Node.js MCQs: Advanced Questions for Assessing Back-End JavaScript Skills

Node.js has made it to the technology list required for developing back-end systems using JavaScript with its scalability and efficiency. Assessing candidates' Node.js skills is a key indicator of talent acquisition for back-end developers. The most efficient technique for creating assessment tasks is using Node.js interview questions.

In this article, we will cover the key functionalities of Node.js and some Node.js MCQ interview questions for assessing back-end JavaScript skills. 

The Key Functionalities of NodeJS

The following are some of the key functionalities of Node.js that you should remember:

• Generates dynamic page content
• On the server side javascript, it helps in creating, opening, reading, writing, deleting and closing files
• It can scan the forms
• It can add, delete and modify data in the database

Advanced Node.js MCQs for Assessing the Back-End JavaScript Skills

Now, let’s look at some advanced Node.js MCQs that might be asked to you during the back-end interview to assess your back-end JavaScript skills:

Q1. What is Node.js?

1. A front-end JavaScript framework
2. A server-side JavaScript runtime
3. A database management system
4. A CSS preprocessor

Answer: The correct answer to this advanced Node.js MCQ is ‘B’ - A server-side JavaScript runtime

Q2. What is True About Node.js?

1. It is single-threaded and asynchronous
2. It supports only synchronous I/O operations
3. It is primarily used for client-side scripting
4. It does not support event-driven programming

Answer: The correct answer to this advanced Node.js MCQ is ‘A’ - It is single-threaded and asynchronous.

Q3. What is the Primary Use of Node.js?

1. Building user interface
2. Writing server-side logic and APIs
3. Managing databases
4. Styling web pages

Answer: B. Writing server-side logic and APIs

Q4. Node.js Uses Which Engine to Execute JavaScript Code?

1. Spider Monkey
2. V8
3. Chakra
4. Rhino

Answer: The correct answer to this advanced Node.js MCQ is ‘B’ - V8

Q5. Which Module is Used to Create a Web Server in Node.js?

1. fs
2. HTTP
3. path
4. URL

Answer: The correct answer to this advanced Node.js MCQ is ‘B’ - HTTP

Q6. What is Express.js?

1. A database management system
2. A front-end JavaScript library
3. A framework for building web applications with Node.js
4. A package manager for Node.js

Answer: C. A framework for building web applications with Node.js

Q7. Which of the Following is True About Express.js?

1. It is built on top of the Django framework
2. It is used only for client-side scripting
3. It simplifies the process of building web servers and APIs in Node.js
4. It does not support routing

Answer: C. It simplifies the process of building web servers and APIs in Node.js.

Q8. What is NPM in the Context of Node.js?

1. Node Project Manager
2. Node Package Manager
3. Node Programming Module
4. Node Process Manager

Answer: The correct answer to this advanced Node.js MCQ is ‘B’ - Node Package Manager

Q9. Which Command is Used to Install Dependencies Listed In package.json?

1. npm update
2. npm add
3. npm install
4. npm require

Answer: The correct answer to this advanced Node.js MCQ is ‘C’ - npm install

Q10. How can Errors be Handled in Node.js?

1. Using try...catch blocks
2. Using if...else statements
3. By ignoring them
4. Errors cannot be handled in Node.js

Answer: The correct answer to this advanced Node.js MCQ is ‘A’ - Using try...catch blocks

Q11. What is the Event Loop in Node.js?

1. A mechanism for handling HTTP requests
2. A feature for executing JavaScript code synchronously
3. A loop that iterates through events and executes callback functions
4. A data structure used for storing event listeners

Answer: C. A loop that iterates through events and executes callback functions

Q12. What is True About Asynchronous Programming in Node.js?

1. Asynchronous functions always execute before synchronous functions
2. Asynchronous functions block the event loop
3. Asynchronous functions do not require callback functions
4. Asynchronous functions allow non-blocking I/O operations

Answer: D. Asynchronous functions allow non-blocking I/O operations.

Q13. Which Module is Used for File System Operations in Node.js?

1. HTTP
2. fs
3. path
4. URL

Answer: The correct answer to this advanced Node.js MCQ is ‘B’ - fs

Q14. What is Middleware in the Context of Express.js?

1. A software architecture pattern
2. A database management system
3. A function that has access to the request and response objects
4. A package manager for Node.js

Answer: C. A function that has access to the request and response objects

Q15. How do you Apply Middleware to Specific Routes in Express.js?

1. By using the app.use() method
2. By passing it as an argument to the route handler function
3. By using the app.route() method
4. By using the app.use() method with a path argument

Answer: D. By using the app.use() method with a path argument

Q16. Which of the Following Databases is Commonly Used with Node.js?

1. MySQL
2. SQLite
3. MongoDB
4. All of the above

Answer: The correct answer to this advanced Node.js MCQ is ‘D’ - All of the above

Q17. What is Middleware Precedence in Express.js?

1. Middleware are executed in the order they are defined
2. Middleware is executed based on their route paths
3. Middleware defined later takes precedence over earlier middleware
4. Middleware execution order is random

Answer: A. Middleware is executed in the order they are defined.

Q18. How do you Handle Errors in Express.js?

1. By using try...catch blocks in route handlers
2. By defining error-handling middleware functions
3. By ignoring errors and letting the server crash
4. Express.js does not support error handling

Answer: B. By defining error-handling middleware functions

Q19. What is the Purpose of the Next Parameter in Express.js Middleware Functions?

1. It terminates the middleware chain
2. It passes control to the next function in the stack
3. It handles errors thrown by the middleware
4. It sets the HTTP response status code

Answer: B. It passes control to the next function in the stack.

Q20. What is Used to Handle Asynchronous Control Flow?

1. Promises
2. Callbacks
3. Async/await
4. All of the above

Answer: The correct answer to this advanced Node.js MCQ is ‘D’ - All of the above

Q21. Which Node.js Module is Commonly Used to Interact with Databases?

1. fs
2. HTTP
3. mongoose
4. express

Answer: The correct answer to this advanced Node.js MCQ is ‘C’ - mongoose

Q22. What is CommonJS in Node.js?

1. A package manager
2. A module system for organizing JavaScript code
3. A built-in web server
4. A testing framework

Answer: B. A module system for organizing JavaScript code

Q23. How do you Export a Module in Node.js?

1. Using the module.export keyword
2. Using the export keyword
3. Using the exports object
4. All of the above

Answer: The correct answer to this advanced Node.js MCQ is ‘D’ - All of the above

Q24. How do you Define Routes in Express.js?

1. Using the app.route() method
2. By assigning functions to specific URLs
3. By configuring routes in a separate configuration file
4. All of the above

Answer: B. By assigning functions to specific URLs

Q25. What is Load Balancing?

1. Distributing incoming requests across multiple server instances
2. Minimizing the size of client-side JavaScript code
3. Optimizing database queries for faster retrieval
4. None of the above

Answer: A. Distributing incoming requests across multiple server instances

Q26. What is the Method Used to Read a File Asynchronously in Node.js?

1. fs.readFile()
2. fs.read()
3. fs.open()
4. fs.createReadStream()

Answer: The correct answer to this advanced Node.js MCQ is ‘A’ - fs.readFile()

Q27. What is the Purpose of the Async Keyword in JavaScript?

1. It defines a function that always returns a promise
2. It indicates that a function is asynchronous
3. It allows the use of the await keyword within the function
4. All of the above

Answer: The correct answer to this advanced Node.js MCQ is ‘D’ - All of the above

Q28. Which Strategy is Used to Optimize the Performance of a Node.js Application?

1. Caching
2. Minification
3. Load balancing
4. All of the above

Answer: The correct answer to this advanced Node.js MCQ is ‘D’ - All of the above

Prepare your IT Interview with Interview Kickstart

The Node.js MCQs have very well been covered in this article. Evaluating candidates' knowledge in these areas of expertise is of particular importance. Through MCQ, recruitment managers may easily measure the candidates' knowledge level of Node.js so that the system can ascertain applicants' competence for back-end development positions.

Start your next interview preparation with Interview Kickstart’s Back-End Engineering Interview Masterclass and get your dream job.

The questions given here are about the candidate's assessment, and real-time experience and practical skills are also included in the candidate's evaluations to measure competence for the node.js back-end development role. Stay curious, never get bored of learning and explore more. 

Happy Coding!

FAQs: Node.js MCQs for Assessing Back-End JavaScript Skills

Q1. Where can Node.js be used? 

Node.js is an open-source platform that can be used to create server-side javascript-based web applications.

Q2. Why use Node.js?

The reasons why node.js should be used include:

• Its fast speed
• It is a unified programming language 
• Everything is asynchronous

Q3. Why is Node.js Single-Threaded? 

Node.js is single-threaded for asynchronous processing.

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