Kanchi Karpooram Interview Questions and Answers

MCQ round on OOPS (java) , JS, C#, SQL(dbms)

Q1. Two DSA questions , Happy Number (leetcode Q.202) , First Unique character in String (leetcode Q.387)
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Q2. Polymorphism, Function Overloading & Overriding (code), Constructor, Access Specifier
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Q3. Project (about nextjs, diff. b/w next & react, advantage of nextjs, SPA, some discussion about tailwind, miui (library), js)
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Q4. DBMS query of second highest employee , find employeeid of manager whose employee name is 'something' (based on self join & only one table)
Ans. 
Use self join in a DBMS query to find the employeeid of the manager whose employee name is 'something'.
• Use a self join on the table to compare employee and manager names

• Order the results by employeeid in descending order to get the second highest employee

• Select the manager's employeeid where the employee name is 'something'
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Tricky questions from js, sql, c#

Q1. Uses of B Tree
Ans. 
B Trees are used for indexing in databases and file systems.
• Used for efficient searching, insertion, and deletion operations in databases.

• Helps in maintaining sorted data for quick retrieval.

• Commonly used in file systems to store large amounts of data efficiently.

• Each node in a B Tree can have multiple children, reducing the height of the tree.
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Q2. What is CTE in sql
Ans. 
CTE stands for Common Table Expression in SQL, used to create temporary result sets that can be referenced within a SELECT, INSERT, UPDATE, or DELETE statement.
• CTEs improve readability and maintainability of complex queries

• CTEs can be recursive, allowing for hierarchical data querying

• CTEs are defined using the WITH keyword followed by the CTE name and query
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Q1. Program to reverse a linked list
Ans. 
Reverse a linked list by changing the next pointers of each node to point to the previous node.
• Start with three pointers: current, prev, and next.

• Iterate through the linked list, updating the next pointers to point to the previous node.

• Update prev, current, and next pointers in each iteration until the end of the list is reached.
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Q2. Puzzles from geeksforgeeks
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Q1. General HR questions like difficulties, strength weakness etc.
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Q1. What is your current role?
Ans. 
I am currently working as a Business Analyst at a technology company.
• Analyzing business processes and requirements

• Creating reports and dashboards for stakeholders

• Collaborating with cross-functional teams to gather and analyze data
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Q2. About basic finance
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Q1. What is hedge fund?
Ans. 
A hedge fund is an investment fund that pools capital from accredited individuals or institutional investors and invests in a variety of assets.
• Hedge funds are typically only available to accredited investors due to their complex and risky nature.

• They often use leverage and derivatives to amplify returns.

• Hedge funds charge both a management fee and a performance fee based on the fund's profits.

• They can invest in a wide...read more
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Q2. What are derivatives ?
Ans. 
Derivatives are financial instruments whose value is derived from an underlying asset or group of assets.
• Derivatives can be used for hedging, speculation, or arbitrage.

• Common types of derivatives include options, futures, forwards, and swaps.

• Derivatives allow investors to take positions on the price movements of assets without owning the assets themselves.

• They are often used to manage risk in financial markets.

• Derivati...read more
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Q1. Why do you wan to change?
Ans. 
Seeking new challenges and opportunities for growth.
• Desire for professional growth and development

• Interest in exploring new industries or sectors

• Seeking a more collaborative work environment

• Opportunity to work on more impactful projects

• Desire for better work-life balance
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Q2. Salary discussion
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Q1. Can you tell me about yourself?
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Q2. What is the working principle and operational mechanism of a level transmitter?
Ans. 
A level transmitter measures the level of liquids or solids in a container using various principles like hydrostatic pressure or capacitance.
• Hydrostatic Pressure: Measures pressure at the bottom of a tank to determine liquid level.

• Capacitance: Uses changes in capacitance between probes to measure level.

• Ultrasonic: Sends ultrasonic waves to the surface and measures the time taken for the echo to return.

• Radar: Uses micro...read more
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Q3. What is the single line diagram of an electrical system?
Ans. 
A single line diagram (SLD) is a simplified representation of an electrical system showing components and their connections.
• Represents electrical components like transformers, circuit breakers, and loads in a single line.

• Used for system analysis, design, and troubleshooting.

• Example: A power distribution system showing the main feeder, sub-feeders, and loads.

• Helps in understanding the flow of electricity and identifying
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Q4. Give 2 reasons why we need to select you
Ans. 
I bring extensive experience and a proven track record of delivering innovative solutions that drive efficiency and success.
• Proven Expertise: I have over 10 years of experience in software development, leading projects that increased efficiency by 30%.

• Leadership Skills: I successfully managed a team of engineers on a project that delivered a product 2 months ahead of schedule.
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Q5. Why you changed more companies within short period
Ans. 
I changed companies to seek growth, new challenges, and align with my career goals in a rapidly evolving tech landscape.
• Pursued opportunities that offered better career advancement, such as a role at a startup that allowed me to lead projects.

• Transitioned to companies with innovative technologies that matched my interests, like moving to a firm specializing in AI.

• Some changes were due to company restructuring or layoff...read more
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Q1. What is arrow function in JS
Ans. 
Arrow functions are a concise way to write functions in JavaScript.
• Arrow functions have a shorter syntax compared to regular functions.

• They do not have their own 'this' keyword, and instead inherit 'this' from the parent scope.

• Arrow functions are best suited for non-method functions, and cannot be used as constructors.

• Example: const add = (a, b) => a + b;
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Q2. What is runtime polymerphism
Ans. 
Runtime polymorphism is the ability of a subclass to override a method from its superclass during runtime.
• Runtime polymorphism is achieved through method overriding in object-oriented programming.

• It allows a subclass to provide a specific implementation of a method that is already defined in its superclass.

• The actual method called is determined by the type of object at runtime.

• Example: Animal class has a method 'makeSo...read more
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Q3. What is abstraction in oops
Ans. 
Abstraction in OOP is the concept of hiding complex implementation details and showing only the necessary features to the outside world.
• Abstraction allows us to focus on what an object does rather than how it does it

• It helps in reducing complexity and improving maintainability of code

• Example: A car is an abstraction of various components like engine, wheels, etc. Users interact with the car without needing to know the
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DSA questions Reverse the linkedlist

Q1. Explain your project
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Q2. He asked two SQL queries
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Q1. Where you worked before sallary expectations and all
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