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NodeJS Basics

1/25 What does the 'event loop' in Node.js do?
- Handles asynchronous I/O operations
- Generates events for the application
- Loops through an array of events
2/25 How can you make a function available in all modules of your Node.js application?
- Declare it globally
- Export the function using module.exports
- Copy the function into each module
3/25 Which of the following is an EventEmitter function used to register a listener for a named event?
- event.on()
- event.listen()
- event.register()
4/25 Which of the following is used to create a RESTful web service in Node.js?
- The http module
- The fs module
- The url module
5/25 What is the purpose of the Buffer class in Node.js?
- To handle binary data
- To buffer all the application data in memory
- To manage application caching
6/25 Which of the following best describes the Node.js global object?
- An object that provides functions and variables that can be used anywhere in the application
- A global variable that stores user session data
- A module that needs to be imported before use
7/25 How does Node.js handle non-blocking operations?
- Using callbacks
- Using promises
- Using async/await syntax
- By pausing the execution of the entire application
8/25 What is the main difference between npm and npx?
- npm is a package manager, while npx is a tool to execute packages
- npx is a JavaScript runtime, npm is not
- npm installs packages globally, while npx does not
- There is no difference; they are the same tool
9/25 Which of the following methods can be used to prevent a program from exiting immediately in Node.js?
- process.exit()
- process.stayAlive()
- setInterval()
10/25 What is the primary use case for the Node.js crypto module?
- Performing cryptographic operations like hashing and encryption
- Generating random numbers
- Creating secure network connections
- Managing cryptocurrency transactions
11/25 How do you update npm to its latest version?
- npm update npm
- npm install -g npm@latest
- npm upgrade npm
12/25 What is the command to list all the global packages installed with npm?
- npm list -g
- npm global list
- npm show all
13/25 How can you ensure that a function is executed after all callbacks have completed in Node.js?
- Using the async module's series method
- Using the Promise.all method
- By nesting callbacks
- Using the EventEmitter class
14/25 In Node.js, which method is used to spawn a child process?
- process.spawn()
- child_process.spawn()
- system.spawnProcess()
15/25 What is the purpose of the 'util.promisify' function in Node.js?
- To convert a callback-based function into a promise-based one
- To create a new Promise object
- To optimize utility functions for performance
16/25 What is the purpose of the Node.js 'cluster' module?
- To enable load balancing over multiple CPU cores
- To manage a cluster of database connections
- To cluster data for machine learning tasks
- To synchronize the execution of multiple node instances
17/25 In Node.js, how can you listen for and respond to uncaught exceptions?
- process.on('uncaughtException', function(err) {});
- try...catch on the global level
- window.onerror for Node.js applications
18/25 What is the best practice for managing asynchronous code in Node.js?
- Using nested callbacks
- Using Promises and async/await
- Executing synchronous functions in parallel
- Avoiding asynchronous code
19/25 Which of the following statements about Node.js is true?
- Node.js can only run on Linux operating systems
- Node.js is a single-threaded, non-blocking, asynchronous programming environment
- Node.js does not support ES6 features
20/25 In Node.js, what does the 'path.join()' method do?
- Joins all given path segments together
- Joins two arrays into one
- Concatenates two strings
21/25 Which of these statements about the Node.js 'crypto' module is true?
- It provides cryptographic functionality that includes a set of wrappers for OpenSSL's hash, HMAC, cipher, decipher, sign, and verify functions
- It is used for creating cryptographically secure random numbers
- It can only encrypt data but cannot decrypt
22/25 Which function is used to read data from a readable stream in Node.js?
- stream.read()
- stream.getData()
- stream.fetch()
23/25 In Node.js, which of the following is true about environment variables?
- They can store application configuration separately from code
- They are accessible through the 'process.env' object
- They can only be set within the application code
24/25 How can template literals be used in Node.js?
- For defining SQL queries
- To concatenate strings and variables
- To create HTML templates
25/25 Which method is an effective way to handle rejected promises in async/await syntax in Node.js?
- Using a try/catch block
- Using the .catch() method on each promise
- Using process.on('unhandledRejection', handler)
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