NSE.IT Senior Engineer 3 Interview Questions and Answers

Q1. How to print numbers 1-100 using two go routines sequentially
Ans. 
Use two go routines to print numbers 1-100 sequentially
• Create two go routines, one for printing odd numbers and one for printing even numbers

• Use channels to synchronize the two go routines and ensure sequential printing

• Start the odd number go routine first, then start the even number go routine
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Q2. How to write generator functions using go language
Ans. 
Generator functions in Go language allow for efficient iteration over a sequence of values.
• Use the 'yield' keyword to return values one at a time from the generator function.

• Generator functions are defined with a 'func' keyword followed by the function name and 'chan' keyword.

• Example: func myGenerator() chan int { }

• Use a 'for' loop to iterate over the values returned by the generator function.
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Q1. Why do we use sync.Cond and sync.once
Ans. 
sync.Cond is used for signaling between goroutines and sync.Once is used for running initialization code only once.
• sync.Cond is used for goroutines to wait for or signal each other when a certain condition is met

• sync.Once is used to ensure a function is only executed once, typically used for initialization tasks

• Example: Using sync.Cond to coordinate multiple goroutines accessing a shared resource

• Example: Using sync.Onc...read more
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Q2. Understanding about reflect package
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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
Ans. 
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
Ans. 
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
Ans. 
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. What are the OOPS concepts
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Q2. MultiThreading, synchronization
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Q1. Tell me about yourself
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Q1. What is meant by RTM
Ans. 
RTM stands for Requirements Traceability Matrix, a document that links requirements to test cases to ensure all requirements are covered.
• RTM is a document used in software testing to ensure that all requirements are covered by test cases.

• It helps in tracking the progress of testing by linking each requirement to its corresponding test case.

• RTM is a useful tool for ensuring comprehensive test coverage and for identifyin...read more
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Q2. Los-LMS process
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Q3. Difference between regression and Sanity
Ans. 
Regression testing ensures existing functionality still works after changes, while sanity testing checks if new functionality works as expected.
• Regression testing is done to make sure that new code changes have not affected existing functionality.

• Sanity testing is a cursory testing to make sure that the new functionality is working as expected.

• Regression testing is comprehensive and covers all areas of the application.

• ...read more
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Q4. Quality assurance vs quality control
Ans. 
Quality assurance focuses on preventing defects, while quality control focuses on identifying and fixing defects.
• Quality assurance involves processes and procedures to prevent defects from occurring.

• Quality control involves activities to identify defects and ensure they are fixed.

• Quality assurance is proactive, while quality control is reactive.

• Examples of quality assurance include code reviews, process audits, and tra...read more
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Q1. What is meant by unit test and who do it
Ans. 
Unit test is a type of testing where individual units or components of a software are tested in isolation.
• Unit test is performed by developers to ensure that each unit of code is working correctly.

• It helps in identifying bugs early in the development process.

• Unit tests are usually automated and run frequently during the development cycle.

• Examples of unit testing frameworks include JUnit for Java, NUnit for .NET, and py
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Q2. What is difference between test plan and test design
Ans. 
Test plan outlines the overall testing approach, while test design specifies how individual test cases will be created and executed.
• Test plan is a high-level document outlining testing objectives, resources, schedule, and scope

• Test design is a detailed document specifying test cases, test data, and expected results

• Test plan focuses on the overall testing strategy, while test design focuses on the specifics of individua
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Q3. When will you automate a website
Ans. 
Automate a website when repetitive tasks need to be performed frequently and consistently.
• Automate when manual testing becomes time-consuming and inefficient

• Automate when the website has a large number of test cases that need to be executed regularly

• Automate when the website undergoes frequent changes and regression testing is required

• Automate when the website needs to be tested across multiple browsers and devices
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Q1. Technical skills related questions
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Q2. Hands on / live coding
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Q1. Deep knowledge checking for mentioned skill
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Aptitude test with aptitude based questions

Q1. What is variable hoisting.
Ans. 
Variable hoisting is a behavior in JavaScript where variable declarations are moved to the top of their scope during compilation.
• Variable declarations are hoisted to the top of their function or global scope.

• Only the declarations are hoisted, not the initializations.

• This can lead to unexpected behavior if variables are accessed before they are declared.
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Q2. What is closures in js
Ans. 
Closures in JavaScript allow functions to access variables from an outer function even after the outer function has finished executing.
• Closures are created whenever a function is defined within another function.

• Inner functions have access to the outer function's variables even after the outer function has returned.

• Closures are commonly used to create private variables and functions in JavaScript.

• Example: function outer...read more
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Q1. Tell me about yourself.
Ans. 
Experienced Senior Design Engineer with a passion for innovation and problem-solving.
• Over 10 years of experience in designing and developing products in various industries

• Strong background in mechanical engineering and CAD software

• Proven track record of leading successful design projects from concept to completion

• Passionate about staying up-to-date with the latest technology and trends in the field
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Q2. Tell me about your previous company experience
Ans. 
I have 5 years of experience working as a Senior Design Engineer at a leading technology company.
• Led a team of engineers in developing new product designs

• Collaborated with cross-functional teams to ensure project success

• Implemented cost-effective design solutions to meet project goals
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Q1. How do you read an external text file
Ans. 
To read an external text file, you can use file handling techniques in programming languages like Python or Java.
• Use file handling functions like open(), read(), and close() in Python to read an external text file.

• In Java, use classes like FileReader and BufferedReader to read text files.

• Specify the file path and mode (read mode) when opening the file.

• Read the contents of the file line by line or as a whole, depending ...read more
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Q2. Write a java program to find the occurrences of characters
Ans. 
Java program to find occurrences of characters in a string
• Create a HashMap to store characters and their counts

• Iterate through the string and update the counts in the HashMap

• Print the characters and their counts from the HashMap
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