Copperpod Digital ml engineer Interview Questions and Answers

Aptitude test question logical reasoning and cheking availablity.

It's test last test and skill related to C ,Java, HTML

4 Coding Questions Were Given.
Check Palindrome String
Longest Increasing Subsequence
Group Anagrams
Add Two Numbers(Linked List)

Questions were picked from leetcode but the restriction of not using any inbuild function made them difficult to solve in the given time frame.

Q1. Basic Java Technical Questions
Add your answer
Q2. Throws Vs Throw
Ans. 
Throws is used for checked exceptions in Java, while throw is used to explicitly throw an exception.
• Throws is used in method signature to declare that the method may throw a checked exception.

• Throw is used to actually throw an exception in the code.

• Example: public void method() throws IOException { //code }

• Example: throw new IOException();
Answered by AI
Add your answer
Q3. Method Overriding Basics and Output-Based Questions
Add your answer
Q4. Springboot annotations
Add your answer
Q5. Inheritance and Concept of Abstract Classes and Interfaces
Ans. 
Inheritance allows a class to inherit properties and behaviors from another class. Abstract classes cannot be instantiated and can have abstract methods. Interfaces define a contract for classes to implement.
• Inheritance allows a class to inherit properties and behaviors from another class

• Abstract classes cannot be instantiated and can have abstract methods

• Interfaces define a contract for classes to implement
Answered by AI
Add your answer

Q1. Rate yourself in js, node js, react, MongoDB (separately)
Add your answer
Q2. Typeof null, typeof undefined, typeof {}, typeof NaN
Add your answer
Q3. What changes came in es6
Ans. 
ES6 introduced several new features and improvements to JavaScript, making it more powerful and efficient.
• Arrow functions for more concise syntax

• Let and const for block-scoped variables

• Classes for easier object-oriented programming

• Template literals for easier string interpolation

• Default parameters and rest parameters for function arguments

• Destructuring assignment for easier data extraction

• Promises for asynchronous prog
Answered by AI
Add your answer
Q4. This keyword, closures, hoisting
Add your answer
Q5. Are let and cont variables hoisted?
Ans. 
Yes, let and const variables are hoisted but not initialized.
• let and const variables are hoisted to the top of their block scope, but they are not initialized until the actual line of code is executed.

• This means that you cannot access a let or const variable before it is declared in the code.

• For example, trying to access a let variable before it is declared will result in a ReferenceError.
Answered by AI
Add your answer
Q6. What is global context
Ans. 
Global context refers to the overall environment or setting in which something exists or operates.
• Global context encompasses all variables, functions, and objects that are accessible throughout an entire program.

• It can be thought of as the 'big picture' view of a program's execution.

• In web development, global context includes the window object in JavaScript.
Answered by AI
Add your answer
Q7. What is temporal deadzone
Ans. 
Temporal dead zone is a period during the variable creation process where accessing the variable results in a ReferenceError.
• Occurs when trying to access a variable before it has been declared with let or const

• Happens due to the variable being in the temporal dead zone until it is declared

• Example: accessing a variable before its declaration will result in a ReferenceError
Answered by AI
Add your answer
Q8. What is modules? types of modules in nodejs
Ans. 
Modules in Node.js are reusable blocks of code that encapsulate related functionality.
• Modules in Node.js can be built-in modules like fs (file system) or third-party modules like express.

• Modules help in organizing code into separate files for better maintainability and reusability.

• Modules can be imported using the require() function in Node.js.
Answered by AI
Add your answer
Q9. Index in mongodb, why we need index, is index good or bad?
Ans. 
Indexes in MongoDB improve query performance by allowing the database to quickly locate and retrieve specific documents.
• Indexes help to speed up query performance by allowing the database to quickly locate specific documents based on the indexed fields.

• Without indexes, MongoDB would have to perform a collection scan, which can be slow and resource-intensive.

• Indexes can be created on single fields or compound fields to ...read more
Answered by AI
Add your answer
Q10. What are hooks , use of useRef
Ans. 
Hooks are a feature in React that allow you to use state and other React features in functional components. useRef is a hook that allows you to create a mutable object that persists for the lifetime of the component.
• Hooks are used to add state and lifecycle methods to functional components in React

• useRef is used to create a mutable reference that persists between renders

• useRef can be used to access DOM elements directl
Answered by AI
Add your answer
Q11. Fs module, http module, worker thread?
Add your answer
Q12. Why we use mongoose not mongodb driver?
Ans. 
Mongoose is an Object Data Modeling (ODM) library for MongoDB that provides a higher level of abstraction and simplifies interactions with the database.
• Mongoose provides schema validation which helps maintain data integrity.

• Mongoose simplifies querying and data manipulation with built-in functions.

• Mongoose supports middleware functions for pre and post processing of data operations.
Answered by AI
Add your answer

There are three sections: -
1. Quants
2. English
3. Reasoning
All sections are accessible medium but you have maintained the speed and accuracy.
after that coding snippet are in java/python.

Code snippets are there in coding sections.

First round was a coding test online with screen monitoring

Q1. Hacker rank code for no reason for de
Ans. 
The question is unclear and requires further clarification.
• Request for more information on the specific requirements of the code.

• Ask for clarification on the purpose of the code.

• Determine the programming language to be used.
Answered by AI
Add your answer
Q2. Python sort element of string array by alphabet weightage and resolve all 23 test cases that nobody can
Ans. 
Sort string array elements by alphabet weightage in Python and pass 23 test cases.
• Use the sorted() function with key parameter to sort elements by weightage

• Define a function to calculate weightage of each character

• Test the function with various test cases to ensure accuracy
Answered by AI
Add your answer

Q1. Spark, AWS, Python
Add your answer

Q1. Python, SQL, Spark
Add your answer

Q1. Salary discussion
Add your answer

Q1. General Interview
Add your answer

BASIC PYTHON AND SQL

Q1. Questions based on past experience
Add your answer
Q2. My roles and responsibilities
Add your answer

Q1. Easy HR questions
Add your answer

You will receive a test link in which you will have 4 mcq ,1 python problem and 1 sql question

Q1. This was also coding round on hackerrank with one moderator
Add your answer