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NodeJS Basics

1/25 What does the async/await syntax in Node.js provide?
- A way to execute SQL queries
- A cleaner syntax for working with promises
- Synchronous blocking operations
- Immediate execution of asynchronous code
2/25 What command is used to remove a package in Node.js using npm?
- npm delete package-name
- npm remove package-name
- npm uninstall package-name
3/25 Which of the following is used to create a RESTful web service in Node.js?
- The http module
- The fs module
- The url module
4/25 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
5/25 How does Node.js handle non-blocking operations?
- Using callbacks
- Using promises
- Using async/await syntax
- By pausing the execution of the entire application
6/25 What does NPM stand for?
- Node Package Manager
- Network Protocol Module
- New Programming Methodology
7/25 Which of the following methods can be used to prevent a program from exiting immediately in Node.js?
- process.exit()
- process.stayAlive()
- setInterval()
8/25 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
9/25 What is the purpose of the .env file in Node.js applications?
- To set environment variables
- To configure the Node.js runtime environment
- To store encrypted variables
10/25 What is the command to list all the global packages installed with npm?
- npm list -g
- npm global list
- npm show all
11/25 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
12/25 What is the main advantage of using async/await in Node.js?
- It allows running synchronous operations
- It simplifies the syntax for working with promises, making asynchronous code easier to write and read
- It improves the performance of the Node.js application
- It automatically handles all errors in the application
13/25 How can you securely store sensitive data like passwords in Node.js applications?
- Using the crypto module for hashing and encryption
- Storing them in a .env file as plain text
- Using local storage for persistence
- Encrypting them with the fs module
14/25 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
15/25 In Node.js, what is a middleware in the context of Express applications?
- A database management system
- Functions that have access to the request object, the response object, and the next middleware function
- A client-side JavaScript library
16/25 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
17/25 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
18/25 Which function is used to read data from a readable stream in Node.js?
- stream.read()
- stream.getData()
- stream.fetch()
19/25 What does the 'fs.writeFileSync()' method do in Node.js?
- Writes data to a file asynchronously
- Writes data to a file, blocking the Node.js event loop until the file is written
- Writes data to multiple files simultaneously
20/25 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
21/25 What is the command to list installed packages in a Node.js project?
- npm list
- npm installed
- node list-packages
22/25 What is the purpose of the Node.js 'cluster' module?
- To distribute incoming network connections across multiple worker processes
- To manage multiple database clusters
- To enable real-time communication between clients and servers
23/25 What does the 'util.inspect()' method do in Node.js?
- Converts an object into a string representation
- Inspects the performance of a Node.js application
- Checks the usability of a module
24/25 How do you make an HTTP POST request using the Axios library in Node.js?
- axios.post('/url', { data })
- axios('/url', 'POST', { data })
- axios.send('POST', '/url', { data })
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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