Stack Practice Questions

Duration: 4 min

This video lesson is available to enrolled students.

Return to /learn/UP-LT-GRADE-ASSISTANT-TEACHER-2025/cs-03-data-structures-and-algorithm/linked-list/structure-modification-pointer-logic/asset-stack-practice-questions-4976 after enrolling

Inside: a video lesson and guided study material.

Module outline

  1. About Course: About the Course
  2. CS | 01 | Digital Logic and Circuits and Discrete Mathematical Structures: Digital Systems & Boolean Basics, Number System, Number Representation, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits, Set Theory, Relations, Functions, Graph Theory, Group Theory, Propositional and Predicate Logic, Permutation and Combination
  3. CS | 02 | Computer Organization and Architecture: Basics of COA, Cache Memory Organization, Input Output Organisation, Pipelining, Instr Formats & Modes, Control Unit Design, Multiprocessors
  4. CS | 03 | Data Structures and Algorithm: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing, Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Dynamic Programming, Minimum Spanning Trees, Shortest Path Algos, Complexity Theory, Advanced Algorithms
  5. CS | 04 | Problem Solving through C Programming: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling
  6. CS | 05 | Object Oriented Techniques: Object Oriented Technology, Java
  7. CS | 06 | Operating System: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Threads & Process Creation, Deadlock, Memory Management, Virtual Memory, Disc Scheduling, File Management, Windows OS, Unix OS
  8. CS | 07 | Database Management Systems: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, Relational Algebra, SQL, Relational Calculus, Transaction Management, Concurrency Control, Database Recovery, Database Security & Authorization, Query Processing & Optimization, File Organization & Indexing
  9. CS | 08 | 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
  10. CS | 09 | Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  11. CS | 10 | Internet Technology, Web Design and Web Technology: Internet Fundamentals, Web Design & Development, Protocols & Services, Web Publishing & Hosting, Server Side & Security, Emerging Technologies, JavaScript-Basics, HTML Basics
  12. CS | 11 | System Analysis And Design: Fundamentals of Systems and Information Systems, SDLC and Development Approaches, Software Documentation and Software Requirements Specification (SRS), SDD and Quality Assurance, Security, Risk Management & Maintenance
  13. CS | 12 | Information Security and Cyber Laws: Cyber Threats and Malware Attacks, Role of Internet and Web Services, Security in Mobile and Wireless Computing, Electronic Data Interchange and E-Commerce, Physical Security and Cryptography Basics, Intrusion Detection Systems (IDS), Cyber Safety and Security
  14. CS | 13 | Computer Graphics: Basics of Computer Graphics, 2-D Geometrical Transforms and Viewing, 3-D Object Representation, Geometric Transformations and Viewing
  15. GS Paper | 01 | Indian and World Geography: Geography
  16. GS Paper | 02 | History: History
  17. GS Paper | 03 | Indian Economy & Social Development: Indian Economy
  18. GS Paper | 04 | General Science: Biology, Chemistry, वैज्ञानिक उपलब्धियाँ और अनुसंधान / Scientific Achievements and Research
  19. GS Paper | 05 | Elementary Maths: संख्या पद्धति / Number System, Divisibility Rules, महत्तम समापवर्तक और लघुत्तम समापवर्त्य / HCF and LCM, प्रतिशत / Percentage, लाभ, हानि और बट्टा / Profit, Loss and Discount, साधारण और चक्रवृद्धि ब्याज / Simple and Compound Interest, अनुपात और समानुपात / Ratio and Proportion, औसत / Average, समय और कार्य / Time and Work, समय, चाल और दूरी / Time, Speed and Distance, Algebra, घन क्षेत्रमिति / Solid Mensuration, आँकड़ा निर्वचन / Data Interpretation, Arithmetic, Statistics, Probability, Sequence and Series (Series), मिश्रण और एलिगेशन / Mixture and Alligation, Calculus, Trigonometry, Vectors, संख्या पद्धति और संख्या सिद्धांत / Number Systems and Number Theory, यूक्लिडीय ज्यामिति और क्षेत्रमिति / Euclidean Geometry and Mensuration, सांख्यिकी और प्रायिकता / Statistics and Probability, निर्देशांक ज्यामिति, सदिश और त्रिविमीय ज्यामिति / Coordinate Geometry, Vectors and 3D Geometry, बहुपद, समीकरण और सम्मिश्र संख्याएँ / Polynomials, Equations and Complex Numbers, समतल क्षेत्रमिति / Plane Mensuration, सरलीकरण, घातांक और करणी / Simplification, Indices and Surds, समुच्चय, संबंध, फलन और विविक्त गणित / Sets, Relations, Functions and Discrete Mathematics
  20. GS Paper | 06 | Indian Polity and Governance: Polity
  21. GS Paper | 07 | Current Events: समसामयिकी / Current Affairs
  22. UPLT Live Classes Notes: UPLT Live Classes
  23. UPLT Full Mock Tests Tier 1:
  24. UPLT Full Mock Tests Tier 2:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

The video lecture focuses on the implementation of a stack data structure using a linked list. The instructor presents a multiple-choice question asking to identify the correct statement regarding push and pop operations. He begins by defining the fundamental property of a stack: Last In First Out (LIFO). He illustrates this concept by drawing a vertical stack diagram and listing elements 10, 20, 30, and 40. He then transitions to explaining how this structure translates to a linked list, emphasizing that for efficient O(1) operations, both insertion (push) and deletion (pop) must occur at the same end of the list. He demonstrates the process of inserting nodes at the head of the linked list, showing how the head pointer updates with each new element. Finally, he analyzes the given options, explaining why inserting at one end and removing from the other describes a Queue (FIFO) rather than a Stack, leading to the conclusion that "None of the above" is the correct answer.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The instructor introduces the question about linked list stack implementation. He writes "LIFO" and "FIFO" on the board to distinguish between stack and queue properties. He draws a stack diagram and writes the numbers 10, 20, 30, 40 to represent elements. He starts drawing a linked list node structure, showing a data field and a next pointer. He explains the concept of inserting a node at the beginning of the list, drawing a node with data '10' and a pointer. He then shows how a new node '20' is inserted before '10', becoming the new head. This visual demonstration sets the stage for analyzing the time complexity of operations. He emphasizes that the head pointer changes with every insertion, ensuring the most recent element is always accessible.

  2. 2:00 – 4:30 02:00-04:30

    The instructor continues the linked list demonstration by adding nodes '30' and '40' to the head of the list. He writes "Push & Pop O(1)" to indicate the efficiency of operations at the head. He then evaluates Option (A), which suggests inserting at the beginning and removing from the end. He crosses this out, explaining that removing from the end is O(n) and violates the LIFO principle if the last inserted element is at the head. He evaluates Option (B), which suggests inserting at the end and removing from the beginning. He also crosses this out, noting that this describes a Queue (FIFO) behavior. He concludes that for a stack, push and pop must happen at the same end. He marks Option (D) "None of the above" as the correct answer, reinforcing that the options provided describe queue operations, not stack operations. He explicitly writes "Head -> 40 -> 30 -> 20 -> 10" to show the final state of the linked list after all insertions.

The lecture effectively bridges the gap between abstract data structure concepts and their concrete implementation. By visually constructing the linked list step-by-step, the instructor clarifies why specific operation sequences define a stack versus a queue. The key takeaway is that a stack requires push and pop operations to occur at the same end of the linked list to maintain the LIFO property and achieve O(1) time complexity. This distinction is crucial for understanding data structure selection in algorithm design.

Loading lesson…