Z X Learning Data Science Trainer Interview Questions and Answers

Easy aptitude questions based on logical reasoning and basic maths.

Easy logic-based question based on arrays and strings with some javascript output-based questions.

Discussion about the projects that I made in college and the tech stack I know.
1 basic array/string-based problem.

Logical reasoning and non verbal questions

Basic dsa concepts and find the syntax error

Q1. Basics about oops dsa question and question related to your projects
Add your answer

Object oriented programming questions

Combination of all letters in a word

Test consist of 25 Apatitude Question and 10 Coding problems of Debugging code, Find Output, Set Matrixs, Valid Matrix, Height of N-ary Tree, Sorting, Linked List etc. So prepare well with standard dsa problems of any sheet (striver sheet)

Q1. Technical Round consist of one coding question and detailed discussion on my smart india hackathon project and counter question on it with some of question on performance and security.
Ans. Performance Technique in React/Node ReactJS Interview Question
Answered by Dharmesh Vala
Add your answer
Q2. Find 2nd Largest Element in array
Ans. 
Iterate through array to find 2nd largest element
• Iterate through array and keep track of largest and second largest elements

• Handle edge cases like empty array or array with less than 2 elements

• Example: ['3', '5', '2', '7', '1'] should return '5'
Answered by AI
View 1 more answer
Q3. Question on Redux also asked to pass information in reactjs.
Ans. Before interview refer redux documentation and standard interview question.
Answered by Dharmesh Vala
Add your answer
Q4. Authentication and Authorization question on my project
Add your answer
Q5. Security issues in your project
Add your answer

Q1. SQL question difference between having and where
Ans. 
HAVING is used with GROUP BY to filter groups, WHERE is used to filter rows
• HAVING is used with GROUP BY to filter groups based on aggregate functions

• WHERE is used to filter rows based on conditions

• HAVING is applied after GROUP BY, WHERE is applied before GROUP BY

• Example: SELECT department, AVG(salary) FROM employees GROUP BY department HAVING AVG(salary) > 50000;

• Example: SELECT * FROM employees WHERE department = 'S
Answered by AI
Add your answer

3 questions in 3 hr, topics were Dp, Strings, Tree

1hr durations 40 questions, main topics were patterns, profit loss, work man , etc.

Q1. OOPS, JAVA, Mysql, general questsjons
Add your answer

Basic question of indiabix topics and 10 code questions

Q1. Resume based questions,coding questions,core subject questions
Add your answer
Q2. What is indexing in dbms?
Ans. 
Indexing in DBMS is a technique to improve the performance of queries by allowing faster retrieval of data.
• Indexing creates a data structure that allows for quick lookups of data based on specific columns.

• It helps in reducing the time taken to retrieve data from a database table.

• Examples of indexing methods include B-tree, Hash indexes, and Bitmap indexes.
Answered by AI
Add your answer
Q3. Secondlargest element
Add your answer
Q4. Pascal triangle
Add your answer

My name is amar reverse the string without using inbuilt method

Q1. What is nodejs and what is promise. What is closures
Ans. 
Node.js is a runtime environment for executing JavaScript code outside of a web browser. Promises are objects representing the eventual completion or failure of an asynchronous operation. Closures are functions that have access to their own scope, as well as the scope in which they were defined.
• Node.js is a runtime environment that allows you to run JavaScript on the server-side.

• Promises are used in asynchronous progra...read more
Answered by AI
Add your answer