CapitalOne Research Analyst Interview Questions and Answers

Javascript,html, CSS and MySQL

Q1. Basic NodeJs and MySQL questions,scenario-based technical questions and basic interview questions
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Q2. What is an event loop, The second highest from the table
Ans. 
An event loop is a programming construct that waits for and dispatches events or messages in a program.
• Event loop is commonly used in asynchronous programming to handle tasks like I/O operations without blocking the main thread.

• It continuously checks for events in a queue and processes them one by one.

• Examples of event loops include Node.js event loop for handling asynchronous operations in JavaScript.

• Event loop helps ...read more
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Q1. Basic nodejs and SQL queries question
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Q1. Basic interview question and technology based
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Test was based on arrays and some dsa concepts.

Basic python, sql and pandas questions

Q1. Case study (Probability questions)
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Q2. Resume projects
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Q1. Does Java support pass by reference?
Ans. 
Yes
• Java uses pass by value for all variables, including object references.

• When an object reference is passed as an argument, a copy of the reference is passed, not the actual object.

• Modifying the reference inside the method will not affect the original reference outside the method.

• However, modifications to the object's state inside the method will be visible outside the method.
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Q2. Explain Singleton Pattern
Ans. 
Singleton pattern restricts the instantiation of a class to a single object.
• Singleton pattern ensures that only one instance of a class exists throughout the application.

• It provides a global point of access to the instance.

• Commonly used in scenarios where a single instance needs to coordinate actions across the system.

• Example: Database connection manager, logger, configuration manager.
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Q1. Internal Implementation of HashMap
Ans. 
HashMap is implemented using an array of linked lists to handle collisions.
• HashMap stores key-value pairs in an array of linked lists

• Hash function is used to determine the index of the array where the key-value pair will be stored

• Collision handling is done by chaining, where multiple key-value pairs with the same hash value are stored in the same linked list

• HashMap allows null keys and values

• HashMap is not synchronized...read more
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Sql, power Bi basic and Reporting knowledge

Sql knowledge , use of power bi

Salary discussion round

Coding and aptitude round

Q1. Tree dsa questions
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Q1. Horse race question
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Q1. Location specific question
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