Type 4 Important Practice Questions

Duration: 14 min

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Inside: a video lesson and guided study material.

Module outline

  1. About the Course: About the Course
  2. Paper-1 & 2 | Basic Numeracy: Ratio and Proportion (Ratios), Divisibility Rules, Mixture and Alligation, Permutation and Combination, Logarithm, Number System, HCF LCM, Sequence and Series (Series), Speed Time and Distance, Percentage, Average, Mensuration and Geometry, Age Problems, Arithmetic, Statistics, Probability, Profit and Loss, Simple Interest and Compound Interest, Partnership, Speed Mathematics and Basic Mathematics, Algebra, Powers and Exponents (Surds and Indices), Time and Work, Pipe and Cistern, RSSB Specific Videos - Basic Numeracy
  3. Paper-1 & 2 | Data Interpretation: Data Interpretation
  4. Paper-1 & 2 | General Mental Ability: Mental Ability, RSSB Specific Videos - Mental Ability
  5. Paper-1 & 2 | Logical Reasoning and Analytical Ability: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Data Sufficiency, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Syllogisms, Seating Arrangements, Blood Relations, Directions (Direction Test), Analytical Reasoning (Counting Figures Reasoning), Puzzle Solving (Puzzles), Calendar, Clock, Cubes & Dices, Venn Diagram, Analogy, Ranking, Order and Sequence, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Data Arrangement, Logical Sequence Of Words, Crypt Arithmetic
  6. Paper-1 & 2 | Decision Making and Problem Solving: Selection Decision Table (Decision Making)
  7. Paper-1 | General Science: Physics, Biology, Chemistry, RSSB Specific Videos
  8. Paper-1 | General Awareness: State Wise GK, GK- Current Affairs
  9. Paper - 2 | Digital Logic Systems: Digital Systems & Boolean Basics, Logic Gates & Hardware, Combinational Circuit, Sequential Circuits
  10. Paper-2 | Database Management System: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, Relational Calculus, Relational Algebra, SQL, NoSQL
  11. Paper-2 | Data Structures & Algorithms: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Algorithm Analysis, Sorting Algorithms, Intro to Compilers, Hashing
  12. Paper 2 | Data Communication and Network Security: Introduction to CN, Data Communication, Data Link Layer - Ethernet, DLL: Error Control, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Application Layer, Hardware basics, Network Security, Ethical Hacking
  13. Paper-2 | Operating Systems: Introduction to OS, Process Management, Memory Management, File Management, Deadlock
  14. Paper-2 | Computer Organization and Architecture: Basics of COA, Floating Point Rep, Cache Memory Organization, Input Output Organisation, Instr Formats & Modes, Control Unit Design, Register Transfer and Microoperations, Programming the Basic Computer, Number System, Number Representation
  15. Paper 2 | System Analysis and Design: Fundamentals of Systems and Information Systems, Fundamentals of Software Engineering, SDLC and Development Approaches, Software Documentation and Software Requirements Specification (SRS), SDD and Quality Assurance, Security, Risk Management & Maintenance, Software Testing
  16. Paper-2 | C Programming: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling
  17. Paper 2 | OOPS , C++ , JAVA: Language Design, OOPS with C++, Java, .Net Programming, Java Fundamentals
  18. Paper 2 | Python: Introduction to Python, Tokens, Variables, Data Types, I/O, Operators & Expressions, Control Flow & Looping, Collections & Strings, Functions & Modules, File Handling & Data Analysis
  19. Emerging Trends and AI: Emerging Tech Trends, Artificial Intelligence
  20. Paper-2 | Data Processing (Ms-Office): MS Office Applications
  21. Paper-2 | Internet and Web Technologies: HTML Basics, CSS, XML, JavaScript-Basics, Internet Fundamentals, Protocols & Services, Web Publishing & Hosting, Server Side & Security, Emerging Technologies, Terms & Abbreviations, Cyber Threats and Malware Attacks, Role of Internet and Web Services, Security in Mobile and Wireless Computing
  22. Paper 2 | Pedagogy: Child Development, Theories, Concept of Pedagogy, Inclusive Education, Experiential Pedagogy, Assessment & Evaluation, Psychology, Curriculum Framework & Reforms, National Education Policy (NEP) 2020
  23. Live Classes: RSSB Live Sessions
  24. Paper 1 - Full Mock Tests:
  25. Paper 2 - Full Mock Tests:
  26. BCI Previous Year Papers:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This educational video is a comprehensive lecture on solving coding-decoding problems, a common topic in competitive exams. The instructor, Yash Jain, systematically explains various types of coding-decoding puzzles. The video begins with a demonstration of a substitution cipher using the ROT13 algorithm, where letters are shifted by 13 positions in the alphabet, illustrated with the example 'HOLA' becoming 'UBYN'. It then transitions to a series of multiple-choice questions. The first question involves a code language where 'mok dan sil' means 'nice big house', 'fit kon dan' means 'house is good', and 'warm tir fit' means 'cost is high', asking for the word for 'good'. The instructor analyzes the common words to deduce that 'kon' is the code for 'good'. The second question uses the phrases 'nitco sco tingo' for 'softer than flower', 'tingo rho mst' for 'sweet flower fragrance', and 'mst sco tmp' for 'sweet than smile', to determine the code for 'fragrance', concluding it is 'tingo'. The third question presents 'Tom Kun Sud' for 'Dogs are barking', 'Kun Jo Mop' for 'Dogs and Horses', and 'Mut Tom Ko' for 'Donkeys are mad', to find the code for 'barking', which is 'Sud'. The final question is a data sufficiency problem asking what 'orange' represents, providing three statements: 'rim pa xab' means 'orange and apple', 'na pie tac' means 'I dislike sweet', and 'na tsi pa' means 'orange is sweet'. The instructor explains that statements 1 and 3 are sufficient to determine that 'pa' represents 'orange'. The video concludes with a 'Thanks for Watching' screen.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video opens with a slide titled 'CODING DECODING' that presents a problem: 'MONKEY KMLICW then ORANGE ?'. It shows the word 'MONKEY' being converted to 'KMLICW' by subtracting 2 from each letter's position in the alphabet (e.g., M=13, 13-2=11=K). The slide then applies the same logic to 'ORANGE', showing that each letter should be decreased by 2 to get the code. The instructor, Yash Jain, is visible in a small window in the bottom right corner. The slide also features a paper airplane graphic and a blue background with a red speech bubble containing the title.

  2. 2:00 – 5:00 02:00-05:00

    This segment introduces the concept of a 'ROT13' cipher. A diagram shows the alphabet split into two rows, with arrows indicating that each letter is shifted by 13 positions. For example, 'A' maps to 'N', 'B' to 'O', and so on. The instructor demonstrates this with the word 'HOLA', which becomes 'UBYN' after applying the ROT13 shift. The slide includes the text 'YASH JAIN SIR' and 'KNOWLEDGE GATE EDUCATOR' at the bottom. The instructor is seen in a small window, explaining the concept.

  3. 5:00 – 10:00 05:00-10:00

    The video presents a series of multiple-choice questions. The first question asks for the code for 'good' given that 'mok dan sil' means 'nice big house', 'fit kon dan' means 'house is good', and 'warm tir fit' means 'cost is high'. The instructor analyzes the common words: 'dan' appears in both 'nice big house' and 'house is good', so 'dan' must mean 'house'. 'fit' appears in 'house is good' and 'cost is high', so 'fit' must mean 'is'. Therefore, 'kon' is the only word left for 'good'. The second question asks for the code for 'fragrance' given 'nitco sco tingo' for 'softer than flower', 'tingo rho mst' for 'sweet flower fragrance', and 'mst sco tmp' for 'sweet than smile'. The instructor identifies 'tingo' as the common word in 'softer than flower' and 'sweet flower fragrance', so 'tingo' must mean 'flower'. 'mst' is common in 'sweet flower fragrance' and 'sweet than smile', so 'mst' means 'sweet'. Therefore, 'rho' is the only word left for 'fragrance'.

  4. 10:00 – 14:21 10:00-14:21

    The third question asks for the code for 'barking' given 'Tom Kun Sud' for 'Dogs are barking', 'Kun Jo Mop' for 'Dogs and Horses', and 'Mut Tom Ko' for 'Donkeys are mad'. The instructor identifies 'Tom' as common in 'Dogs are barking' and 'Donkeys are mad', so 'Tom' means 'are'. 'Kun' is common in 'Dogs are barking' and 'Dogs and Horses', so 'Kun' means 'Dogs'. Therefore, 'Sud' is the only word left for 'barking'. The final question is a data sufficiency problem: 'What does 'orange' represent in a coded language?' with three statements. Statement 1: 'rim pa xab' means 'orange and apple'. Statement 2: 'na pie tac' means 'I dislike sweet'. Statement 3: 'na tsi pa' means 'orange is sweet'. The instructor explains that statement 1 gives 'orange and apple', and statement 3 gives 'orange is sweet'. The word 'pa' is common in both, so 'pa' must mean 'orange'. Therefore, statements 1 and 3 are sufficient. The video ends with a 'Thanks for Watching' screen.

The video provides a structured and methodical approach to solving coding-decoding problems. It begins with a fundamental concept, the ROT13 cipher, to establish the basic idea of substitution. It then progresses to more complex, real-world style problems that require logical deduction. The core method demonstrated is identifying common words or phrases across different coded sentences to isolate the meaning of individual code words. This is applied to three distinct types of problems: finding a single word's code, finding a word's code from a set of phrases, and a data sufficiency question. The instructor consistently uses a step-by-step analysis, breaking down each problem to its core components, which is a valuable technique for students preparing for competitive exams.

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