Node Js Online Test

1. In Node.js, which core module is commonly used to create HTTP servers?

http fs net url

2. What is the primary trigger for AWS Lambda functions in serverless applications?

Database queries HTTP requests Manual execution Network monitoring

3. What is a callback function in the context of asynchronous programming in Node.js?

A function that always executes synchronously A function used for creating HTML templates A function passed as an argument to another function, which is executed later when a specific task is complete A function for database management

4. In Node.js, what is the purpose of using a secure connection (HTTPS) over HTTP for web communication?

To make the application slower To provide a more user-friendly experience To encrypt data transmission to protect against eavesdropping and man-in-the-middle attacks To improve database migrations

5. What does it mean to "scale horizontally" in the context of Node.js application scalability?

Adding more resources to a single server Increasing the number of servers in the application's infrastructure Reducing the application's complexity Scaling the database vertically

6. In the context of Node.js performance, what is "caching"?

A method for managing hardware devices Storing frequently accessed data in memory to reduce redundant computations and speed up responses The process of creating static HTML templates A type of routing strategy

7. What is the primary purpose of the pg module in Node.js?

To create HTML templates To manage hardware devices To establish a connection to a PostgreSQL database and perform database operations To handle client-side rendering

8. What is a key advantage of using streams in Node.js for I/O operations?

Streams are only suitable for handling small amounts of data. Streams automatically handle error handling and data validation. Streams allow data to be processed piece by piece, reducing memory consumption and improving performance. Streams can only be used for reading data, not writing data.

9. Which core module allows Node.js applications to perform network operations and create network servers or clients?

http fs net path

10. Which Node.js testing library is commonly used for E2E testing of web applications?

Jest Puppeteer Chai Axios

11. In Node.js CLI development, what is the purpose of the process.argv property?

To store application data To define project metadata To access command-line arguments passed to the script To manage server configurations

12. Which npm command is used to install project dependencies listed in the "package.json" file?

npm start npm install npm create npm run

13. What is the purpose of the Node Package Manager (npm)?

To create HTML templates To manage database migrations To install, manage, and share JavaScript packages and dependencies To define API routes

14. Which performance optimization technique in Node.js focuses on minimizing the number of external HTTP requests by bundling assets like JavaScript and CSS?

Load balancing Minification Compression Asset bundling

15. Which core module is used for working with events and creating custom event emitters in Node.js?

http fs events url

16. Which Node.js module is commonly used for connecting to PostgreSQL databases?

mongo mysql postgresql pg

17. Which core feature of Express.js simplifies the creation of web routes and handling of HTTP requests and responses?

Middleware Promises Templates Cookies

18. What is the primary purpose of middleware in a Node.js application?

To manage database migrations To create HTML templates To process and manipulate HTTP requests and responses in a modular and organized manner To establish network connections

19. What is the purpose of the app.use() method in Express.js?

To define API routes To create HTML templates To specify middleware functions that should be executed for incoming requests To manage database connections

20. What is the primary purpose of testing in Node.js development?

To create HTML templates To identify and fix bugs and errors in the application code To handle database migrations To optimize network connections