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Welcome to your MongoDB

1.

How does MongoDB store data?

In flat files

In tables with rows and columns

In XML format

In JSON-like documents

None

2.

How can you serve static files in Express.js?

Using the express.static() middleware

By configuring the static route

Using the serveFiles() function

Using the app.static() method

None

3.

How do you update state in a React component?

Directly modify the state variable

By using setEffect()

By dispatching an action

By calling setState()

None

4.

How can you handle errors in Node.js using callbacks?

By passing the error object as the second argument of the callback.

By passing the error object as the first argument of the callback.

By using try/catch.

By emitting an 'error' event.

None

5.

Which of the following is a correct MongoDB replica set configuration?

Primary-Secondary-Backup

Primary-Secondary-Arbiter

Leader-Follower-Observer

Master-Slave-Follower

None

6.

What does the command db.collection.find() do in MongoDB?

It updates documents

It creates a new document

It retrieves documents

It deletes documents

None

7.

What does the 'require' function in Node.js do?

It reads a file.

It loads modules.

It initiates a server.

It compiles the code.

None

8.

What is the purpose of next() in Express.js?

To terminate the request

To send a response immediately

To pass control to the next middleware

To halt the server

None

9.

What is React primarily used for?

erver configuration

Backend development

Database management

Frontend development

None

10.

What is the role of the 'package.json' file in a Node.js project?

It contains the application code.

It holds the server configuration.

It handles routing.

It stores project dependencies and metadata.

None

11.

Which module is used to create a server in Node.js?

events

fs

buffer

http

None

12.

What is React Router used for?

Creating navigational routes

Handling HTTP requests

Managing state

Connecting to a database

None

13.

Which middleware in Express.js is used to parse incoming JSON requests?

express.json()

bodyParser.json()

express.urlencoded()

parseJSON()

None

14.

What does the res.send() method do in Express.js?

Sends an HTTP response

Sends headers only

Sends a file to the client

Sends a redirect response

None

15.

Which hook is used to handle side effects in React?

useEffect()

useState()

useReducer()

useContext()

None

16.

Which of the following is used to create an index in MongoDB?

db.collection.addIndex()

db.collection.index()

db.collection.makeIndex()

db.collection.createIndex()

None

17.

How do you create a functional component in React?

function ComponentName() {}

const ComponentName = new Component();

class ComponentName extends React.Component {}

component ComponentName = () => {};

None

18.

What is the purpose of the $lookup operator in MongoDB?

It performs a search

It deletes data

It joins data from different collections

It updates fields in a document

None

19.

What type of database is MongoDB?

Relational

Graph

Key-Value

Document-oriented

None

20.

Which command is used to insert a document in MongoDB?

db.collection.insertOne()

db.createDocument()

db.insert()

None

21.

What is Express.js primarily used for?

Frontend development

Backend development

Database management

Version control

None

22.

What is the default scope of variables in Node.js modules?

Global scope

Block scope

Local to the module

Local to the function

None

23.

What is the purpose of state in React?

To manage the app's routes

To handle database connections

To store component data

To define component styles

None

24.

Which React method is used to render a component?

display()

return()

show()

render()

None

25.

Which of the following is true about the 'fs' module?

It handles HTTP requests.

It provides functions for database connections.

It is a built-in Node.js module for event handling.

It is used for file system operations.

None

26.

What is the purpose of 'streams' in Node.js?

To manipulate arrays.

To handle HTTP requests.

To handle I/O operations in a continuous and efficient way.

To handle user authentication.

None

27.

What does the 'process.nextTick()' method do in Node.js?

Adds a task to the queue to be executed immediately.

Delays the execution of a function.

Stops the event loop.

Adds a task to the next iteration of the event loop.

None

28.

Which method is used to read the content of a file in a non-blocking way in Node.js?

fs.read()

fs.openSync()

fs.readFileSync()

fs.readFile()

None

29.

What is the default port number for an Express.js application?

8080

4000

5000

3000

None

30.

How do you define a route in Express.js?

app.get('/route', function(req, res){})

app.route('/route', function(req, res){})

router.get('/route', function(req, res){})

express.route('/route', function(req, res){})

None

31.

Which of the following is a NoSQL database?

MySQL

MongoDB

PostgreSQL

SQLite

None

32.

What is the default port for MongoDB?

3306

27017

5432

6379

None

33.

What is a component in React?

A reusable piece of UI

A JavaScript object

A CSS class

An HTTP request handler

None

34.

What is the purpose of props in React?

To manage state

To pass data between components

To configure routes

To style components

None

35.

How do you handle errors in Express.js?

By returning a 500 status code

By calling an external error handler

Using try-catch blocks only

Using error-handling middleware

None

36.

Which HTTP method is used to send data to the server to create a new resource?

DELETE

POST

GET

PUT

None

37.

How do you redirect a user to another page in Express.js?

res.send('/new-page')

res.route('/new-page')

res.redirect('/new-page')

app.redirect('/new-page')

None

38.

Which operator is used to update documents in MongoDB?

$update

$change

$modify

$set

None

39.

How does Node.js handle asynchronous I/O operations?

Using async/await.

Using child processes.

Using non-blocking I/O and event loop.

Using multithreading.

None

40.

What is JSX in React?

JavaScript Extension

A type of component

A state management library

A syntax extension for JavaScript

None

1 out of 8

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