Computer Questions For Competitive Exams PDF Download

Computer Questions For Competitive Exams PDF Download

Computers Important Questions For Exams

History Of Computers Asked In IBPS SSC Exams–The word Computer in earlier times meant a person who performed calculations or computations. With years its definition changed to a machine that performs calculations. It can   perform all   type of   mathematical and   logical operations;  it can  accept data,  store data,  retrieve data, process data and produce output.Hope this computer knowledge questions and answers will help you in your exams and please share this computer questions for competitive exams pdf download topic by which other your friends will get the information about this topic.

Charles  Babbage was  known as the father of the computer.  He invented  two   machines  in  1822  introduced  Difference Engine and in 1834, introduced Analytical engine

Generation of Computer


Subject 1st generation 2nd generation 3rd generation 4th generation 5th generation
Period 1940-1956 1956-1963 1964-1971 1971-present present & beyond
Circuitry Vacuum tube Transistor Integrated chips (IC) Microprocessor


ULSI (Ultra Large

Scale Integration)


Memory Capacity 20 KB 128KB 1MB Semiconductor type and very high VLSI and ULSI
Processing Speed 300 IPS inst. Per sec. 300 IPS 1MIPS(1 million inst. Per


Faster than 3rd


Very fast




High-level language



C,C++ C,C++,Java All the Higher level languages,

Neural networks,

Example of computers UNIVAC, EDVAC IBM 1401, IBM

7094, CDC 3600,D UNIVAC 1108

IBM 360 series,

1900 series

Pentium series

Multimedia, Stimulation


Intelligence, Robotics


ENIAC was the first digital computer and it was invented by J.Presper Eckert and John Mauchly at the University of Pennsylvania and began construction in 1943. It uses 18000 vacuum tubes as a storing device. They were also founders of the first computer company, it was initially named Electronic Controls  Company which  was later  changed to  Eckert–Mauchly Computer Corporation and released a series of mainframe electronic digital   stored-program computer under the name of UNIVAC.

MIT introduces the whirlwind machine (first computer with(RAM) on March 8, 1955.

Classification Of Computers —  computer knowledge questions and answers

Computer Questions For Competitive Exams PDF Download.jpg

Computer Questions For Competitive Exams PDF Download


Analog computer  introduced by  Lord  Kelvin.  Numerical data are represented by measurable physical variables such as electrical voltage. A thermometer is a simple analog computer.

Digital computer that accepts and process data in the form of numbers and all the character are converted into binary


The hybrid computer used the combined feature of the analog and digital machine. you can see the hybrid computer in geological departments.

Microcomputer these are small relatively inexpensive computer designed for personal and office use. It has lowest

storing and  processing speed.  These can  be laptop  or desktop.

Minicomputer powerful  as  compare to  microcomputer it

Has higher  memory provide faster-operating  speeds and large storage capacities than microcomputers. It can be used as a server and capable of supporting from 2 to 200 users. Mainframe   computer   it   has   very   high   memory   and processing   speed   and   used   as   a   server   (can   support thousands of users)

The supercomputer can be used for a complex type of application i.e. specific research, weather forecasting, Weapon designing etc.

CDC 6600 was the first successful supercomputer.

Sunway TaihuLight of China is the fastest supercomputer in the world.

PARAM-8000 India’s first Super Computer developed by C-DAC Pune in 1998.

Shasra T is considered as India’s fastest supercomputer, manufactured by Indian Institute of Science.

Servers are dedicated computers that serve the needs or request of other programs or computer.

Workstations serve usually one user only.

Information appliances are computers specially designed to perform a specific “user-friendly” function—such as playing music, photography.

An embedded   system is   a   computer system   with a dedicated function within a larger system.

Computer Questions For Competitive Exams PDF Download.jpg

Computer Questions For Competitive Exams PDF Download

Hardware and I/O Devices – Computers Important Questions For Exams

A computer is an electronic device that accepts data from the user (input), processes the data by performing calculations and operations on it and generates the desired Output.

An unprocessed  collection or  representation of  raw  facts represented in a manner suitable for communication, interpretation or processing by humans or by automatic means, is known as Data.

Personal computers use a  number of chips mounted on a main circuit board called Motherboard.   A motherboard is the physical arrangement in a computer that contains the computer’s basic circuitry and components.


An output device is any piece of computer hardware equipment used to communicate the results of data processing carried out by an information processing system (such as a computer) which converts the electronically generated information into human-readable form.

The CPU is fabricated as a single Integrated Circuit (IC) chip. It is also known as the Microprocessor. Multiprocessor Computers uses two or more central processing units (CPUs) within a single computer system. The term also refers to the ability of a system to support more than one processor and/or the ability to allocate tasks between them.

The central processing unit (CPU) is the brain of your computer.  It  handles  all  the  instructions  you  give  your computer. The control unit (CU) is a component of a computer’s central processing unit (CPU) that directs operation of the processor. It tells the computer’s memory, arithmetic/logic unit and input and output devices how to respond to a program’s instructions.

An arithmetic logic unit (ALU) is a digital circuit used to perform arithmetic and logic operations. It represents the fundamental building  block  of  the  central  processing unit

(CPU) of a computer.

Instruction Execution: the program which is to be executed is a set of instruction which are stored in memory. The CPU executes the instructions of program to complete a task and this execution takes place inside the CPU with the help of registers ALU (arithmetic logic unit) and CU(control unit). When  the  processor  executes  instructions,  data  is temporarily stored in small local memory location and these are called registers.

Accumulator Register: – which stores the immediate result of arithmetic and logical operations.

Memory address register (MAR) : – which contain the address of memory location to which data is to be stored.

Program counter : – which contain the address of the next

instruction to process.

Instruction register: – which contain the current instruction being processed

A keyboard is a typewriter-style device, which uses an arrangement of buttons or keys, to act as mechanical levers or electronic switches. Most of the commonly available personal computers have a keyboard, popularly known as Qwerty.

Function Keys F1-F2
Toggle Keys Caps Lock, Num Lock,
Modifier Keys Shift, Alt, Ctrl, Fn
Alphanumeric Keys A-Z, 0-9


‘Caps lock’ and ‘Num lock’ keys are called as Toggle Keys because when pressed, they change their status from one state to another.

Numeric Keypad is a keypad located on the right hand side

of the keyboard. It consists of digits and mathematical operators.

A Modifier key is a special key (or combination) on a computer keyboard that  temporarily modifies  the  normal action of another key when pressed together. By themselves, modifier keys usually do nothing; that is, pressing any of the Shift, Alt, or Ctrl keys alone does not (generally) trigger any action from the computer.

Mouse is  the most popular input device which is  used today for interactive processing and for the one line entry of data  for  batch  processing.  The  first  computer mouse  was invented by Douglas Engelbart.

Drag and Drop refers to the action of clicking and holding down the mouse button, while moving the mouse and then releasing the mouse button.

The data that is fed into a computer processor, received into the computer by a keyboard or other sources is called Input. Examples of input devices include keyboards, mouse, scanners, digital cameras and joysticks.

Joystick is the device that moves in all directions and controls the movement of a pointer.

A Touch Screen is a type of display screen device that is placed on the computer monitor to allow direct selection or activation of the computer when the user touches the screen. It acts as both input and output device.

Light Pen is the pen shaped device, which can sense light and is used to point at spots on a video screen.

A   technology   enables   a   high-speed   reading   of   large quantities   of   data   and   transferring   these   data   to   the

computer without using a keyboard. It is referred as Optical Mark Reader (OMR). It uses a beam of light that is reflected on the paper with marks, to capture presence and absence of marks.

MICR reads the characters by examining their shapes in a matrix form and the information is then passed `on to the computer. MICR stands for Magnetic Ink Character Reader. It provides a high level of security and is therefore used by the banking industry for faster processing of the cheque.


Bar Code is a machine readable code, which is represented by parallel vertical lines with varying widths. For reading these bar-coded data, a device is used, which is known as a Bar Code Reader (BCR)


Optical Character Recognition (OCR) is used to scan the document containing text. It is the mechanical or electronic conversion of scanned or photographed images of typewritten  or  printed  text  into  machine- encoded/computer-readable text.

Computers Important Questions For Exams

A point of sale terminal (POS terminal) is an electronic device used to process card payments at retail locations.


The device that prints information from the computer onto the paper is Printer.

The printed form of output is referred as Hard Copy. The form of output displayed on the screen is referred as Soft Copy.

Pages per Minute (PPM) is the unit used to count the speed of the printer.

On the  basis  of  technology,  printers  are  categorized  into Impact and Non- Impact Printers.


Computer Questions For Competitive Exams PDF Download

Impact printers create an image by using some mechanism to physically press an inked ribbon against the page, causing the ink to be deposited on the page in the shape desired.

  1. I) Dot matrix : – The dot-matrix printer uses print heads containing from 9 to 24 pins. These pins produce patterns of dots on the paper to form the individual characters


  1. II) Daisy wheel: – A hammer strikes a “petal” containing a character against the ribbon, and the character prints on the paper. Its speed  is  slow  typically  25-55  characters  per secon


III) Line printer: – Line printers, or line-at-a-time printers, use special mechanism that can print a whole line at once; they can typically print the range of 1,200 to 6,000 lines per minute


  1. IV) Drum printer: – A drum printer consists of a solid, cylindrical drum that has raised characters in bands on its surface. The number  of  print  positions  across  the  drum equals the number available on the page.


  1. V) Chain printer: – A chain printer uses a chain of print characters wrapped around two pulleys


  1. VI) Band printer: – Band printer has a steel band divided into five sections of 48 characters eac


Non  –  Impact  Printers  do  not  touch  the  paper  when creating an image.


  1. I) Ink-jet printers: – One or more nozzles in the print head emit a steady stream of ink dr Droplets of ink are electrically charged after leaving the nozzle. The droplets are then guided to the paper by electrically charged deflecting plates


  1. II) Laser printers: – Laser printers use buffers that store an entire page at a time. When a whole page is loaded, it will be printe


III)Thermal printer: – is a digital printing process which produces a printed image by selectively heating coated thermo chromic paper, or thermal paper as it is commonly known, when the paper passes over the thermal print head.


A plotter is an output device that interprets commands from a  computer to  make line  drawings on  paper with  one  or more automated pens. Unlike a regular printer, the plotter can   draw   continuous  point-to-point  lines   directly   from vector graphics files or commands.


An uninterruptible power supply (UPS) is a device that allows a computer to keep running for at least a short time when the primary power source is lost.


A Monitor is a TV-like display attached to the computer on which the output can be displayed and viewed. It can either be a monochrome display or a color display. The number of pixels displayed on a screen is known as Resolution.

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Computer Questions For Competitive Exams PDF Download

computer questions for competitive exams pdf download

computer awareness questions and answers pdf free download

computer knowledge questions and answers

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