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NodeJS Basics
1/25
What is Node.js primarily used for?
Front-end development
Back-end development
Graphic design
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2/25
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
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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
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4/25
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
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5/25
How can you debug a Node.js application?
Using the debugger statement and Node.js inspector
Using console.log() statements only
By restarting the Node.js server multiple times
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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
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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
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8/25
How do you set an environment variable in Node.js?
process.env.VAR_NAME = 'value';
set VAR_NAME='value';
env.set('VAR_NAME', 'value');
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9/25
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
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10/25
What does the 'require' function do in Node.js?
Loads a JavaScript library
Imports a module
Requests data from a web service
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11/25
What does the Node.js os module provide?
Functions for interacting with the operating system
Methods for online storage
Utilities for network operations
Information about the current operating system
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12/25
In Node.js, which method is used to spawn a child process?
process.spawn()
child_process.spawn()
system.spawnProcess()
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13/25
What is the use of the 'express' package in Node.js?
Data encryption
Web application framework
File compression
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14/25
How do you enable strict mode in a Node.js file?
use strict;
enable strict;
strict mode;
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15/25
Which method in the fs module is used to asynchronously delete a file?
fs.unlink()
fs.remove()
fs.delete()
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16/25
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
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17/25
Which of the following are considered best practices in Node.js error handling?
Using try/catch for synchronous code
Using process.on('error', callback) for global error handling
Handling errors at the root level of the application
Using Promises or async/await for asynchronous error handling
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18/25
Which environment variable is commonly used to set the port for a Node.js web server?
PORT
SERVER_PORT
HTTP_PORT
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19/25
Which module is used to create a web server in Node.js?
http
server
net
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20/25
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')
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21/25
What are Promises in Node.js used for?
To handle asynchronous operations
To execute multiple callbacks sequentially
To generate cryptographic keys
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22/25
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
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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
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24/25
Which Node.js method is used to execute a function after a specified number of milliseconds?
setTimeout()
nextTick()
setInterval()
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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
Next >
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