MEAN Stack Quiz (Intermediate) - All Questions

This intermediate MEAN Stack quiz focuses on applied concepts such as REST APIs, Angular architecture, MongoDB queries, Express middleware, and Node.js internals. Ideal for developers with basic knowledge preparing for interviews and real-world MEAN stack projects.

Question 1: Which MEAN stack layer is responsible for handling REST APIs?

Angular
MongoDB
Express with Node.js
Browser

Explanation: Express and Node.js together handle REST APIs and business logic.

Question 2: What is the main role of Angular services?

UI styling
Data sharing and business logic
Routing only
DOM manipulation

Explanation: Services handle shared logic and data across components.

Question 3: Which HTTP status code represents forbidden access?

Explanation: 403 means the server understood the request but refuses access.

Question 4: Which MongoDB method updates multiple documents?

update()
updateOne()
updateMany()
replaceOne()

Explanation: updateMany() modifies multiple matching documents.

Question 5: Which Angular lifecycle hook is used for component initialization?

ngOnChanges
ngAfterViewInit
ngOnInit
ngOnDestroy

Explanation: ngOnInit runs after component initialization.

Question 6: What is middleware in Express.js?

Database connector
Request-response processing layer
UI renderer
Routing library

Explanation: Middleware processes requests before reaching routes.

Question 7: Which MongoDB feature improves query performance?

Collections
Indexes
Documents
Schemas

Explanation: Indexes significantly improve query performance.

Question 8: Which Angular feature avoids redundant API calls?

Pipes
Services
Directives
Modules

Explanation: Services can cache data and reuse API results.

Question 9: Which Node.js feature allows handling many requests efficiently?

Multithreading
Event loop
Worker threads
Promises

Explanation: The event loop enables non-blocking I/O.

Question 10: Which MongoDB aggregation stage filters documents?

$group
$sort
$project
$match

Explanation: $match filters documents based on conditions.

Question 11: Which Angular decorator defines a service?

@NgModule
@Component
@Injectable
@Directive

Explanation: @Injectable allows a class to be injected as a service.

Question 12: Which HTTP method is idempotent?

POST
PUT
PATCH
CONNECT

Explanation: PUT is idempotent by design.

Question 13: Which Express method handles all HTTP methods?

app.use()
app.get()
app.post()
app.all()

Explanation: app.all() handles all HTTP verbs.

Question 14: Which MongoDB operator adds values to arrays?

$set
$push
$add
$insert

Explanation: $push appends values to arrays.

Question 15: Which Angular feature enables route protection?

Services
Pipes
Route Guards
Modules

Explanation: Route Guards control navigation access.

Question 16: Which Node.js package loads environment variables?

env
dotenv
config
vars

Explanation: dotenv loads variables from .env files.

Question 17: Which MongoDB command removes a single document?

remove()
deleteOne()
drop()
clear()

Explanation: deleteOne() removes one document.

Question 18: Which Angular module is required for HTTP calls?

FormsModule
BrowserModule
HttpClientModule
RouterModule

Explanation: HttpClientModule enables HTTP communication.

Question 19: Which HTTP status code indicates successful creation?

Explanation: 201 indicates a resource was created successfully.

Question 20: Which Express middleware improves security headers?

cors
helmet
morgan
body-parser

Explanation: helmet adds secure HTTP headers.

Question 21: Which MongoDB relationship embeds related data?

Referenced
Embedded
Linked
Indexed

Explanation: Embedded documents store related data together.

Question 22: Which Angular feature enables lazy loading?

Components
Modules
Pipes
Services

Explanation: Lazy loading is implemented using Angular modules.

Question 23: Which Node.js object sends HTTP responses?

req
res
app
router

Explanation: res is used to send responses.

Question 24: Which MongoDB stage reshapes output fields?

$group
$sort
$project
$limit

Explanation: $project reshapes document fields.

Question 25: Which Angular feature helps share data globally?

Pipes
Services
Directives
Components

Explanation: Services provide shared global data.

Question 26: Which HTTP method partially updates a resource?

PUT
PATCH
POST
GET

Explanation: PATCH is used for partial updates.

Question 27: Which Express middleware parses JSON bodies?

body-parser
express.json()
jsonParser()
dataParser()

Explanation: express.json() parses incoming JSON payloads.

Question 28: Which MongoDB feature supports transactions?

Indexes
Collections
Replica sets
Documents

Explanation: Replica sets enable transactions.

Question 29: Which Angular lifecycle hook runs after view initialization?

ngOnInit
ngAfterViewInit
ngOnChanges
ngOnDestroy

Explanation: ngAfterViewInit runs after the view is initialized.

Question 30: Which Node.js practice avoids blocking the event loop?

Synchronous code
Callbacks only
Async operations
CPU-heavy tasks

Explanation: Async operations prevent blocking.

Question 31: Which MongoDB command sorts query results?

order()
sort()
group()
arrange()

Explanation: sort() orders query results.

Question 32: Which Angular feature formats template output?

Services
Directives
Pipes
Modules

Explanation: Pipes format data in templates.

Question 33: Which HTTP status code represents server error?

Explanation: 500 indicates internal server error.

Question 34: Which Express method starts the server?

app.start()
app.run()
app.listen()
app.open()

Explanation: app.listen() starts the HTTP server.

Question 35: Which Angular CLI command generates a service?

ng new service
ng add service
ng generate service
ng create service

Explanation: ng generate service creates a new service.

Question 36: Which MongoDB operator removes fields?

$unset
$delete
$remove
$clear

Explanation: $unset removes specified fields.

Question 37: Which Angular module is required for forms?

RouterModule
FormsModule
HttpClientModule
BrowserModule

Explanation: FormsModule supports template-driven forms.

Question 38: Which Node.js module handles file system operations?

http
fs
path
os

Explanation: fs handles file system operations.

Question 39: Which MongoDB feature enforces schema rules?

Indexes
Collections
Mongoose schemas
Documents

Explanation: Mongoose schemas enforce structure.

Question 40: Which Angular feature detects data changes?

Change Detection
Routing
DI system
Pipes

Explanation: Change Detection updates the UI.

Question 41: Which HTTP status code means bad request?

Explanation: 400 indicates a bad request.

Question 42: Which Express middleware enables CORS?

helmet
cors
morgan
cookie-parser

Explanation: cors enables cross-origin requests.

Question 43: Which Angular feature allows communication between unrelated components?

Pipes
Services with Observables
Directives
Modules

Explanation: Services with Observables enable component communication.

Question 44: Which MongoDB stage limits result count?

$skip
$limit
$sort
$count

Explanation: $limit restricts the number of results.

Question 45: Which Node.js object represents the application?

req
res
app
router

Explanation: app represents the Express application.

Question 46: Which Angular feature is used for dependency injection?

Modules
DI framework
Services
Routing

Explanation: Angular has a built-in DI framework.

Question 47: Which MongoDB command retrieves documents?

insert()
find()
update()
delete()

Explanation: find() retrieves documents.

Question 48: Which HTTP method retrieves data safely?

POST
PUT
GET
DELETE

Explanation: GET retrieves data without side effects.

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MEAN Stack Quiz (Intermediate)

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MEAN Stack Quiz (Intermediate)