Practice Questions

Duration: 2 min

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Inside: a video lesson and guided study material.

Module outline

  1. About Course: About the Course
  2. Paper-2 | Programming & Data Structures: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling, Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  3. Paper-2 | Databases / DBMS & SQL: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, SQL, Relational Calculus, Transaction Management, Concurrency Control
  4. Paper-2 | Algorithms: Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Dynamic Programming, Minimum Spanning Trees, Shortest Path Algos
  5. Paper-2 | Computer Networks & Security: 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, Network Access Technologies, Network Security
  6. 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
  7. 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
  8. Paper-2 | Theory of Computation: Introduction to TOC, Deterministic FA (DFA), Non-Deterministic FA, Regular Expressions, Grammar, Regular Language Properties, Moore & Mealy Machines, Pushdown Automata & CFG, Turing Machines
  9. Paper-2 | Computer Organization & Architecture: Basics of COA, Cache Memory Organization, Input Output Organisation, Pipelining, Instr Formats & Modes, Control Unit Design, Programming the Basic Computer
  10. 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
  11. Paper-1 | General Awareness: Polity, Physics, Biology, Chemistry, Static General Knowledge, GK- Current Affairs, History, Geography, Indian Economy, Environment
  12. Paper-1 | Logical Reasoning: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Data Interpretation, Blood Relations, Syllogisms, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Selection Decision Table (Decision Making), Clock, Calendar, Cubes & Dices, Directions (Direction Test), Analogy, Seating Arrangements, Analytical Reasoning (Counting Figures Reasoning)
  13. Paper-1 | Quantitative Aptitude: Ratio and Proportion (Ratios), Mixture and Alligation, Permutation and Combination, Number System, HCF LCM, Speed Time and Distance, Average, Age Problems, Percentage, Profit and Loss, Time and Work, Pipe and Cistern, Simple Interest and Compound Interest, Powers and Exponents (Surds and Indices), Mensuration and Geometry, Probability, Statistics, Arithmetic, Algebra
  14. Paper-1 | English: Vocabulary, 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), Sentence Construction, Cloze Test (Cloze Passage)
  15. Coal India Previous Year Paper:
  16. Engineering Mathematics: Set Theory, Relations, Functions, Graph Theory, Group Theory, Propositional and Predicate Logic, Linear Algebra, Calculus
  17. Coal India Mock Test:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This short practice clip focuses on a single data-structures question: given the input sequence 5, 4, 3, 2, 1, identify which option is not a valid stack permutation (possible pop sequence). The slide lists four choices: a) 4,2,1,3,5; b) 5,2,3,4,1; c) 4,5,1,2,3; d) 3,4,5,2,1. The instructor underlines “possible pop sequence” as a cue and then uses hand-drawn stack diagrams to simulate push/pop operations for each option. Valid permutations are crossed out as they are verified, leaving the invalid sequence to be identified. The method shown is direct simulation: push input elements in order, pop when the top matches the next required output element, and reject any option that cannot be produced. Because only sampled screenshots are available, the final answer is not explicitly confirmed in the evidence; however, the progression demonstrates testing options a through d with stack traces and elimination.

Chapters

  1. 0:00 – 1:52 00:00-01:52

    The slide presents the question “if the input sequence is 5, 4, 3, 2, 1 then identify the wrong stack permutation (possible pop sequence)?” with options a) 4,2,1,3,5; b) 5,2,3,4,1; c) 4,5,1,2,3; d) 3,4,5,2,1. The phrase “possible pop sequence” is underlined in blue as a teaching cue. A hand-drawn stack outline appears and is filled with handwritten digits while the instructor simulates push/pop operations. Options are tested one by one using stack diagrams; valid permutations such as b and c are crossed out after verification, while annotations on a and d show partial traces. The core method is to trace the stack step by step and eliminate valid pop sequences until the wrong one remains.

The central concept is stack permutation validity: a pop sequence is possible if it can be generated by pushing input elements in the given order and popping when needed. The lesson uses a concrete multiple-choice example with input 5,4,3,2,1 and four candidate pop sequences. The teaching strategy is elimination by simulation: draw a stack, push the next input element if needed, pop when it matches the desired output, and continue until either the sequence is fully produced or a contradiction occurs. The instructor visually crosses out valid options, reinforcing that the “wrong” permutation is the one that cannot be simulated. This approach helps students avoid memorizing patterns and instead verify each option mechanically.

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