software. Q.5. What is Input Unit of computer? Ans. Input unit consists of input devices with which we send data to the central processing unit e.g. keyboard, mouse, scanner etc. Q.6. What is Output Unit of computer? Ans. Output unit consists of output devices with which we get results e.g. monitor, printer etc. Q.7. What is System Unit of computer? Ans. System unit consists of motherboard, microprocessor and the peripherals attached to it. Q.8. Define System Software. Ans. The programs that are responsible for controlling and managing the actual operations of the computer hardware are called system software e.g. operating system. Q.9. Define Application Software. Ans. The programs that are used to accomplish tasks specified by the are called application software e.g. word processing, spreadsheet etc. Q.10. Define the working of U. Ans. U is called the brain of the computer and the primary work of U is to convert data from input, process the data and giving results accordingly. Q.11. Define the working of ALU. Ans. ALU is the combination of Arithmetic and Logic unit and it performs all the mathematical and logical operations. Q.12. Define the working of CU. Ans. CU consists of circuitry that generates signals to direct the entire computer system to execute the programs and controls the flow of information through the processor. Asif Rasheed BS(HONS) Physics

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Computer Short Questions 9th Class

Q.13. What is meant by BUS? Ans. BUS is the common path that is used to send and receive data and commands to and from U and memory and all I/O devices. Q.14. What is Data Bus in Computer System? Ans. It is an electrical path that connects the central processing unit, memory, input/output devices and secondary storage devices. Q.15. What is Address Bus in the Computer System? Ans. It carries address information and connects only central processing unit and memory. Q.16. What is Control Bus in the Computer System? Ans. It carries control information from the control unit to the other units. Q.17. Define Computer Storage. Ans. Computer Storage is used to store programs and data. Q.18. Define Main Memory (RAM). Ans. It is a type of memory that stores data temporarily and data can be stored and retrieved much faster than the secondary storage. Q.19. Define Secondary Memory (ROM). Ans. It is a type of memory that stores data permanently and data can be stored and retrieved but not be re-written. Q.20. What is meant by PORT? Ans. A socket that enables an external device such as printer device to be attached to the computer. Q.21. Define Serial Port. Ans. Serial port allows s a serial hardware device to communicate with the computer by transmitting one bit of information at a time such as mouse, modems and keyboard. Q.22. Define Parallel Port. Ans. Parallel port lets an external parallel device communication with the computer by transmitting eight bits of data at a time and eight times faster than a serial port. Q.23. Define USB Port. Ans. USB is a Plug and Play hardware interface for peripherals such as the keyboard, mouse, joystick etc.

ABBREVIATIONS EDP U ALU CU I/O Devices RAM ROM USB COM Ports

⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒

Electronic Data Processing Central Processing Unit Arithmetic and Logic Unit Control Unit Input and Output Devices Random Access Memory Read Only Memory Universal Serial Bus Communication Ports

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Computer Short Questions 9th Class

P& P

⇒

Plug and Play

Chapter: 3

Input / output Devices

Q.1. Define Input Devices. Ans. The devices that are used to enter data and instructions into the computer are called input devices e.g. keyboard, mouse, microphone etc. Q.2. What is a QWERTY Keyboard? Ans. Keyboard is the standard input device used to enter textual data into the computer. Q.3. What are Alphanumeric Keys on Keyboard? Ans. The keys that are used to input alphabet (A-Z) and numbers (0-9) are called alphanumeric keys. Q.4. What are Numeric Keys on Keyboard? Ans. The keys that are used to input numbers are called numeric keys. Q.5. What are Function Keys on Keyboard? Ans. The keys consist of (F1 to F12) are called function keys and these keys provide shortcuts for doing routine tasks on a computer. Q.6. What are Cursor Control Keys on Keyboard? Ans. These four keys are used for moving the cursor from its current position to right, left, up or down. Q.7. What is a Mouse? Ans. A mouse is an input device that rolls around on a flat surface and controls the pointer on a display screen. Q.8. What is a Trackball? Ans. A trackball is a stationary pointing device that works like a mouse and contains a ball exposed on its surface. It is mainly used in portable computers. Q.9. What is a Joystick? Ans. Joystick is an input device used for games, computer aided designs or simulations. Q.10. What is a Scanner? Ans. A scanner is an input device that reads the image present on piece of paper and transfers the information into a computer where a program can store and interpret it. Q.11. What is a Microphone? Ans. A microphone is an input device used to digitally record audio data such as the human voice. Q.12. What do you know about Voice Recognition System? Ans. Voice recognition system use a microphone as an input device and converts a person’s speech into digital data by comparing the electrical patterns produced by the speaker’s voice with a set of prerecorded patterns stored in the computer. Q.13. What is meant by Discrete Speech? Ans. Voice recognition applications require each word to be separated by a distinct Asif Rasheed BS(HONS) Physics

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Computer Short Questions 9th Class

pause to determine where on e word begins and the next stops. This style of dictation is called discrete speech Q.14. What is a Light Pen? Ans. Light pen is a light-sensitive input device shaped like a pen. It is used to draw on the computer screen or to make menu selection. Q.15. What is a Digital Camera? Ans. Digital camera is a device that stores images digitally in its memory rather recording them on film. Q.16. What is a Disk Drive? Ans. A disk drive is a machine that reads data from and writes onto a disk. Q.17. Define Output Devices. Ans. The devices that are used to receive data and information from the computer are called output devices e.g. monitor, printer, speaker etc. Q.18. What is a Softcopy? Ans. An electronic version of a document stored on a storage device is called softcopy. Q.19. What is Hardcopy? Ans. The printed version of an electronic document is called hardcopy. Q.20. What is a Monitor? Ans. It is an output device that is used to get result in the form of image and text in different colors. Q.21. What is meant by resolution? Ans. The number of pixels on the screen expressed as a matrix is called resolution. Q.22. What is a CRT Monitor? Ans. A phosphors coated screen with three electron guns on its back is called CRT Monitor. Q.23. What is a LCD Monitor? Ans. LCD Monitor is commonly used in portable computer and it creates images with a special kind of liquid crystal that normally transparent but becomes opaque when charged with electricity. Q.24. Define Video Controller? Ans. Video controller is an intermediary device between the U and the monitor and determines the resolution of the monitor e.g. VGA and SVGA. Q.25. What is a Printer? Ans. Printer is an output device that produces hardcopy on the paper. Q.26. What are Impact Printers? Ans. Impact printers produce images by striking an inked ribbon with a hammer or a set of pins, pressing ink from the ribbon onto a piece of paper. Q.27. What are Non-impact Printers? Ans. Non-impact printers produce images on paper without striking the page in any way. Q.28. What is a Plotter? Ans. Plotters are used as output device and print a large drawing or image(s). Asif Rasheed BS(HONS) Physics

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Computer Short Questions 9th Class

Q.29. Ans. Q.30. Ans.

What is meant by CDR? A CDR is a drive that allows for recording information to a CDR disk. What is meant by CDRW? CDRW is a drive that can use both CDR and CDRW discs. These are the discs on which old data can be erased and new data can be written.

ABBREVIATIONS

OCR

⇒

Optical Character Recognition

HDD

⇒

High Density Disk/Hard Disk Drive

FDD

⇒

Floppy Disk Drive

CRT

⇒

Cathode Ray Tube

LCD

⇒

Liquid Crystal Display

VGA

⇒

Video Graphic Array

SVGA ⇒

Super Video Graphic Array

LPM

⇒

Line Per Minute

CAE

⇒

Computer Aided Education

CAD

⇒

Computer Aided Design

CAM

⇒

Computer Aided Manufacturing

CD

⇒

Compact Disk

CDR

⇒

Compact Disk Recorder

CDRW

⇒

Compact Disk Writer and Re-writer.

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