Comviva Technology Sde1 Interview Questions and Answers

Verbal,quants

Q1. Sql, oops data structure
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There were simple aptitude questions and core java MCQS

Q1. What's OOPs concept
Ans. 
OOP is a programming paradigm based on the concept of objects, which can contain data in the form of fields and code in the form of procedures.
• Encapsulation: Bundling data and methods that operate on the data into a single unit (object).

• Inheritance: Ability of a class to inherit properties and behavior from another class.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding th...read more
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Q2. Explain Inheritance
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Inheritance is a concept in object-oriented programming where a class inherits properties and behaviors from another class.
• Allows a class to inherit attributes and methods from another class

• Promotes code reusability and reduces redundancy

• Creates a parent-child relationship between classes

• Derived class can override or extend the functionality of the base class

• Example: Class 'Car' can inherit from class 'Vehicle' and inh...read more
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Q3. Basic Java output questions
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Q1. Interviewer asked me to introduce and then he asked about my education and family details and then he told me about company.
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Q1. What are closures
Ans. 
Closures are functions that have access to variables from their containing scope even after the scope has closed.
• Closures allow functions to access variables from their outer function even after the outer function has finished executing.

• They are commonly used in event handlers, callbacks, and asynchronous programming.

• Closures help in maintaining state in functional programming.
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Q2. What is virtual DOM
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Virtual DOM is a lightweight copy of the actual DOM used for efficient updates in web development.
• Virtual DOM is a concept used in frameworks like React to improve performance by minimizing actual DOM manipulations.

• When changes are made to the virtual DOM, a comparison is done with the actual DOM to determine the minimal updates needed.

• This approach reduces the number of costly DOM operations, resulting in faster rende
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Q3. What are the data types in JS
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Data types in JavaScript include number, string, boolean, object, function, undefined, and null.
• Number - represents numeric data, e.g. 10, 3.14

• String - represents textual data, e.g. 'hello', '123'

• Boolean - represents true or false values, e.g. true, false

• Object - represents complex data structures, e.g. { key: 'value' }

• Function - represents executable code, e.g. function() { }

• Undefined - represents a variable that has ...read more
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Q1. Write react code for counter
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React code for a simple counter
• Create a functional component for the counter

• Use useState hook to manage the count state

• Render the count value and buttons to increment and decrement the count
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Q1. Salary discussion
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Q1. Multiple questions on Linux , how to get a process id, how to kill a process, what is difference between process and thread, what is the difference between concurrent and parallel process etc.
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Q2. Few scenario based questions around linux systems, how will you trouble shoot if client not able to connect to servers running an appilcation.
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Q3. Testing related questions, what is diff between Performance and Scale testing, where to use which one
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Q1. Coding questions basics, related to file handling, parsing files, etc.
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Q2. Linux based questions - scenarios where multiple clients trying to write to same file, how till integrity of file be maintained and how will server manager the data does not get corrupted.
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Q1. What is Observables, Services, Promises, Closure ?
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Topic - dowry for me and different topics for others

Pen paper test assignment was given for coding

Q1. Encapsulation OOPS Live coding
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Q2. Coding question
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Q1. Basic information like:- why you want to change job, and some similar questions...
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Q1. Intermediate level questions on joins, cursor, bulk collect, trigger ....
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Q1. How to manage memory management in Python?
Ans. 
Memory management in Python involves automatic memory allocation and deallocation through garbage collection.
• Python uses automatic memory management through garbage collection, so manual memory management is not required.

• Use tools like memory_profiler to identify memory leaks and optimize memory usage.

• Avoid creating unnecessary objects and use data structures efficiently to minimize memory usage.
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Q2. Difference between Async , Sync and multithread?
Ans. 
Async is non-blocking, Sync is blocking, Multithread allows multiple threads to run concurrently.
• Async allows the program to continue executing other tasks while waiting for a response, commonly used in web development with AJAX calls.

• Sync blocks the program until a task is completed, commonly used in simple sequential programs.

• Multithreading allows multiple threads to run concurrently, improving performance by utilizi...read more
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Q3. CI/CD pipeline deployment?
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Q4. How to revert last commit?

Ans. 

Use 'git revert' command to revert the last commit.

• Use 'git log' to find the commit hash of the last commit

• Run 'git revert ' to revert the last commit

• Commit the revert changes with a new commit message

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