CommLab India E Learning Developer Interview Questions and Answers

Questions in aptitude section was easy and would require good analytical and quantitative skills.

Total 10 questions
6 debugging question
4 easy-medium level coding questions (2 Marks + 3 Marks + 3 Marks + 3 Marks)

Q1. OOPs, Project, SQL Queries, Puzzle/Apptitude
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Data structure and algorithm, easy and medium questions

1st round
25 mcq apptitude + 10 DSA question

Q1. Project review , opps, sql
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Basic Aptitude test followed by 2 coding questions. Test was very easy.

This was pen and paper coding test, where we were given 20 questions and we had to write code on paper. Total time was 2-3 hr.

Q1. Technical Interview, 2 coding questions asked, 1 math question and Basics like OOP, Language specific, etc.
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I have given the online aptitude test of zeus learning (on campus) , which was the very first round and the test was divided into two parts, first part was mostly coding-decoding questions (aptitude) which was easy according to me but it was tricky too and second part included 2 dsa question and both the questions were of easy level.

Test was of 1.5 hrs and it was online. It was completely based on technical questions.

This test was offline and it was a pen paper test wherein 10 questions will be given you have to write code or spot the error and correct them.

Q1. Asked questions about React
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Q2. Question based on project
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So prepare good amout of aptitude , and try to solve at least 15 Questions

It was an Online coding test 2 questions were there. difficulty (Easy and Medium).

The third round was again an coding round but it was a pen and paper test , it was in offline mode they will tell you the center after you will complete 2nd round.
In pen and paper test there are 10 coding questions and from topics array , string , recursion , Bit manipulation , BST , Linked List. so you have to solve at least 6-7 questions.

Q1. Questions on HTML, CSS
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Q2. Permutations in string (Can you Backtracking approach). Always try to explain your approach
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Q3. Explain your Project?
Ans. 
Developed a web application for managing inventory and sales for a retail store.
• Used HTML, CSS, and JavaScript for front-end development.

• Implemented backend functionality using Node.js and MongoDB for database management.

• Incorporated user authentication and authorization features for secure access.

• Integrated payment gateway for online transactions.

• Utilized responsive design for mobile compatibility.
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25 questions of quants and logical and 10 questions of coding, some were debugging some were coding

Q1. Discussion about my resume projects
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Q2. Return addition and subtraction of two numbers from the same function
Ans. 
A function that returns the addition and subtraction of two numbers.
• Create a function that takes two numbers as input parameters.

• Inside the function, calculate the sum of the two numbers and store it in a variable.

• Calculate the difference of the two numbers and store it in another variable.

• Return an array of strings containing the sum and difference.
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Q3. Print leaf nodes of binary tree
Ans. 
Print leaf nodes of binary tree
• Traverse the tree recursively

• If node is null, return

• If node is leaf node, print it

• Else, recursively traverse left and right subtrees
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Q4. What is the protocol used for communication over web pages
Ans. 
HTTP is the protocol used for communication over web pages.
• HTTP stands for Hypertext Transfer Protocol

• It is the foundation of data communication on the World Wide Web

• HTTP uses a client-server model where the web browser acts as the client and sends requests to the web server

• The web server responds with the requested data in the form of HTML, images, videos, etc.
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