Excellis IT Interview Questions and Answers

Q1. What is the concept of a session in PHP?
Ans. 
A session in PHP is a way to store information (variables) to be used across multiple pages.
• Sessions are used to store user data on the server for later use

• Sessions are identified by a unique session ID, usually stored in a cookie

• Session data is stored on the server side, making it more secure than using cookies alone
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Q2. What is the difference between variables and constants in PHP?
Ans. 
Variables can be changed during the execution of a script, while constants cannot be changed once they are defined.
• Variables can be reassigned with new values, while constants cannot be changed once defined

• Constants are defined using the define() function, while variables are assigned using the $ symbol

• Constants are case-sensitive by default, while variables are case-insensitive
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Q3. What will be the output of the code below and why?
Ans. 
The code will output 'Hello World!' because the variable $x is set to true.
• The code will check if $x is true, which it is, so it will output 'Hello World!'

• The if statement will only execute if the condition is true, in this case $x is true.
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What are the differences between echo and print in PHP?

Q1. Questions were based QMS & ISMS and past experience
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Q1. Discussed about past experience
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Q1. Coding questions to be solved online
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Q2. Python theoritical questions
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Q1. Projects worked on my current organization
Ans. 
Developed web applications for data visualization and analysis
• Created interactive dashboards using Plotly and Dash

• Implemented data processing pipelines with Pandas and NumPy

• Utilized Flask for backend development

• Collaborated with data scientists to integrate machine learning models
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Q2. Database and AWS infra
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It includes questions from aptitude as well as coding related questions, JAVA was the most common language in which majority of the coding questions were

Q1. Questions related to the skills mentioned under Resume
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Q2. One DSA question is must, like Pallyndrome
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Q1. Questions regarding your project
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Q2. Questions regarding your internship experience and if any difficulties faced during internship
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Easy you will have enough time to solve the questions

Q1. Tell me about yourself
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Q2. Why you want to join our company
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Q1. Scenario of microservice saga pattern
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Q2. Given an integer array segregate odd and even numbers without using another array
Ans. 
Segregate odd and even numbers in an integer array without using another array
• Iterate through the array and maintain two pointers, one for odd numbers and one for even numbers

• Swap elements at the odd and even pointers until all odd numbers are on one side and even numbers on the other

• Example: Input array [3, 6, 8, 5, 4], Output array [6, 8, 4, 5, 3]
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Q1. Reverse the string and find occurance of character in java
Ans. 
To reverse a string and find the occurrence of a character in Java.
• Use StringBuilder to reverse the string.

• Use a loop to iterate through the string and count the occurrences of the character.

• Use the charAt() method to access individual characters in the string.
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Q2. Write screenshot script in selenium
Ans. 
To take a screenshot in Selenium, use the getScreenshotAs method
• Create a WebDriver instance

• Use the getScreenshotAs method to capture the screenshot

• Save the screenshot to a file using File class
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Q3. Write getter an setter method
Ans. 
Getter and setter methods are used to access and modify the values of private variables in a class.
• Create a method with the prefix 'get' followed by the variable name to retrieve its value.

• Create a method with the prefix 'set' followed by the variable name to set its value.

• Ensure the getter method returns the value of the variable and the setter method updates the variable with the passed value.
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Q4. Opps concept and its pillar
Ans. 
Object-oriented programming paradigm and its four pillars: Inheritance, Encapsulation, Abstraction, Polymorphism
• Inheritance: Allows a class to inherit properties and behavior from another class

• Encapsulation: Bundling data and methods that operate on the data into a single unit

• Abstraction: Hiding the complex implementation details and showing only the necessary features

• Polymorphism: Ability to present the same interface
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Q1. Explain the architecture of transformer models.
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Q2. What's the role of attention in transformers? Additionally, which one of the two networks has a faster training process - RNNs or transformers?
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Duration was 1 hour. First asked verbal technical questions based on deep learning concepts, then asked me to code an easy leet code problem.

This round was with the hiring manager. It was mostly like a technical discussion, but he started by discussing the projects that I had worked on from my resume. Then it eventually turned into a system design type of a round.

Q1. Javascript ques like 3-4
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Q1. LLD frontend on docs
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Q1. Manager discussion
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Q1. Frontend code quality
Ans. 
Frontend code quality is crucial for performance, maintainability, and scalability of web applications.
• Consistent coding style and conventions improve readability and maintainability.

• Modular and reusable code components enhance scalability and reduce duplication.

• Regular code reviews and testing ensure high quality and bug-free code.

• Optimizing performance by minimizing file sizes, reducing HTTP requests, and using effic...read more
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Q1. Manager diccussion
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