Syllabus by chapter · অধ্যায়ভিত্তিক সিলেবাস

Computer Fundamentals · 76 questions: System Software vs Application Software, Functional Units of a Computer, Full Forms: VIRUS, DOS, SSD, Monitoring a Growing Log File (tail -f), Growth of Technology Adoption in Financial Services, Common ICT Acronym Meanings
Internet & Email · 10 questions: ইন্টারনেট সার্ভিস প্রোভাইডার (ISP)-এর দায়িত্ব, Verifying a Company Website, History and Access of the Internet
e-Governance & Digital Bangladesh · 4 questions: E-Commerce in Bangladesh — A Composition, E-commerce Platforms — Examples, Types of E-Commerce
Security & Data · 17 questions: Incremental vs Differential Backup, BDCCL — Bangladesh Data Centre Company Limited, National Data Center (NDC), Bangladesh, Data vs Information, Common ICT/Telecom Full Forms, VIRUS, BIOS, DoS, OSPF, DVD, WiFi
Storage & Number Systems · 5 questions
Mixed Topics · 214 questions: Plagiarism, Electric Field vs Magnetic Field; Coulomb's Law, Phase Velocity and Group Velocity, Norton's Theorem, Transformer Working Principle, Kirchhoff's Current and Voltage Laws

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Start learning: Introduction to Computers and Their Generations · কম্পিউটার পরিচিতি ও কম্পিউটারের প্রজন্ম

Introduction to Computers and Their Generations

A computer is the single most important machine of the modern age, and almost every government job examination in Bangladesh — BCS (both preliminary and written), Bank (Officer / Senior Officer), and IT-officer / Assistant Programmer posts — opens its Computer/ICT section with this topic. Questions on what a computer is, its characteristics, its functional units, its history, and above all its five generations appear year after year, often as one-mark multiple-choice items where a single date, inventor's name, or the underlying electronic component decides the answer. This lesson builds the topic from first principles so that you not only memorise the facts but truly understand why each generation is defined the way it is.

Learning objectives

By the end of this lesson you should be able to:

Define a computer precisely and explain the Input–Process–Output–Storage (IPOS) cycle.
Distinguish data from information, and state the key characteristics of a computer (speed, accuracy, diligence, versatility, storage, automation) along with its limitations (GIGO, no IQ).
Draw and label the block diagram of a computer and explain the role of each functional unit (input, memory, ALU, control unit, output) in the von Neumann architecture.
Classify computers by working principle (analog, digital, hybrid) and by size/capacity (super, mainframe, mini, micro).
Trace the history of computing devices from the abacus to UNIVAC and name the key inventors.
Describe the five generations of computers — the defining electronic component, period, languages, example machines, and merits/demerits of each.
State and apply Moore's Law and convert between computer speed and memory units.

Read the whole lesson free with an account · পুরো পাঠ পড়তে বিনামূল্যে সাইন আপ করুন

All 7 lessons · সব পাঠ

Introduction to Computers and Their Generations · কম্পিউটার পরিচিতি ও কম্পিউটারের প্রজন্ম
Number Systems and Base Conversions · সংখ্যা পদ্ধতি ও বেস রূপান্তর
Data Representation: BCD, ASCII, Unicode and Two’s Complement · ডেটা রিপ্রেজেন্টেশন: BCD, ASCII, Unicode ও টু’স কমপ্লিমেন্ট
Input, Output and Storage Devices · ইনপুট, আউটপুট ও স্টোরেজ ডিভাইস
Memory Hierarchy and Types of Memory · মেমরি হায়ারার্কি এবং মেমরির প্রকারভেদ
System Software and Application Software · সিস্টেম সফটওয়্যার ও অ্যাপ্লিকেশন সফটওয়্যার
IT Acronyms, MS Office and Productivity Tools · আইটি সংক্ষিপ্ত রূপ, MS Office ও প্রোডাক্টিভিটি টুল

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