Linkedin Node JS Assessment Answers 2023

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Linkedin Node JS Assessment Answers
Linkedin Node JS Assessment Answer

100% Free Updated Linkedin Node JS Assessment Certification Exam Questions & Answers.

Linkedin Node JS Assessment Details:

  • 15 – 20 multiple-choice questions
  • 1.5 minutes per question
  • Score in the top 30% to earn a badge

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Linkedin Node JS Assessment Answers

Q1. When a JavaScript function is invoked (called) in Node, where is a new frame placed?

  • [x] the call stack
  • [ ] the event loop
  • [ ] the poll phase
  • [ ] the events queue

Explanation: From javascript tutorial: reference

Q2. Which of the following is a core module in Node?

  • [ ] webpack
  • [x] crypto
  • [ ] request
  • [ ] chalk

Explanation: From flaviocopes docs: reference

Q3. Which of the following Buffer class methods returns an uninitialized buffer?

  • [x] allocUnsafe
  • [ ] concat
  • [ ] from
  • [ ] alloc

Explanation: From official docs: reference

Q4. Which of the following modules is NOT a built-in module in Node?

  • [x] ftp
  • [ ] events
  • [ ] dgram
  • [ ] http2

Explanation: From flaviocopes docs: reference

Q5. Which fs module method can be used to read the content of a file without buffering it in memory?

  • [ ] read
  • [ ] readFile
  • [x] createReadStream
  • [ ] readFileSync

Explanation: From official docs: reference To minimize memory costs, when possible prefer streaming via fs.createReadStream().

Q6. Which of the following DNS module methods uses the underlying OS facilities and does not necessarily perform any network communication?

  • [x] lookup
  • [ ] resolve
  • [ ] resolve4
  • [ ] reverse

Explanation: From official docs: reference

Q7. How do you check that a value is a date object in Node?

  • [x] util.types.isDate(value)
  • [ ] assert.isDate(value)
  • [ ] console.isDate(value)
  • [ ]

Explanation: From official docs: reference

Q8. Can you create an https web server with Node.js?

  • [ ] no, there are no modules supporting it yet
  • [x] yes, with the https or http2 modules
  • [ ] yes, through the path module
  • [ ] yes, with the http module

Explanation: From official docs: reference

Q9. What is the Api that is designed to insulate Addons from changes in the underlying JavaScript engine?

  • [ ] A-API
  • [ ] Z-API
  • [x] N-API
  • [ ] X-API

Explanation: From official docs: reference

Q10. Which CLI option can you use to debug a node script in Chrome DevTools?

  • [ ] –dev-tools
  • [x] –inspect
  • [ ] –chrome
  • [ ] –debug

Explanation: From official docs: reference

Linkedin Node Js Assessment Answers 2022

Q11. How can you count the number of logical CPUs on the machine that is running Node?

  • [ ] node -p “process.cpus”
  • [ ] node -p “util.cpus().size”
  • [ ] node -p “process.os.cpus”
  • [x] node -p “os.cpus().length”

Explanation: From coderrocketfuel docs: reference

Q12. Which of the following is a method on the console object?

  • [ ] exit
  • [ ] test
  • [x] time
  • [ ] print

Explanation: From official docs: reference

Q13. Which object is used to manage the cache of required modules?

  • [ ] global.cache
  • [ ] module.cache
  • [ ] process.cache
  • [x] require.cache

Explanation: From official docs: reference

Q14. What is the command to silence all process warnings?

  • [ ] node index.js –trace-warnings
  • [x] node –no-warnings
  • [ ] node -trace-warnings
  • [ ] node index.js –no-warnings

Explanation: From official docs: reference

Q15. How can you use the promise API with a callback-based function such as child_process.exec?

  • [ ] new Promise(child_process.exec())
  • [ ] util.promisify(child_process.exec())
  • [x] util.promisify(child_process.exec)
  • [ ] new Promise(child_process.exec)

Explanation: From official docs: reference

Q16. Which of the following is NOT a Node repl command?

  • [ ] .break
  • [x] .history
  • [ ] .editor
  • [ ] .save

Explanation: From official docs: reference

Q17. Which statement is true when you run the code shown below?


  • [ ] The forked process shares the event loop with the parent process
  • [ ] A new VM instance is created and the two VM instances will be shared between the forked process and the parent process.
  • [x] The forked process will have its own VM instance.
  • [ ] The forked process shares the same VM thread with the parent process.

Explanation: From official docs: reference

Q18. If EventEmitter is in scope, which of the following lines of code will have an event emitter emitting a change event?

  • [x] EventEmitter.emit(‘change’);
  • [ ]‘change’);
  • [ ] (new EventEmitter()).emit(‘change’);
  • [ ] new EventEmitter(‘change’);

Explanation: Because the EventEmitter is already in scope. No need to create new one.

Q19. Which of the following objects is a stream

  • [ ] process.uptime
  • [x] process.stdout
  • [ ] process
  • [ ] Buffer

Explanation: process.stdout is Buffer type.

Q20. Which module variable holds the resolved absolute path of the current module file?

  • [ ] __pathname
  • [ ] __location
  • [ ] __flder
  • [x] __filename

Linkedin Node Js Assessment Answers 2022

Q21. If the child_process module methods are in scope, what is a current way to execute the command ps -ef using a child process?

  • [ ] spawn(“ps -ef”)
  • [x] exec(“ps -ef”)
  • [ ] exec(“ps”, “-ef”)
  • [ ] fork(“ps -ef”)

Q22. Which console method can be used to print the stack trace to the point of its execution?

  • [ ] stack
  • [x] trace
  • [ ] debug
  • [ ] print

Q23. When you run JavaScript in a Node.js application, which of the following elements in a Node.js stack actually executes that JavaScript?

  • [ ] the libuv library
  • [ ] the c-ares library
  • [x] the VM (like VS or Chakra)
  • [ ] the repl module

Q24. Looking at the code below, what does the console show?

const http = require(‘http’);
const hostname = ‘’; const port = 3000;
const server = http.createServer((req, res) => {
res.statusCode = 200; res.setHeader(“Content-Type”, “text/plain”); res.end(“Hello World\n”);
server.listen(port, hostname, () => { console.log(server running at http://${hostname}:${port}/); });

  • [ ] server running at http://localhost:3000/
  • [ ] server running at port 3000
  • [ ] server running at http://localhost:4000/
  • [x] server running at

Q25. What is the purpose of the path module?

  • [x] to provide utilities to play with file and directory paths
  • [ ] to provide utilities to add and remove files
  • [ ] It is a retiring module.
  • [ ] to provide utilities to test files

Q26. How do you make an HTTP server object active and listen to requests on certain ports?

  • [ ] server. start
  • [ ] server.activate
  • [x] server.listen
  • [ ] server. run

Q27. What does the code shown below do?

const fs = require(‘fs’); const os = require(‘os’);
const system = os.platform(); const user = os.userInfo().username;
fs.appendFile(‘hello.txt’, Hello ${user} on ${system}, (err) => { if (err) throw err; console.log(‘The data was appended to file!’);}

  • [x] creates a text file hello.txt and appends customized text
  • [ ] creates an image file
  • [ ] console logs system information
  • [ ] creates a file named data and append numbers

Q28. How do you start a Node application, if the entry file is indexjs?

  • [ ] nodemon start
  • [ ] start index.js
  • [x] node index.js
  • [ ] node start

Q29. What is the purpose of the file system (fs) module?

  • [ ] to provide methods to work with requests and responses
  • [x] to provide methods to work with files
  • [ ] to provide methods to work with databases
  • [ ] to find new file systems

Q30. What is the Node LTS version?

  • [ ] It is the current unstable version and is to be avoided.
  • [ ] It is the version that will be retired soon.
  • [ ] It is the version with the latest features.
  • [x] It is the safest version for long-term support.

Linkedin Node Js Assessment Answers 2022

Q31. Which of the following is NOT a valid stream in Node?

  • [x] process. stdinfo
  • [ ] process. stdin
  • [ ] process. stdout
  • [ ] process. stderr

Q32. You have a script.js file with the single line of code shown here. What will be the output of executing script.js with the node command?


  • [ ] ReferenceError: arguments is not defined
  • [ ] an empty string
  • [ ] undefined
  • [x] an object representing an array that has five elements

Q33. Which choice is not a valid method on event emitters?

  • [x] start
  • [ ] on
  • [ ] once
  • [ ] off

Q34. Which special object is an instance of EventEmitter?Which special object is an instance of null?

  • [x] process
  • [ ] Buffer
  • [ ] root
  • [ ] require


Q35. What is the command to get a list of available commands for Node.js?What is the command to get a list of available commands for Node.js?

  • [ ] node index.js -x
  • [ ] node -v
  • [x] node -h
  • [ ] node index.js -h

Q36. When a request event is received in the HTTP module, what is the type of the first argument passed to that event, usually named req?

  • [x] http.IncomingMessage
  • [ ] http.ServerRequest
  • [ ] http.ClientRequest
  • [ ] http.ServerResponse

Q37. What are the arguments passed to the module wrapper function?

  • [ ] exports, __filename, __dirname
  • [ ] exports, process, require, module, __filename, __dirname
  • [ ] exports, module, __filename, __dirname
  • [x] exports, require, module, __filename, __dirname

Q38. Which library provides Node.js with the event loop?

  • [ ] V8
  • [ ] c-ares
  • [x] libuv
  • [ ] events

Q39. What does the .node file extension represent?

  • [ ] a C++ file that can have a .node extension and that Node will be able to execute directly.
  • [x] a C++ Addon file that is built with node-gyp
  • [ ] a JSON file that can have a .node extension as well as the .json extension
  • [ ] a JavaScript file that can have a .node extension as well as the .js extension

Q40. What can you export with module.exports?

  • [ ] only objects.
  • [ ] only functions
  • [ ] only variables and arrays
  • [x] functions, objects, arrays, or anything you assign to the module

Linkedin Node Js Assessment Answers 2022

Q41. Which core module in Node can you use to take advantage of multicore systems?

  • [ ] os
  • [ ] util
  • [x] cluster
  • [ ] net

Q42. Which core Node module has wrappers for OpenSSL methods?

  • [ ] SSL
  • [ ] hash
  • [x] crypto
  • [ ] TLS

Q43. Which line imports a promise-based version of the readFile method?

  • [x] const { readFile } = require(fs).promises
  • [ ] const { readFile } = require(fs)
  • [ ] const { readFilePromises: readFile } = require(fs)
  • [ ] const { readFile } = require(promises)

Q44. According to the rules of semantic versioning, what does a release incrementing the third number in an npm version string communicate to users about the release changes?

  • [ ] Changes are not backwards compatible.
  • [ ] Changes might not be backward compatible and might break existing code.
  • [x] Changes are just bug fixes and no new features were added.
  • [ ] Changes will add new functionality but will not break any existing code.

Q45. What does REPL stand for?

  • [ ] run, examine, put, loop
  • [x] read, eval, print, loop
  • [ ] run, edit, print, loop
  • [ ] read, extend, print, loop

Q46. Which file does node-gyp use to read the build configuration of a module?

  • [ ] .gyprc
  • [x] binding.gyp
  • [ ] gyp.json
  • [ ] package.gyp

Q47. Which core module in Node can you use for testing?

  • [ ] chai
  • [ ] jest
  • [x] assert
  • [ ] mocha

Q48. Which core module in Node provides an API to register callbacks to track asynchronous resources created inside a Node.js application?

  • [ ] cluster
  • [x] async_hooks
  • [ ] dgram
  • [ ] inspector

Q49. Which Node.js module should you use when you need to decode raw data into strings?

  • [ ] buffer
  • [ ] util
  • [x] string_decoder
  • [ ] string_buffer

Q50. Which global object acts like a bridge between a Node script and the host operating system?

  • [ ] v8
  • [ ] env
  • [x] process
  • [ ] child_process

Linkedin Node Js Assessment Answers 2022

Explanation: _process is an global object and act like a bridge, the others aren’t

  1. source
  2. source

Q51. Which statement is true about Node.js and threads?

  • [ ] Every Node process runs in a single thread, and all the I/O work is run in that same thread.
  • [ ] Every Node process gets four threads that it can share between its JavaScript VM and the event loop.
  • [x] The event loop is single-threaded, but a JavaScript VM can use multiple threads.
  • [ ] JavaScript execution in Node.js is single-threaded, but I/O operations are executed using multiple threads.


Q52. Which statement about event emitters is false?

  • [x] Event names must be camelCase strings.
  • [ ] The emit method allows a arbitrary set of arguments to be passed to the listener functions.
  • [ ] Any values returned by the listeners for an emitted events are ignored.
  • [ ] When an event emitter objeect emits an event, all of the functions attached to that specific event are called synchronously.

Q53. Which core module in Node can you use to compile and run JavaScript code in a sandbox environment?

  • [ ] sandbox
  • [ ] buffer
  • [x] vm
  • [ ] v8

Q54. How would you determine the number of cluster instances to start when using the cluster module?

  • [ ] const numInstances = cluster.instances().length;
  • [ ] const numInstances = cluster.instances();
  • [x] const numInstances = require(‘os’).cpus().length;
  • [ ] const numInstances = process.cpus().length;

Explanation: From official docs:

Q55. You have to read a large text file, replace some words in it, and write it back to a new file. You know that the memory on your target system is limited. What should you do?

  • [ ] Use regular expressions directly on the file.
  • [ ] Use Promises and async/await to offload the task to libuv.
  • [ ] Copy the file into a database and perform the operations there.
  • [x] Use readline together with streams to read and transform and write the file contents line by line.

Explanation: From official docs:

Q56. Which choice is not a Node global object?

  • [ ] process
  • [ ] exports
  • [ ] setTimeout
  • [x] Buffer

Explanation: process, exports and setTimeout are global objects, Buffer isn’t (please see

Q57. What is the correct way to pipe a readable stream and a writable stream?

  • [x] readableStream.pipe(writableStream)
  • [ ] readableStream.on(pipe, writableStream)
  • [ ] writableStream.pipe(readableStream)
  • [ ] writableStream.on(pipe, readableStream)

Q58. How can you convert path segments into a string using the platform-specific separator as a delimiter?

  • [ ] path.concat
  • [x] path.join
  • [ ] path.format
  • [ ] path.parse

Q59. What is the purpose of N-API?

  • [ ] to allow users to make requests to the server
  • [x] to insulate Addons from changes in the underlying JavaScript engine
  • [ ] to execute multi-threaded code in the Node environment
  • [ ] to provide a quick way for users to create REST APIs

Q60. What is a process object and its role?

  • [ ] a locally scoped object that provides information about the current node process
  • [ ] a global object that provides information about files
  • [ ] a global object that provides information about the database
  • [x] a global object that provides information about the current node process

Linkedin Node Js Assessment Answers 2022

Q61. What will this code log to the console?

// File: person.js = “Jane”;

// File: index.js
const person = require(‘./person.js’);

  • [ ] {'Jane'}
  • [x] { name: 'Jane' }
  • [ ] {}
  • [ ] Jane

Q62. What will this code log to the console?

// File: person.js
exports = “John”;

// File: index.js
const person = require(‘./person.js’);

  • [ ] John
  • [ ] Undefined
  • [ ] {'John'}
  • [x] {}

Q63. Is it possible to write tests in Node.js without an external library?

  • [x] yes, through the assert module
  • [ ] yes, through the debugger module
  • [ ] yes, through the console module
  • [ ] no

From the article: Making a Testing Framework in Node.js (Without any External Libraries)

Q64. Which assert module method is usually used to test the error-first argument in callbacks?

  • [ ] fail
  • [ ] doesNotThrow
  • [ ] deepStrictEqual
  • [x] ifError

Q65. Which choice is not a method on the util module?

  • [ ] promisify
  • [x] asyncify
  • [ ] types
  • [ ] callbackify

Q66. Which choice is not a subclass of the Error class?

  • [x] GlobalError
  • [ ] TypeError
  • [ ] RangeError
  • [ ] AssertionError

Q67. What is Node built on?

  • [ ] Python
  • [x] V8 JavaScript engine
  • [ ] PHP
  • [ ] c

Q68. How does it affect the performance of a web application when an execution path contains a CPU-heavy operation, such as calculating a long Fibonacci sequence?

  • [ ] As Node.js is asynchronous, this is handled by a libuv and a threadpool. The performance will not notably degrade.
  • [ ] As the application code runs asynchronously within a single thread, the execution will block, accepting no more requests until the operation is completed.
  • [ ] As Node.js is asynchronous, this is handled by a threadpool and the performance will not notably degrade.
  • [x] The current thread will block until the executon is completed and the operating system will spawn new threads to handle incoming requests. This can exhaust the number of allowed threads (255) and degrade performance over time.

Q69. What is used for parsing and running Javascript in Node.js?

  • [ ] EventLoop
  • [ ] Libuv
  • [x] Google V8
  • [ ] Express.js

Q70. What is the importance of having good practices around status code in your response?

  • [ ] It indicates success or failure to the client and helps with testing.
  • [ ] It is not important to have good practices regarding status codes
  • [ ] Response codes are the only way you can tell what is happening on the server.
  • [x] It contains information about the current performance of the server.

Linkedin Node Js Assessment Answers 2022

Q71. How can ECMAScript modules be used natively in Node?

  • [x] ECMAScript modules cannot be used natively in Node.
  • [ ] ECMAScript modules can be used natively in Node with the .mjs file extension
  • [ ] ECMAScript modules can be used natively in Node only by using a compiler like Babel.
  • [ ] ECMAScript modules can be used natively in Node only by using a bundle like webpack.

Q72. When exploring the Node documentation’s features, what are the stability ratings?

  • [x] They are an indication of the stability of Nodejs modules and usage recommendations.
  • [ ] They tell if a feature is ES6 compliant.
  • [ ] They are a Node command to validate stability of your code.
  • [ ] They tell if a feature is LTS (Long Term Supported).

Q73. Which of the following DNS module methods uses the underlying OS facilities and does not necessarily perform any network communication?

  • [x] lookup
  • [ ] resolve
  • [ ] reverse
  • [ ] resolve4

Q74. Which coice is a core module in Node?

  • [x] crypto
  • [ ] chalk
  • [ ] webpack
  • [ ] request


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What is Linkedin Assessment?

The LinkedIn Skill Assessments feature allows you to demonstrate your knowledge of the skills you’ve added to your profile by completing assessments specific to those skills. LinkedIn skills evaluations are a means to demonstrate the skills of job hunters. This is how LinkedIn Skill Assessments can be used.

Is this Skill Assessment Test is free?

Yes, Linkedin Node JS Assessment Answers is totally free on LinkedIn for you. The only thing is needed i.e. your dedication toward learning.

When I will get Skill Badge?

Yes, if will Pass the Skill Assessment Test, then you will earn a skill badge that will reflect in your LinkedIn profile. For passing in LinkedIn Skill Assessment, you must score 70% or higher, then only you will get your to skill badge.

How to participate in skill quiz assessment?

It’s good practice to update and tweak your LinkedIn profile every few months. After all, life is dynamic and (I hope) you’re always learning new skills. You will notice a button under the Skills & Endorsements tab within your LinkedIn Profile: ‘Take skill quiz.‘ Upon clicking, you will choose your desired skill test quiz and complete your assessment.

LinkedIn Skill Assessments are a series of multiple-choice exams that allow you to prove the skills that are stated in your profile.

How to get Linkedin Skill Badge?

For getting Linkedin Badge in your profile, you need to score at least 70% and above for getting recognition of skill badges.

If you “grade in the 70th percentile or above”—according to LinkedIn—you officially pass and get a LinkedIn skill badge. The social media site will display your badge on your profile.

How long is Skill Assessment valid for?

Skills assessments that do not specify an expiry date are valid for 3 years from the date of the assessment. If more than 3 years have passed by the time the visa application is made, the skills assessment will no longer be valid.

What is the Benefit of Linkedin Skill Assessment?

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Who can give this Linkedin Skill Assessment Test?

Any Linkedin User, Any engineer, developer, or programmer, who wants to improve their Programming Skills
Anyone interested in improving their whiteboard coding skills
Anyone who wants to become a Software Engineer, SDE, Data Scientist, Machine Learning Engineer, etc.
Any students in college who want to start a career in Data Science
Students who have at least high school knowledge in math and who want to start learning data structures
Any self-taught programmer who missed out on a computer science degree.

How to do LinkedIn skill assessment

The LinkedIn Skill Assessments feature allows you to demonstrate your knowledge of the skills you’ve added on your profile by completing assessments specific to those skills.

A typical assessment consists of 15 multiple choice questions and each question tests at least one concept or subskill. The questions are timed and must be completed in one session. You can view the full list of available Skill Assessments and sample questions for each.

Available Skill Assessments on LinkedIn

.NET FrameworkAgile Methodologies, Amazon Web Services (AWS), Android, AngularJS, Angular, AutoCAD, AWS, Bash, C, C#, C++, CSS, GIT, Hadoop, HTML, Java, JavaScript, jQuery, JSON, Maven, and MS Vision, QuickBooks, Revit, etc.

What You Need to Know About LinkedIn Skill Assessments

During a job search, wouldn’t it be great to have a way to prove your proficiency in a specific skill to hiring managers?

Well, now there is. On September 17, LinkedIn launched its new Skill Assessments feature. These are online assessments you can take to demonstrate your proficiency in an area such as MS Excel or jQuery. All assessments have been designed by subject matter and LinkedIn Learning experts, and they’re based on an in-depth content creation and review process. Moreover, these assessments seem to be well received: Research shows that job seekers who’ve completed LinkedIn Skill Assessments are approximately 30 percent more likely to get hired than those who haven’t.

How LinkedIn Skill Assessments work
To take an assessment, all you have to do is navigate to the skills section of your profile and select the relevant Skill Assessment. Note that the test is timed. If you have a disability, you can activate the accessibility for the Skill Assessment feature. This will allow you additional time to complete each question.

Your score is private by default, meaning that you can control the visibility of the results. If you score in the 70th percentile or higher, you’ll pass the assessment and have the option of displaying a “verified skill” badge on your profile. If you don’t pass, you can take the assessment again once you’ve brushed up your skills. However, keep in mind that you can only take each assessment once per three months

When you’ve completed an assessment, LinkedIn provides you with an outline of your results. In addition, for a limited time, it offers relevant LinkedIn Learning courses for free so you can improve further. You’ll also receive relevant job recommendations.

According to Andrew Martins in his Business News Daily article “LinkedIn Users Can Now Showcase Skill Assessments,” the following assessments are currently available:

Adobe Acrobat, Angular, AWS, Bash, C, C#, C++, CSS, GIT, Hadoop, HTML, Java, Javascript, jQuery, JSON, Maven, MongoDB, MS Excel, MS PowerPoint, MS Project, MS SharePoint, MS Visio, Node.js, Objective-C, PHP, Python, QuickBooks, Ruby, Ruby on Rails, Scala, Swift, WordPress, and XML. Experts believe that there are also more, non-technical assessments in the making.

A good way to showcase your skills
LinkedIn Skill Assessments offer a brilliant way for you to showcase your abilities to potential employers while at the same time giving you the opportunity to hone your skills even further. So, take advantage of what’s offered — and use it to maximize your employability!

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