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NodeJS Basics

1/25 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
2/25 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
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 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 What is the default scope of Node.js modules?
- Global
- Local to the file they are defined in
- Local to the directory they are located in
8/25 What does NPM stand for?
- Node Package Manager
- Network Protocol Module
- New Programming Methodology
9/25 Which of the following is NOT a valid stream in Node.js?
- ReadStream
- WriteStream
- QuickStream
10/25 Which of the following methods can be used to prevent a program from exiting immediately in Node.js?
- process.exit()
- process.stayAlive()
- setInterval()
11/25 What is the purpose of the package.json file in a Node.js application?
- To store configuration settings
- To define the application entry point
- To list dependencies and scripts
- To compile the application code
12/25 Which of the following allows Node.js to provide a non-blocking I/O model?
- Single-threaded model
- Use of the libuv library
- Multi-threaded model
- Synchronous execution
13/25 How do you update npm to its latest version?
- npm update npm
- npm install -g npm@latest
- npm upgrade npm
14/25 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
15/25 What is the significance of package-lock.json in a Node.js project?
- It locks the versions of the packages installed
- It automatically updates packages to their latest versions
- It is a backup of the package.json file
- It speeds up the npm install process
16/25 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
17/25 In Node.js, which method is used to spawn a child process?
- process.spawn()
- child_process.spawn()
- system.spawnProcess()
18/25 Which of the following correctly checks for the presence of an environment variable in Node.js?
- if (process.env.VAR_NAME) {}
- if (env.VAR_NAME) {}
- if (system.getEnv('VAR_NAME')) {}
19/25 What is the primary use of the Node.js 'events' module?
- Logging events to a file
- Creating and handling custom events
- Scheduling events for future execution
20/25 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
21/25 How do you send a status code of 404 with a message in Express?
- res.status(404).send('Not Found')
- res.send(404, 'Not Found')
- res.sendStatus('404 Not Found')
22/25 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
23/25 Which of the following is true for process.nextTick() in Node.js?
- It is used to defer the execution of a function until the next loop iteration
- It schedules a function to execute at the beginning of the next event loop
- It is the same as setting a timeout with zero milliseconds
24/25 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
25/25 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 })
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