Practice Questions

Duration: 8 min

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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 educational video presents a step-by-step solution to two quantitative aptitude problems related to profit and loss, using a digital whiteboard. The first problem, from an Accenture exam, involves calculating the percentage profit or loss for a pen dealer who buys 9 pens for 16 rupees and sells them at an offer of 11 pens for 20 rupees. The instructor demonstrates a method to find the cost price (CP) and selling price (SP) per pen by equating the total cost and revenue for a common number of pens (180), leading to a calculated profit of 25/11%, or approximately 2.27%. The second problem, from a GATE exam, asks for the loss incurred by a fruit seller who sold a basket at a 12.5% loss, and if he had sold it for Rs. 108 more, he would have made a 10% gain. The instructor uses the ratio method, setting the cost price (CP) as 100 units, which results in a selling price (SP) of 87.5 units for a 12.5% loss and 110 units for a 10% gain. The difference of 22.5 units is equated to Rs. 108, allowing the calculation of the CP as Rs. 480 and the loss as Rs. 60. The video concludes with a 'Thanks for Watching' screen.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video opens with a title card for a question from an Accenture exam. The problem states: 'Sunny deal purchases 9 pens in 16 rupees and sell it at a offer of 11 pens for 20 rupees. How much percentage profit or loss he received?'. The instructor begins the solution by writing 'Qty' and 'Rs.' on a digital whiteboard, then sets up the purchase and sale data: 9 pens for 16 rupees and 11 pens for 20 rupees. He explains that to compare the cost and selling price, a common number of pens must be used. He calculates the least common multiple of 9 and 11, which is 99, but then uses 180 (a multiple of 9 and 11) to make the calculations easier. He writes '20*9=180' and '11*16=176', indicating that the cost for 180 pens is 180 rupees and the selling price for 180 pens is 176 rupees. He then writes the formula for profit percentage: 'Profit = (SP - CP) / CP * 100'. He also notes that the cost price for 180 pens is 180 rupees and the selling price is 176 rupees, which implies a loss of 4 rupees on 180 rupees. He then begins to write the formula for percentage loss: '180 - 176 / 176 * 100'.

  2. 2:00 – 5:00 02:00-05:00

    The instructor continues solving the first problem. He writes the formula for percentage loss as '(180 - 176) / 176 * 100', which simplifies to '4 / 176 * 100'. He then simplifies the fraction '4/176' to '1/44'. He writes '1/44 * 100' and calculates the result as '100 / 44', which simplifies to '25 / 11'. He states that the percentage loss is 25/11%, which is approximately 2.27%. He then moves to the second problem, which is from a GATE exam. The problem states: 'A fruit seller sold a basket of fruits at 12.5% loss. Had he sold it for Rs. 108 more, he would have made a 10% gain. What is the loss in Rupees incurred by the fruit seller?'. He introduces the 'Ratio Method' as a shortcut. He writes 'CP = 100' and 'L = 12.5%'. He explains that a 12.5% loss means the selling price (SP) is 87.5% of the cost price. He writes 'SP = 87.5'. He then writes 'G = 10%' and 'SP = 110'. He explains that the difference between the two selling prices is 110 - 87.5 = 22.5. He equates this difference to Rs. 108. He writes '22.5 = 108' and '100 = ?'. He calculates the cost price (CP) as (108 / 22.5) * 100 = 480. He then calculates the loss as 12.5% of 480, which is 60. He concludes that the loss incurred by the fruit seller is Rs. 60.

  3. 5:00 – 8:18 05:00-08:18

    The instructor continues to solve the second problem using the 'Percentage Method'. He writes 'CP = 100' and 'L = 12.5%'. He explains that a 12.5% loss means the selling price (SP) is 87.5% of the cost price. He writes 'SP = 87.5'. He then writes 'G = 10%' and 'SP = 110'. He explains that the difference between the two selling prices is 110 - 87.5 = 22.5. He equates this difference to Rs. 108. He writes '22.5 = 108' and '100 = ?'. He calculates the cost price (CP) as (108 / 22.5) * 100 = 480. He then calculates the loss as 12.5% of 480, which is 60. He concludes that the loss incurred by the fruit seller is Rs. 60. The video ends with a 'Thanks for Watching' screen.

The video provides a clear, structured walkthrough of two profit and loss problems, emphasizing different solution methods. The first problem is solved by finding a common quantity to compare cost and selling prices, leading to a calculation of percentage loss. The second problem is solved using the ratio method, where the cost price is assumed as 100 units, and the difference in selling prices is used to find the actual cost and the loss. The instructor effectively uses a digital whiteboard to show all calculations step-by-step, making the concepts accessible for students preparing for competitive exams.

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