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Download IBPS COMPUTER CAPSULE -    Capsule (IBPS...Most Expected 400 MCQ 26. Computer Capsule – IBPS PO, RRB  Clerk Mains Exam ... Computer Capsule – IBPS PO, RRB  Clerk Mains Exam

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    Inventions & Discoveries

    Introduction of Computer

    Computer Memory


    Important Single Linear

    Most Expected 400 MCQ

  • Important Inventions & Discoveries 1

    Generation of Computers 2

    Computer Memory 2

    Types of Computer 5

    Operating System 6

    Computer Network 7

    d Servers 8

    d Network Devices 11

    d OSI Model 11

    d IP Address 13

    d Some Important Networking Terminology 13

    Number System 16

    M.S. Word/Excel Shortcuts 17

    Single Linear Questions 18

    Important Abbreviations 25

    Most Expected 400 MCQ 26

  • Computer Capsule IBPS PO, RRB & Clerk Mains Exam

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    Father of Computer Charles Babbage

    First Modern Computer in the World- ENIAC

    Inventor of Punch Cards in Computer Hollerith

    Computer Graphics was developed by William Fetter

    ARPANET was developed by DARPA

    Compiler was developed by Dr. Grace Murray Hopper

    Father of Computer Animations- John Whitney

    Keyboard was invented by- Christopher Latham Sholes

    Laptop Computer was invented by Adam Osborne

    First GUI Computer Game was invented by- A.S. Douglas

    Computer BIOS was invented by Gary Kildall

    Inventors of Computer Chip Jack Kilby & Robert Noyce

    Father of Computer Hard Disk- Reynold Johnson

    Inventor of First Data Base Dr. Edgar Frank Codd

    Inventor of Computer Scanner Ray Kurzweil

    Inventor of Computer Speakers- Abinawan Puracchidas

    Inventor of MS-DOS Operating Systems- Microsoft

    Founder of Apple Computers Steve Jobs

    Founder of Artificial Intelligence John McCarthy

    Founder of Bluetooth Ericsson

    Father of C Language Dennis Ritchie

    Father of C++ language Bjarne Stroustrup

    Founder of Email Shiva Ayyadurai

    Founder of Google Larry Page and Sergey Brin

    Founder of Internet Vint Cerf

    Father of Java - James Gosling

    Founder of Linux Linus Torvalds

    Founder of Microsoft Bill Gates and Paul Allen

    Founder of Mobile Phones Martin Cooper

    Founder of Mouse Douglas Engelbart

    Founder of Php Rasmus Lerdorf

    Founder of USB Ajay V.Bhatt

    Founder of WWW Tim Berners-Lee

    Founder of Yahoo Jurry Yang and David Filo

    First Commercial Computer UNIVAC

    ENIAC and UNIVAC was developed by John Mauchly and J. Presper Eckert

  • Computer Capsule IBPS PO, RRB & Clerk Mains Exam

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    Period 1940 1956 1956 1963 1964 1971 1972 2010 2010-till date

    Components Vacuum Tubes Transistor Integrated

    Circuits ICs


    Large Scale ICs

    Silicon Chips,




    IBM-1401 IBM-370 PDP 11 NoteBook


    There are two basic components of computer, Hardware and Software.

    1. Hardware- physical components of the computer system are called as hardware. For example- Mother Board, Input

    Devices, Output Device, Storage Devices

    Input Devices are used to enter the input i.e. the data and instructions into the computers main memory. Examples-

    keyboard, Mouse, scanner, BCR, OMR, OCR, Light Pen, Joysticks,Etc..

    Output Device are used to produce data and information generated by computer .for example- Moniter, Printer, speaker,

    Plotter, Etc.

    2. Software- Software is a sequence of instructions designed to direct the computer to perform certain functions. It is

    generally classified into three categories:

    (i) System Software-: This type of software is required to use the computer efficiently and conveniently. For example-

    Operating System, Drivers etc.

    (ii) Application Software-: This software is designed to do certain tasks for an organization. For example Ms.Office, Payroll

    system to calculate salaries of the employees, etc.

    (iii) Utility Software-: It is designed to analyze, configure and maintain a computer. For example- Antivirus, etc.

    Computer memory is the storage space in computer where data is to be processed and instructions required for processing are


  • Computer Capsule IBPS PO, RRB & Clerk Mains Exam

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    1. Primary Memory

    2.Secondary Memory

    Primary Memory (Main Memory)- Primary memory holds

    only those data and instructions on which computer is currently

    working. It has limited capacity and data is lost when power is

    switched off. It is generally made up of semiconductor device.

    These memories are not as fast as registers. The data and

    instruction required to be processed reside in main memory. It

    is divided into two subcategories RAM and ROM.

    Characteristics of Main Memory-

    These are semiconductor memories, It is also known

    as main memory.

    Usually volatile memory.

    Data is lost in case power is switched off.

    It is working memory of the computer.

    Faster than secondary memories.

    Secondary Memory(Auxiliary Memory)- This type of

    memory is also known as external memory or non-volatilE. It is

    slower than main memory. These are used for storing

    data/Information permanently. CPU directly does not access

    these memories instead they are accessed via input-output

    routines. Contents of secondary memories are first transferred

    to main memory, and then CPU can access it. For example:

    disk, CD-ROM, DVD etC.

    Characteristic of Secondary Memory

    These are magnetic and optical memories It is known

    as backup memory.

    It is non-volatile memory.

    Data is permanently stored even if power is switched


    It is used for storage of data in a computer.

    Computer may run without secondary memory.

    Slower than primary memories.

    RAM (Random Access Memory) is the internal memory of

    the CPU for storing data, program, and program result. It is a

    read/write memory which stores data until the machine is

    working. As soon as the machine is switched off, data is erased.

    RAM is volatile, i.e. data stored in it is lost when we switch off

    the computer or if there is a power failure. Hence, a backup

    Uninterruptible Power System (UPS) is often used with


  • Computer Capsule IBPS PO, RRB & Clerk Mains Exam

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    RAM is of two types

    1. Static RAM (SRAM) 2. Dynamic RAM (DRAM)

    Static RAM (SRAM)

    The word static indicates that the memory retains its contents as long as power is being supplied. However, data is lost when

    the power gets down due to volatile nature. SRAM chips use a matrix of 6-transistors and no capacitors. Transistors do not

    require power to prevent leakage, so SRAM need not be refreshed on a regular basis. There is extra space in the matrix, hence

    SRAM uses more chips than DRAM for the same amount of storage space, making the manufacturing costs higher. SRAM is

    thus used as cache memory and has very fast access.

    Dynamic RAM (DRAM)

    DRAM, unlike SRAM, must be continually refreshed in order to maintain the data. This is done by placing the memory on a

    refresh circuit that rewrites the data several hundred times per second. DRAM is used for most system memory as it is cheap

    and small. All DRAMs are made up of memory cells, which are composed of one capacitor and one transistor.

    Cache Memory

    Cache memory is a very high speed semiconductor memory which can speed up the CPU. It acts as a buffer between the

    CPU and the main memory. It is used to hold those parts of data and program which are most frequently used by the CPU.

    The parts of data and programs are transferred from the disk to cache memory by the operating system, from where the CPU

    can access them.

    ROM (Read Only Memory)

    ROM stands for Read Only Memory. The memory from which we can only read but cannot write on it. This type of

    memory is non-volatilE. The information is stored permanently in such memories during manufacture. A ROM stores such

    instructions that are required to start a computer. This operation is referred to as bootstrap. ROM chips are not only used in

    the computer but also in other electronic items like washing machine and microwave oven.

    MROM (Masked ROM)

    The very first ROMs were hard-wired devices that contained a pre-programmed set of data or instructions. These kind of

    ROMs are known as masked ROMs, which are inexpensive.

    PROM (Programmable Read Only Memory)

    PROM is read-only memory that can be modified only once by a user. The user buys a blank PROM and enters the desired

    contents using a PROM program. Inside the PROM chip, there are small fuses which are burnt open during programming. It

    can be programmed only once and is not erasable.

    EPROM (Erasable and Programmable Read Only Memory)

    EPROM can be erased by exposing it to ultra-violet light for a duration of up to 40 minutes. Usually,