Practice Questions

Duration: 4 min

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Inside: a video lesson and guided study material.

Module outline

  1. About Course: About the Course
  2. Paper 2 | Digital Logic: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits, Number System, Number Representation, Floating Point Rep
  3. Paper 2 | Computer Organization And Architecture: Basics of COA, Cache Memory Organization, Input Output Organisation, Pipelining, Control Unit Design, Instr Formats & Modes, Programming the Basic Computer
  4. Paper 2 | Analog And Digital Communication: Introduction to Communication Systems & Random Signals, Analog Communication Systems, Information Theory & Digital Communication Fundamentals, Digital Modulation & Detection Techniques, Error Control, Synchronization & Multiple Access Techniques
  5. Paper 2 | Programming in C: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling
  6. Paper 2 | Data Structures And Programming: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing, Java, OOPS with C++, Java Fundamentals, Array, String, IO & References
  7. Paper 2 | Algorithms: Algorithm Analysis, Sorting Algorithms, Time Complexity Analysis, Greedy Algorithms, Dynamic Programming, Minimum Spanning Trees, Shortest Path Algos
  8. Paper 2 | Compiler Design: Intro to Compilers, Lexical Analysis, Grammar & CFG, Syntax Analysis: Top-Down, Syntax Analysis: Bottom-Up, Semantic Analysis & SDT, Intermediate Code Gen, Code Optimization, Run Time Environment
  9. Paper 2 | Operating System: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Threads & Process Creation, Deadlock, Memory Management, Virtual Memory, Disc Scheduling, File Management, Unix OS, Linux OS
  10. Paper 2 | Databases: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, Relational Algebra, SQL, Relational Calculus, File Organization & Indexing, Transaction Management, Concurrency Control
  11. Paper 2 | Information Systems and Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  12. Paper 2 | Computer Networks: Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, DLL: Error Control, DLL: Framing, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Net Layer:Routing Protocol, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware Basics
  13. Paper 2 | Internet & Web Technologies: Website, Browser & Services, Internet Fundamentals, Web Design & Development, Protocols & Services, Web Publishing & Hosting, Server Side & Security, Emerging Technologies, HTML Basics, JavaScript-Basics, CSS, XML, HTML5
  14. Paper 2 | Cyber Security And Emerging Technologies: Emerging Tech Trends
  15. Paper 2 | Cloud Technology: Cloud Computing
  16. Paper 2 | Probability and statistics: Probability, Statistics
  17. Paper-1 English: Vocabulary, Preposition, Articles, Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Sentence Correction (Error Correction), Sentence Completion (Fill in the blanks), Cloze Test (Cloze Passage), Sentence Construction
  18. Paper 1 General Mental Ability & Logical reasoning: Ratio and Proportion (Ratios), Divisibility Rules, Data Interpretation, Mixture and Alligation, Permutation and Combination, Logarithm, Number System, HCF LCM, Sequence and Series (Series), Speed Time and Distance, Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Data Sufficiency, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Percentage, Average, Powers and Exponents (Surds and Indices), Algebra, Profit and Loss, Simple Interest and Compound Interest, Time and Work, Pipe and Cistern, Mensuration and Geometry, Mental Ability, Age Problems, Partnership, Arithmetic, Speed Mathematics and Basic Mathematics, Syllogisms, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Seating Arrangements, Blood Relations, Directions (Direction Test), Analytical Reasoning (Counting Figures Reasoning), Puzzle Solving (Puzzles), Calendar, Clock, Cubes & Dices, Selection Decision Table (Decision Making), Logical Sequence Of Words, Venn Diagram, Analogy
  19. Paper-1 General Knowledge & Current Affairs: State Wise GK, History, Geography, GK- Current Affairs, Static General Knowledge
  20. Full Length Mock Test:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

The lecture focuses on calculating the total time required to transfer a file stored on a disk, specifically comparing contiguous and non-contiguous allocation strategies. The problem provides specific disk parameters: 8 sectors per track, 512 bytes per sector, a rotation speed of 3000 rpm, and an average seek time of 15ms. The file size is defined as requiring 8 sectors. The instructor systematically breaks down the components of disk access time: Seek Time (ST), Rotational Latency (RL), and Transfer Time (TT). He demonstrates the calculation for non-contiguous allocation, where each sector requires a separate seek and latency operation, contrasting it with the efficiency of contiguous allocation where data is stored sequentially.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The instructor introduces the problem statement visible on the screen, which asks for the total time to transfer a file requiring 8 sectors. He begins by analyzing part (b) Non-contiguous allocation. He writes the general formula for total time as the sum of Seek Time (ST), Rotational Latency (RL), and Transfer Time (TT). He then calculates the Rotational Latency based on the 3000 rpm speed. He converts rpm to rotations per second (3000/60 = 50) and determines the time for one full rotation (1000ms/50 = 20ms). Consequently, the average rotational latency is half of that, which he writes as 10ms on the board. He explicitly writes "10 ms" under the RL term in his formula.

  2. 2:00 – 3:36 02:00-03:36

    Continuing with the non-contiguous allocation calculation, the instructor explains that since the file requires 8 sectors and they are non-contiguous, the disk head must seek and wait for rotation for each sector individually. He writes the expression 8 (15ms + 10ms), representing 8 times the sum of seek time (15ms) and rotational latency (10ms). He then calculates the Transfer Time (TT). Since there are 8 sectors per track and the file is 8 sectors, the transfer time equals the time for one full rotation, which is 20ms. He writes 8/8 * 20ms = 20ms. Finally, he sums the components: 8 * 25ms + 20ms, resulting in a total time of 220ms. He writes "220ms" as the final answer on the board.

The lesson effectively demonstrates how disk allocation strategies impact performance. By calculating the time for non-contiguous allocation, the instructor highlights the overhead of multiple seek and latency operations. The final result of 220ms serves as a concrete example of the inefficiency compared to contiguous allocation, where the seek and latency would only occur once. This reinforces the importance of file system design in optimizing I/O operations.

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