Test Your Node.js Knowledge: Multiple Choice Questions (MCQ)

Challenge your understanding of Node.js with this set of multiple-choice questions. This quiz covers core concepts, modules, and best practices, providing a fun and effective way to assess your Node.js expertise.

Node.js Multiple Choice Questions (MCQ)

Introduction

This section presents multiple-choice questions (MCQs) covering various aspects of Node.js. These questions test your understanding of core concepts, modules, and common development practices.

Multiple Choice Questions

1. Which of the following statements is correct about Node.js?
   1. Node.js is a server-side language.
   2. Node.js is a client-side language.
   3. Node.js is both server-side and client-side.
   4. None of the above.
   Show Answer

   A is correct. Node.js is primarily a server-side runtime environment.

2. What does REPL stand for?
   1. Read Eval Print Loop
   2. Research Eval Program Learn
   3. Read Earn Point Learn
   4. Read Eval Point Loop
   Show Answer

   A is correct. REPL stands for Read-Eval-Print Loop.

3. Which command starts a REPL session?
   1. node
   2. node start
   3. node repl
   4. node console
   Show Answer

   A is correct. Simply running node in your terminal starts the REPL.

4. Node.js is written in:
1. JavaScript
2. C
3. C++
4. CoffeeScript
5. All of the above
Show Answer

E is correct. Node.js uses a combination of languages.

5. How do you install the Express.js module?
1. npm install express
2. node install express
3. install express
4. None of the above
Show Answer

A is correct.

6. What is a callback function?
1. A function that calls another function.
2. An asynchronous function equivalent.
3. Both of the above
4. None of the above
Show Answer

B is correct. A callback is primarily used for asynchronous operations.

7. Node.js files typically use which extension?
1. .js
2. .node
3. .java
4. .txt
Show Answer

A is correct.

8. How are Node.js modules exposed?
1. expose
2. module
3. exports
4. All of the above
Show Answer

C is correct. Use module.exports.

9. Which of these is NOT a built-in Node.js module?
1. zlib
2. https
3. dgram
4. fsread
Show Answer

D is correct.

10. Which `fs` module method gets file information?
1. fs.open()
2. fs.stat()
3. fs.readFile()
4. None of the above
Show Answer

B is correct. fs.stat() provides file statistics.

11. What does the `fs` module stand for?
1. File Service
2. File System
3. File Store
4. File Sharing
Show Answer

B is correct. `fs` stands for File System.

12. Which `fs` method truncates a file?
1. fs.delete()
2. fs.remove()
3. fs.ftruncate()
4. None of the above
Show Answer

C is correct.

13. A template engine usable with Node.js is:
1. Jade
2. Vash
3. Handlebars
4. All of the above
Show Answer

D is correct. Many templating engines work with Node.js.

14. Which code snippet prints the operating system platform?
1. console.log('platform : ' + os.platform);
2. console.log('platform : ' + os.platform());
3. console.log('platform : ' + os.getPlatform());
4. None of the above
Show Answer

B is correct. Use os.platform().

15. Which method gets the current working directory?
1. cwd()
2. cwd()
3. pwd()
4. None of the above
Show Answer

A is correct. Use process.cwd().

16. What best describes Express.js?
1. A framework for desktop apps.
2. A minimal and flexible Node.js web application framework.
3. Both of the above.
4. None of the above.
Show Answer

B is correct.

17. Which is NOT a benefit of Express.js modules?
1. Task separation.
2. Code reuse.
3. Reduced program size.
4. Easier testing.
Show Answer

C is correct. Modules don't directly reduce program size.

18. A best practice for performance optimization is:
1. Using gzip compression.
2. Avoiding synchronous functions.
3. Proper logging.
4. Effective exception handling.
Show Answer

While all are good practices, A (gzip compression) directly impacts performance.

19. The default scope in Node.js is:
1. Global
2. Local
3. Global Function
4. Local to object
Show Answer

B is correct. Variables are typically locally scoped unless declared globally.

20. Node.js uses which JavaScript engine?
1. Chrome V8
2. Microsoft Chakra
3. SpiderMonkey
4. Node Engine
Show Answer

A is correct.

21. How do you run a file named `sample.js`?
1. sample.js
2. node sample.js
3. nodejs sample.js
4. None of the above
Show Answer

B is correct.

22. Which is NOT a valid language for Node.js?
1. JavaScript
2. Java
3. C
4. C++
Show Answer

B is correct. Node.js primarily uses JavaScript.

23. What's the shortcut to kill a Node.js process?
1. Ctrl + B
2. Ctrl + K
3. Ctrl + T
4. Ctrl + C
Show Answer

D is correct.

24. How many object methods are in Node.js's `os` module?
1. 21
2. 18
3. 19
4. 20
Show Answer

B is correct (This might need verification based on the specific Node.js version).

25. The main use of Node.js's REPL is:
1. Application preview.
2. Testing expressions.
3. Executing browser JavaScript.
4. None of the above.
Show Answer

B is correct.

26. What application types can Node.js build?
1. Web applications
2. Chat applications
3. RESTful services
4. All of the above
Show Answer

D is correct.

27. Which operator checks node equality?
1. ==
2. equal()
3. isEqualNode()
4. None of the above
Show Answer

C is correct (This depends on the context; `isEqualNode()` is common in DOM APIs).

28. Which tool automates Node.js tasks?
1. Express.js
2. GruntJS
3. npm
4. None of the above
Show Answer

B is correct. GruntJS is a popular task runner.

29. When is Node.js NOT recommended?
1. Single-page applications
2. JSON API applications
3. CPU-intensive applications
4. Real-time applications
Show Answer

C is correct. Node.js is not ideal for CPU-bound tasks.

30. Which is a valid Express.js route parameter format?
1. /books/!:from-:to
2. /flights/:from-:to
3. /users/:userId/books/:bookId
Show Answer

While all *could* work depending on the implementation, C is the most standard and recommended format.

Conclusion

This MCQ section tested your knowledge of various Node.js concepts. Regularly reviewing these types of questions will help solidify your understanding.