Top 50 MERN Stack MCQs with Answers
Prepare for interviews with the Top 50 MERN Stack MCQs with Answers covering MongoDB, Express.js, React, and Node.js. Test your knowledge and boost your skills!
1. What is the full form of HTML?
a. Hypertext Machine Language
b. Hyper Tone Markup Language
c. Hyper Text Markup Language
d. Hyper Test Markup Language
Answer: Option c. Hyper Text Markup Language
2. Which of the following html tag is used to render a paragraph?
a. <para>
b. <p>
c. <paragraph>
d. None of the above
Answer: Option b. <p>
3. What is the use of <a> tag in html?
a. To create hyperlink
b. To render image
c. To create table
d. There is no such a tag
Answer: Option a. To create hyperlink
4. Which of the following HTML elements is used to render an image?
a. image
b. photo
c. img
d. All of the above
Answer: Option c. img
5. Which is the root element of html document?
a. head
b. body
c. div
d. html
Answer: Option d. html
6. What is the full form of CSS?
a. Class Style Sheet
b. Cascading Style Sheet
d. Class Sheet Style
Answer: Option b. Cascading Style Sheet
7. What are different ways to include CSS in html?
a. Inline CSS
b External CSS
c. Internal CSS
d. All of the above
Answer: Option d. All of the above
8. Which CSS property is used to set the font?
a. font-name
b. font
c. font-family
d. font-type
Answer: Option c. font-family
9. What is the use of CSS property text-align?
a. To align the text to the center of the HTML element
b. To align the text to the left of the HTML element
c. To align the text to the right of the HTML element
d. All of the above
Answer: Option d. All of the above
10. Which of the following is the correct statement about HTML & CSS?
a. HTML focuses on what is to be displayed and CSS focuses on how is to be displayed
b. HTML focuses on how is to be displayed and CSS focuses on what is to be displayed
c. Both HTML and CSS focus on what is to be displayed
d. Both HTML and CSS focus on how is to be displayed
Answer: Option a. HTML focuses on what is to be displayed and CSS focuses on how is to be displayed
11. What are the possible values of CSS property display?
a. inline
b. block
c. none
d. All of the above
Answer: Option d. All of the above
12. What is Bootstrap?
a. HTML Framework
b. Javascript library
c. CSS Framework
d. None of the above
Answer: Option c. CSS Framework
13. Which is the correct statement about CSS ID and CSS Class?
a. Both CSS ID and CSS Class can be used with only one HTML element
b. Both CSS ID and CSS Class can be used with many HTML elements
c. CSS ID can be used with many HTML elements and CSS Class can be used with a single HTML element only
d. CSS ID can be used with a single HTML element only and CSS Class can be used with many HTML elements
Answer: Option d. CSS ID can be used with single HTML element only and CSS Class can be used with many HTML elements
14. Which is a true statement about Bootstrap?
a. It is a collection of readymade HTML elements
b. It is a collection of readymade CSS IDs
c. It is a collection of readymade CSS classes
d. None of the above
Answer: Option c. It is a collection of readymade CSS classes
15. Which of the following is the incorrect bootstrap class for the background color?
a. bg-primary
b. bg-failure
c. bg-success
d. bg-light
Answer: Option b. bg-failure
16. Which of the following is the correct way to use the Bootstrap CSS library in HTML document?
a. <style src=”bootstrap.min.css”>
b. <link src=”bootstrap.min.css”>
c. <link href=”bootstrap.min.css” rel=”stylesheet”>
d. <style href=”bootstrap.min.css” rel=”stylesheet”>
Answer: Option c. <link href=”bootstrap.min.css” rel=”stylesheet”>
17. Which of the following is the correct option for the feature of Javascript?
a. Scripting Language
b. Asynchronous Programming
c. Event Driven
d. All of the above
Answer: Option d. All of the above
18. Which of the following keywords is used to declare a javascript variable?
a. let
b. int
c. char
d. float
Answer: Option a. let
19. Which of the following is not an object-oriented principle?
a. Abstraction
b. Inheritance
c. Interface
d. Encapsulation
Answer: Option c. Interface
20. Which of the following is the correct statement?
a. Javascript and Java are the same programming languages
b. Javascript and Java are different programming languages
c. Javascript and Java are both compiled programming languages
d. Javascript and Java are asynchronous programming languages
Answer: Option b. Javascript and Java are different programming languages
21. Which of the following loops are used in javascript?
a. for
b. do-while
c. while
d. All of the above
Answer: Option d. All of the above
22. For decision-making, which of the following programming features is used?
a. while
b. if..else
c. function
d. array
Answer: Option b. if..else
23. Which of the following is the correct statement about function?
a. Block of statements
b. Can accept parameters
c. Can return result
d. All of the above
Answer: Option d. All of the above
24. What is an Object?
a. Real-world entity
b. Variable declared in the program
c. Class
d. None of the above
Answer: Option a: Real-world entity
25. Which of the following is an ES6 Feature?
a. var keyword
b. function
c. Spread Operator
d. switch..case
Answer: Option c. Spread Operator
26. What is React?
a. Frontend UI Development library in Javascript
b. Backend Development library in Javascript
c. Programming Language
d. Backend Development Java Framework
Answer: Option a. Frontend UI Development library in Javascript
27. Which of the following companies has created React JS?
a. Twitter
b. Instagram
c. Facebook
d. Google
Answer: Option c. Facebook
28. Which of the following is the feature of React?
a. Single Page Application
b. Virtual DOM
c. MVC
d. All of the above
Answer: Option d. All of the above
29. JSX stands for
a. Java Stack and Xml
b. Javascript and XML
c. Javascript and HTML
d. None of the above
Answer: Option b. Javascript and XML
30. Which of the following statements is true about React Hook?
a. Special function of which name begins with “use”
b. It helps React Component to make use of React Feature
c. It should be called at the top level of the component
d. All of the above
Answer: Option d. All of the above
31. What is the full form of MVC?
a. Module Velocity Controller
b. Model Velocity Command
c. Module View Command
Answer: Option d. Model View Controller
32. Which of the following is used to achieve data flow between components?
a. props
b. state
c. hook
d. All of the above
Answer: Option a. props
33. What is Node JS?
a. Service side Development Javascript library
b. Client-side Development Javascript library
c. Both a and b
d. None of the above
Answer: Option a. Service side Development Javascript library
34. Which of the following is not a feature of Node JS?
a. Event Loop
b. Single-Threaded
c. Multithreaded
d. Asynchronous Programming
Answer: Option c. Multithreaded
35. Which of the following is the correct option for asynchronous programming?
a. Functional Style of programming
b. Non-blocking programming
c. Blocking programming
d. None of the above
Answer: Option b. Non-blocking programming
36. Which of the following Node modules is used for file handling?
a. express
b. networking
c. buffer
d. fs
Answer: Option d. fs
37. Which of the following is a false statement about the buffer module?
a. It needs to be imported into the JS app
b. It need not be imported into the JS app
c. It is used to reserve byte memory apart from heap
d. All of the above
Answer: Option a. It needs to be imported in js app
38. What is Event Loop?
a. Loop of events
b. Semi-infinite loop of events which executes tasks in first in last out manner
c. Endless loop which continuously waits for asynchronous tasks from event queue
d. It is used to perform network IO operations
Answer: Option a. Endless loop which continuously waits for asynchronous tasks from the event queue
39. Which of the following Javascript classes is used to trigger events?
a. Event
b. EventTrigger
c. EventSource
d. EventEmitter
Answer: Option d. EventEmitter
40. What is Express JS?
a. Web application development framework in Javascript
b. Frontend UI development framework only
c. Both a and b
d. None of the above
Answer: Option a. Web application development framework in Javascript
41. Which of the following is a feature of Express JS?
a. Single-Threaded
b. Middleware
c. Routing
d. All of the above
Answer: Option d. All of the above
42. Which of the following is third-party middleware?
a. express.json()
b. body-parser
c. express.urlencoded()
d. express.static()
Answer: Option b. body-parser
43. Which of the following is a Web Service?
a. SOAP-based
b. RESTful
c. Both a and b
d. None of the above
Answer: Option c. Both a and b
44. Which of the following statements is true about Web Service?
a. To achieve communication between applications in different programming languages
b. Software System for interoperable Machine to Machine-to-Machine Communication
c. Collection of Open Protocol and Open Standards
d. All of the above
Answer: Option d. All of the above
45. What is MongoDB?
a. Relational Database
c. Structured Database
d. All of the above
Answer: Option b. NoSQL Database
46. In which format data is stored in MongoDB?
a. Tabular format
b. Document Format
c. Text Format
d. JSON Format
Answer: Option d. JSON Format
47. How is the data arranged in MongoDB Database?
a. Collections and Documents
b. Tables and Rows
c. Collections and Rows
d. Tables and Documents
Answer: Option a. Collections and Documents
48. Which of the following is a query operator in MongoDB?
a. $group
b. $limit
c. $lt
d. $set
Answer: Option c. $lt
49. Which of the following is not an aggregation pipeline operator of MongoDB
a. $sort
b. $set
c. $group
d. $limit
Answer: Option b. $set
50. Which of the following layers focuses on Data Access logic in layered applications?
a. Presentation Layer
b. Persistence Layer
c. Service Layer
d. None of the above
Answer: Option b. Persistence Layer
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