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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 Which of the following are true about Node.js streams?
- Streams are used to handle reading/writing files
- Streams can only be used for network communications
- Streams allow Node.js to process data in chunks, improving performance for large data processing
- Streams are a collection of data that must be buffered entirely before processing
3/25 How does Node.js handle child processes?
- It cannot create child processes
- Using the child_process module to execute other applications
- By forking the main Node.js process for each new child
- Through the use of web workers
4/25 Which of the following is an EventEmitter function used to register a listener for a named event?
- event.on()
- event.listen()
- event.register()
5/25 Which of the following is used to create a RESTful web service in Node.js?
- The http module
- The fs module
- The url module
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 Which method is used to read the content of a file in Node.js?
- fs.readFile()
- fs.readContent()
- fs.getContent()
8/25 What does NPM stand for?
- Node Package Manager
- Network Protocol Module
- New Programming Methodology
9/25 How do you set an environment variable in Node.js?
- process.env.VAR_NAME = 'value';
- set VAR_NAME='value';
- env.set('VAR_NAME', 'value');
10/25 In Node.js, how can you monitor the execution time of an asynchronous operation?
- Using the console.time() and console.timeEnd() methods
- Using the process.time() method
- Using a custom timing module
- It's not possible to accurately measure asynchronous operations
11/25 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
12/25 How do you update npm to its latest version?
- npm update npm
- npm install -g npm@latest
- npm upgrade npm
13/25 What is the command to list all the global packages installed with npm?
- npm list -g
- npm global list
- npm show all
14/25 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
15/25 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
16/25 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
17/25 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
18/25 What is the output of 'console.log(1 + '2' + 3)' in Node.js?
- '123'
- 6
- '15'
19/25 Which module is used to create a web server in Node.js?
- http
- server
- net
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 How can you ensure your dependencies are installed at the exact versions listed in your package-lock.json?
- npm install --exact
- npm ci
- npm install --lock
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 What is the command to list installed packages in a Node.js project?
- npm list
- npm installed
- node list-packages
25/25 What is the difference between 'exports' and 'module.exports' in Node.js?
- 'exports' is a shorthand for 'module.exports'
- 'exports' can export multiple objects, functions, or values
- 'module.exports' can only export a single object, function, or value
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