Important Practice Questions & Short Tricks

Duration: 6 min

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Inside: a video lesson and guided study material.

Module outline

  1. Quantitative Aptitude: Number System, Percentage, Profit and Loss, Ratio and Proportion (Ratios), Average, Time and Work, Speed Time and Distance, Simple Interest and Compound Interest, Mixture and Alligation, Data Interpretation, Permutation and Combination, Probability, Logarithm, Powers and Exponents (Surds and Indices), Age Problems, Divisibility Rules, Partnership, HCF LCM, Algebra, Pipe and Cistern
  2. Logical Reasoning: Series (Number and Letter Series) (Numerical Relations and Reasoning), Analogy, Coding Decoding, Blood Relations, Directions (Direction Test), Syllogisms, Logical Sequence Of Words, Data Sufficiency, Seating Arrangements, Puzzle Solving (Puzzles), Calendar, Clock, Cubes & Dices, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Data Arrangement
  3. English Language: Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Sentence Correction (Error Correction), Sentence Completion (Fill in the blanks), Vocabulary, Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Active Passive Voice (Voice), Direct and Indirect Speech, Cloze Test (Cloze Passage), Tenses, Subject Verb Agreement (Verb Noun Agreement), Preposition, Articles, Conjunction, Adverb
  4. Written English Test: English Writing Ability
  5. Coding: Coding Questions by Yash Sir, C Programming by Yash Sir, Programming in C++, Java, Python for Placements by Yash Sir
  6. Communication Round: Communication Assessment
  7. DBMS (Technical Interview): Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, Relational Calculus, Transaction Management, Concurrency Control, Database Recovery, ORDBMS, Database Security & Authorization, Query Processing & Optimization, Enhanced Data Models, Big Data Systems, NoSQL, Data Warehousing & Mining
  8. SQL (Technical Interview): SQL
  9. Operating Systems (Technical Interview): Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Deadlock, Threads & Process Creation, Memory Management, Virtual Memory, Disc Scheduling, File Management, Windows OS, Linux OS, Security, Distributed Systems, Virtual Machines
  10. Computer Networks (Technical Interview): 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 Security, Mobile Technology, Cloud Computing and IoT, Cyber and Info Security
  11. OOPs (Technical Interview): Object Oriented Programming (OOPS)
  12. HR Interview: MR & HR Interview Preparation
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

The video is a lecture on solving logical reasoning problems related to calendars, presented by an instructor from Knowledge Gate. The first problem, asked in a TCS interview, is a riddle about age: 'The day before yesterday, I was 25 years old, and next year I will turn 28.' The instructor explains that this is possible if the person's birthday is on December 31st and the current date is January 1st of a new year. On December 30th of the previous year, the person was 25. On December 31st, they turned 26. On January 1st of the current year, they are still 26, but they will turn 27 in the current year and 28 in the following year. The second problem asks for the maximum gap between two successive leap years, which is 8 years, as demonstrated by the sequence 1896, 1904, 1908, 1912, 1920, etc. The final problem asks how many weekends are in a year, with the instructor calculating that a year has 52 weeks and 1 or 2 extra days, leading to 52 or 53 weekends, with 53 being the maximum possible. The video uses a digital blackboard for calculations and includes on-screen text for the questions and options.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video opens with a title card for a 'CALENDAR' topic, followed by a lecture screen. The instructor, Yash Jain, introduces a logical puzzle: 'The day before yesterday, I was 25 years old, and next year I will turn 28. How is it possible?' The question is displayed on a green bar at the top. The instructor begins to analyze the problem, setting up the context of a TCS interview question from 2019. The background is a black digital board with white chalk-style drawings of school supplies. The instructor is visible in a small window in the bottom right corner.

  2. 2:00 – 5:00 02:00-05:00

    The instructor begins to solve the age riddle on the digital blackboard. He writes 'DOB: 31st December' and then uses a timeline to explain the logic. He writes '31st December 2007 -> 25' and '30th December 2008 -> 26', showing that the person was 25 on December 30, 2007. He then writes '1st Jan 2008 -> 26' and '31st Dec 2009 -> 28', explaining that on January 1, 2008, the person is 26, and they will turn 27 in 2008 and 28 in 2009. The key insight is that the 'day before yesterday' was December 30, 2007, and 'next year' refers to 2009, when they will turn 28. The instructor uses arrows and dates to clearly illustrate the timeline.

  3. 5:00 – 6:27 05:00-06:27

    The video transitions to a new problem: 'The maximum gap between two successive leap year is?'. The options are a) 4, b) 8, c) 2, d) 1. The instructor explains that a leap year occurs every 4 years, but century years are not leap years unless divisible by 400. He provides the example of 1896 and 1904, showing a gap of 8 years. He then moves to the next problem: 'How many weekends are there in a year?'. He explains that a year has 365 days, which is 52 weeks and 1 day, or 52 weeks and 2 days in a leap year. Since a weekend consists of 2 days (Saturday and Sunday), there are at least 52 weekends. In a non-leap year, the extra day could be a Saturday or Sunday, making it 53 weekends. In a leap year, the two extra days could be a Saturday and Sunday, also making it 53 weekends. The maximum is 53. The video ends with a 'THANKS FOR WATCHING' screen.

The video presents a structured lesson on calendar-based logical reasoning, progressing from a complex riddle to two more direct calculation problems. The core teaching method involves breaking down each problem into a clear, step-by-step logical process, often using a timeline or a digital blackboard to visualize the sequence of events. The first problem highlights the importance of carefully interpreting the temporal context of a statement, particularly the ambiguity of 'next year'. The second problem demonstrates the application of the rules for leap years, showing that the maximum gap is 8 years due to the century rule. The final problem applies basic division and understanding of the week cycle to determine the maximum number of weekends in a year. The synthesis of these problems is the application of logical deduction and fundamental calendar rules to solve seemingly paradoxical or quantitative questions.

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