Practice Questions - Part 1

Duration: 44 min

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Inside: a video lesson and guided study material.

Module outline

  1. About the course: About the Course
  2. Mathematical Aptitude: संख्या पद्धति / Number System, महत्तम समापवर्तक और लघुत्तम समापवर्त्य / HCF and LCM, Divisibility Rules, प्रतिशत / Percentage, अनुपात और समानुपात / Ratio and Proportion, औसत / Average, लाभ, हानि और बट्टा / Profit, Loss and Discount, समय और कार्य / Time and Work, घन क्षेत्रमिति / Solid Mensuration, साधारण और चक्रवृद्धि ब्याज / Simple and Compound Interest, समय, चाल और दूरी / Time, Speed and Distance, Age Problems, मिश्रण और एलिगेशन / Mixture and Alligation, Algebra, सरलीकरण, घातांक और करणी / Simplification, Indices and Surds, Pipe and Cistern, Trigonometry, Statistics, आँकड़ा निर्वचन / Data Interpretation, Arithmetic, समुच्चय, संबंध, फलन और विविक्त गणित / Sets, Relations, Functions and Discrete Mathematics, संख्या पद्धति और संख्या सिद्धांत / Number Systems and Number Theory, निर्देशांक ज्यामिति, सदिश और त्रिविमीय ज्यामिति / Coordinate Geometry, Vectors and 3D Geometry, बहुपद, समीकरण और सम्मिश्र संख्याएँ / Polynomials, Equations and Complex Numbers
  3. Logical Reasoning: श्रेणी / Series, कूट लेखन एवं कूट वाचन / Coding-Decoding, सादृश्यता एवं वर्गीकरण / Analogy and Classification, रक्त संबंध / Blood Relations, दिशा एवं दूरी / Direction and Distance, क्रम एवं रैंकिंग / Order and Ranking, अशाब्दिक तर्क / Non-Verbal Reasoning, बैठक व्यवस्था एवं पहेलियाँ / Seating Arrangement and Puzzles, Syllogisms, वेन आरेख, न्याय वाक्य एवं असमानता / Venn Diagrams, Syllogism and Inequalities, गणितीय संक्रियाएँ एवं लुप्त संख्या / Mathematical Operations and Missing Numbers, वर्णमाला एवं संख्या परीक्षण / Alphabet and Number Test, कथन आधारित तार्किक विवेचन / Statement-Based Reasoning, Analytical Reasoning (Counting Figures Reasoning), घन, पासा एवं आकृतियों की गिनती / Cubes, Dice and Figure Counting, कैलेंडर एवं घड़ी / Calendar and Clock, Clock
  4. General Knowledge: वैज्ञानिक उपलब्धियाँ और अनुसंधान / Scientific Achievements and Research, Chemistry, Biology, History, Geography, Polity, Indian Economy, समसामयिकी / Current Affairs, Static General Knowledge, राज्य विशेष सामान्य ज्ञान / State-Specific General Knowledge
  5. Art of Teaching: शिक्षण-अधिगम प्रक्रिया एवं कक्षा प्रबंधन / Teaching-Learning Process and Classroom Management, Learners & Learning Process, Factors Affecting Teaching, शिक्षण विधियाँ एवं उपागम / Teaching Methods and Approaches, सूक्ष्म शिक्षण एवं कक्षा संप्रेषण / Microteaching and Classroom Communication, शिक्षण सहायक सामग्री एवं शैक्षिक तकनीकी / Teaching Aids and Educational Technology, आकलन एवं मूल्यांकन / Assessment and Evaluation, शिक्षक: गुण, व्यावसायिक नैतिकता एवं विकास / Teacher: Qualities, Professional Ethics and Development, शैक्षिक नीतियाँ, अधिनियम एवं प्रशासन / Educational Policies, Acts and Administration, पाठ्यचर्या, कला एवं सह-शैक्षिक क्षेत्र / Curriculum, Arts and Co-curricular Areas, निर्देशन एवं परामर्श / Guidance and Counselling, दिव्यांग बच्चों की शिक्षा / Education of Children with Disabilities, Micro-Teaching & Teaching Skills, पाठ योजना / Lesson Planning
  6. Environmental Science: Environment
  7. Unit 1 | Digital Electronics: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits, Number System, Number Representation
  8. Unit 2 | COA: 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
  9. Unit 3 | C Programming: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling
  10. Unit 3 | Data Structures: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  11. Unit 4 | Algorithms: Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Dynamic Programming, Minimum Spanning Trees, Shortest Path Algos, Advanced Algorithms
  12. Unit 5 | Operating System: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Threads & Process Creation, Deadlock, Memory Management, Virtual Memory, Disc Scheduling, File Management
  13. Unit 6 | Database Management System: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, SQL, Transaction Management, Concurrency Control
  14. Unit 7 | 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
  15. Unit 8 | Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  16. Unit 9 | Object Oriented Programming: OOPS with C++
  17. Unit 10 | Web Development: HTML Basics, CSS, JavaScript-Basics, XML, Node.js, Git & Github, PHP
  18. Unit 11 | 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
  19. Unit 12 | IoT: Emerging Tech Trends, Cloud Computing, कंप्यूटर नेटवर्क / Computer Networks
  20. Unit 13 | Artificial Intelligence: Approaches to AI, Search Algorithms, Game Playing, Knowledge Representation, Natural Language Processing, Artificial Neural Networks, Genetic Algorithms
  21. Unit 14 | E-Commerce: Electronic Data Interchange and E-Commerce, Role of Internet and Web Services, Security in Mobile and Wireless Computing, Physical Security and Cryptography Basics, Cyber Safety and Security
  22. Unit 15 | Multimedia: Multimedia
  23. Unit 16 | Python: Introduction to Python, Tokens, Variables, Data Types, I/O, Operators & Expressions, Control Flow & Looping, Collections & Strings, Functions & Modules, File Handling & Data Analysis, DSA using Python
  24. Full Length Mock Tests — General Paper:
  25. Full Length Mock Tests — Computer Science (Paper II):
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This educational video presents a series of geometry problems, focusing on the properties of squares, polygons, and triangles. The lecture begins with a problem involving a square ABCD, where a new square EFGH is formed by joining the midpoints of its sides, and this process is repeated to form smaller squares KLMN and PQRS. The instructor analyzes the relationship between the side lengths and areas of these nested squares, demonstrating that the area of each subsequent square is half of the previous one, leading to a ratio of 1:8 for the areas of KLMN and ABCD. The video then transitions to a problem about a sequence of squares constructed from a 10 cm line segment, where each new square uses the diagonal of the previous one as its side. The instructor derives a geometric progression for the side lengths, showing that the length of the nth square is 10 / (√2)^n, and solves for the smallest n where this length is less than 1/100. The final segment covers polygon angle sums, using the formula (n-2) × 180° for a regular n-gon, and applies it to a decagon. It also addresses triangle inequality, determining the possible integer values for the third side of a triangle with sides 12 cm and 7 cm, and calculating the sum of all such values. The video concludes with a problem on obtuse-angled triangles, using the Pythagorean theorem to find the range of the third side and counting the number of integer solutions.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video opens with a title card for 'GEOMETRY & MENSURATION'. It then presents a problem on a blackboard: 'In the given figure, EFGH is formed by joining midpoints of consecutive sides of square ABCD. Figures PQRS and KLMN are also formed similarly. The ratio of areas of KLMN and ABCD is __'. The instructor, Yash Jain Sir, begins to explain the problem, referencing the diagram which shows a large square ABCD with smaller squares EFGH, PQRS, and KLMN nested inside, each rotated 45 degrees relative to the previous one. The on-screen text clearly states the question and the multiple-choice options (A) 1:4, (B) 1:8, (C) 1:16, (D) 1:4√2.

  2. 2:00 – 5:00 02:00-05:00

    The instructor begins to solve the first problem. He draws a square and explains that joining the midpoints of a square's sides creates a new, smaller square. He uses the Pythagorean theorem to find the side length of the new square. If the original side is 'a', the new side is √((a/2)² + (a/2)²) = √(a²/2) = a/√2. He then calculates the area of the new square as (a/√2)² = a²/2, which is half the area of the original square. He applies this logic to the next iteration, showing that the area of PQRS is half of EFGH, and the area of KLMN is half of PQRS. He concludes that the area of KLMN is 1/8 of the area of ABCD, making the ratio 1:8.

  3. 5:00 – 10:00 05:00-10:00

    The instructor continues to explain the area ratio. He writes the formula for the area of a square, A = s², and shows the progression of side lengths: s, s/√2, s/(√2)², s/(√2)³. He then calculates the area of the third square (KLMN) as (s/(√2)³)² = s²/(√2)⁶ = s²/8. He confirms that the ratio of the area of KLMN to ABCD is 1/8, which corresponds to option (B). He then transitions to the next problem, which involves a line segment of 10 cm.

  4. 10:00 – 15:00 10:00-15:00

    The video presents a new problem: 'A line 10 cm long is drawn. A square is constructed with this line segment as diagonal. Then a second square is drawn with a side of the first square as diagonal. This process is repeated 'n' times, until the length of the nth square is less than 1/100. What is the least value of 'n'?'. The instructor draws a square with a diagonal of 10 cm. He uses the Pythagorean theorem to find the side length of the first square: a² + a² = 10², so 2a² = 100, a² = 50, a = √50 = 5√2. He then draws a second square with this side as its diagonal, and so on, illustrating the geometric progression.

  5. 15:00 – 20:00 15:00-20:00

    The instructor derives the general formula for the side length of the nth square. He shows that the side length of the first square is 10/√2. The side length of the second square is (10/√2)/√2 = 10/(√2)². He establishes the pattern: the side length of the nth square is 10/(√2)^n. He sets up the inequality 10/(√2)^n < 1/100 and solves for n. He multiplies both sides by 100(√2)^n to get 1000 < (√2)^n. He then takes the logarithm of both sides to find n > log(1000)/log(√2) = 3/log(√2) = 3/(0.5*log(2)) = 6/log(2). He calculates that log(2) is approximately 0.3010, so n > 6/0.3010 ≈ 19.93. Therefore, the least integer value of n is 20.

  6. 20:00 – 25:00 20:00-25:00

    The video moves to a new problem: 'In a regular decagon, what is the sum of all interior angles?'. The instructor writes the formula for the sum of interior angles of a polygon: (n-2) × 180°. He identifies that a decagon has n=10 sides. He substitutes the value into the formula: (10-2) × 180° = 8 × 180° = 1440°. He then presents a related problem: 'A regular polygon with 'n' sides has interior angle measuring 178°. What is the value of 180/n?'. He writes the formula for the interior angle of a regular polygon: ((n-2) × 180°)/n = 178°. He solves the equation: 180n - 360 = 178n, which gives 2n = 360, so n = 180. Therefore, 180/n = 180/180 = 1.

  7. 25:00 – 30:00 25:00-30:00

    The next problem is: 'The two sides of a triangle are 12 cm and 7 cm. If the third side is an integer, find the sum of all the values of the third side?'. The instructor draws a triangle and applies the triangle inequality theorem. He writes the two inequalities: 12 + 7 > c (so c < 19) and |12 - 7| < c (so c > 5). Therefore, the third side c must be an integer such that 5 < c < 19. The possible integer values are 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18. He then calculates the sum of these values: 6+7+8+...+18. He uses the formula for the sum of an arithmetic series: (number of terms)/2 × (first term + last term). The number of terms is 18-6+1=13. The sum is 13/2 × (6+18) = 13/2 × 24 = 13 × 12 = 156.

  8. 30:00 – 35:00 30:00-35:00

    The video presents a problem on obtuse-angled triangles: 'Consider obtuse angled triangles with sides 8 cm, 15 cm and x cm. If x is an integer, then how many such triangles exist?'. The instructor first applies the triangle inequality: 8+15 > x (x < 23) and |15-8| < x (x > 7). So, 7 < x < 23. For the triangle to be obtuse, the square of the longest side must be greater than the sum of the squares of the other two sides. He considers two cases: if x is the longest side, then x² > 8² + 15² = 64 + 225 = 289, so x > √289 = 17. If 15 is the longest side, then 15² > 8² + x², so 225 > 64 + x², which gives x² < 161, so x < √161 ≈ 12.68. Therefore, x < 13.

  9. 35:00 – 40:00 35:00-40:00

    The instructor combines the conditions for the obtuse triangle. From the triangle inequality, 7 < x < 23. From the obtuse condition, either x > 17 or x < 13. He considers the two cases. Case 1: x > 17 and 7 < x < 23, so 17 < x < 23. The integer values are 18, 19, 20, 21, 22. Case 2: x < 13 and 7 < x < 23, so 7 < x < 13. The integer values are 8, 9, 10, 11, 12. He adds the number of values from both cases: 5 + 5 = 10. Therefore, there are 10 such triangles.

  10. 40:00 – 43:30 40:00-43:30

    The video concludes with a final 'THANKS FOR WATCHING' screen. The instructor has completed all the problems, which covered the properties of squares, the sum of interior angles of polygons, the triangle inequality, and the conditions for a triangle to be obtuse. The key concepts demonstrated were the use of geometric formulas, algebraic manipulation, and logical reasoning to solve problems involving geometric figures.

The video is a comprehensive lecture on geometry, systematically progressing through a series of problems that reinforce fundamental concepts. It begins with the properties of nested squares, demonstrating a geometric sequence in side lengths and areas, which is a powerful application of the Pythagorean theorem. The lesson then transitions to a problem involving a geometric progression of square side lengths, requiring the use of logarithms to solve for the number of iterations. This is followed by a review of the formula for the sum of interior angles of a polygon, applied to a decagon and a general regular polygon. The final segment focuses on triangle properties, using the triangle inequality to find possible side lengths and the Pythagorean theorem to determine the conditions for a triangle to be obtuse. The synthesis of these topics shows a clear pedagogical structure, moving from basic shapes to more complex applications of geometric principles, all grounded in algebraic problem-solving.

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