Atos Interview Questions and Answers

Verbal, reasoning,aptitude

Q1. MCQs related to CS
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2Coding questions and it was moderate level

Q1. What is scd type 2?
Ans. 
SCD type 2 is a method used in data warehousing to track historical changes by creating a new record for each change.
• SCD type 2 stands for Slowly Changing Dimension type 2

• It involves creating a new record in the dimension table whenever there is a change in the data

• The old record is marked as inactive and the new record is marked as current

• It allows for historical tracking of changes in data over time

• Example: If a cust...read more
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Q2. Pyspark question read CSV from folder and add column in each csv file and write it to different location.
Ans. 
Read multiple CSV files, add a column, and save them to a new location using PySpark.
• Use SparkSession to initialize PySpark: `spark = SparkSession.builder.appName('CSVProcessor').getOrCreate()`.

• Read CSV files from a folder: `df = spark.read.csv('path/to/folder/*.csv', header=True)`.

• Add a new column: `df = df.withColumn('new_column', lit('value'))`.

• Write the modified DataFrame to a new location: `df.write.csv('path/to/o...read more
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Q1. What is the capital market?
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The capital market is a financial market where individuals and institutions trade financial securities.
• It is a market for buying and selling long-term debt or equity-backed securities.

• It includes stock exchanges and over-the-counter markets.

• Investors can buy and sell stocks, bonds, and other financial instruments in the capital market.

• It helps companies raise capital for expansion and growth.

• Examples include the New Yo...read more
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Q1. What is abstract class
Ans. 
An abstract class is a class that cannot be instantiated and is used as a blueprint for other classes to inherit from.
• Cannot be instantiated directly

• May contain abstract methods that must be implemented by subclasses

• Can have both abstract and non-abstract methods

• Used to define common behavior for subclasses
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Q2. How to implement singleton pattern
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Singleton pattern ensures a class has only one instance and provides a global point of access to it.
• Create a private static instance variable of the class itself

• Make the constructor private to prevent instantiation from outside the class

• Provide a static method to access the singleton instance
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Q1. Struts framework question
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Q2. Working flow of struts
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Struts is a framework for building Java web applications based on the Model-View-Controller (MVC) design pattern.
• Struts framework is based on MVC architecture

• It uses ActionServlet as the controller

• Struts configuration is done using XML files like struts-config.xml

• It provides built-in support for form validation and error handling

• Struts actions are mapped to URLs in struts-config.xml
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Q1. What about ur experience
Ans. 
I have extensive experience in field engineering, focusing on project management, technical support, and client relations.
• Managed multiple projects simultaneously, ensuring timely delivery and adherence to budget constraints.

• Provided technical support for equipment installation and troubleshooting, improving operational efficiency by 20%.

• Collaborated with cross-functional teams to develop innovative solutions for compl...read more
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Q2. Where did u work
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I have worked in various engineering roles, focusing on field operations, project management, and technical support across multiple industries.
• Worked as a Field Engineer at XYZ Corp, managing on-site installations and troubleshooting equipment.

• Collaborated with cross-functional teams to ensure project timelines were met, improving efficiency by 20%.

• Conducted regular site inspections to ensure compliance with safety reg...read more
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Q1. Oops concept related work
Ans. 
Object-Oriented Programming (OOP) concepts enhance software design through encapsulation, inheritance, polymorphism, and abstraction.
• Encapsulation: Bundling data and methods in a class. Example: A 'Car' class with properties like 'speed' and methods like 'accelerate()'.

• Inheritance: Deriving new classes from existing ones. Example: 'ElectricCar' inherits from 'Car', adding features like 'batteryCapacity'.

• Polymorphism: M...read more
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Q2. Technology used in prj
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Various technologies used in the project include Java, Spring Boot, Angular, MySQL, and Docker.
• Java

• Spring Boot

• Angular

• MySQL

• Docker
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