Angular Quiz Test Online (30 random Questions) 2025

This quick 30-minute challenge consists of 30 random multiple-choice questions designed to test your knowledge across various Angular topics, including the introduction to Angular, TypeScript basics, project structure and fundamentals, components and communication, services and dependency injection, routing and navigation, forms in Angular, HTTP and API integration, state management with RxJS and NgRx, as well as authentication and security practices. Whether you’re just starting or looking to deepen your expertise, this quiz will enhance your understanding of Angular’s framework and best practices.

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30 Minutes Angular Quiz Test Online

Welcome to the Angular Quiz! This quick 30-minute challenge consists of 30 random multiple-choice questions designed to test your knowledge across various Angular topics, including the introduction to Angular, TypeScript basics, project structure and fundamentals, components and communication, services and dependency injection, routing and navigation, forms in Angular, HTTP and API integration, state management with RxJS and NgRx, as well as authentication and security practices. Whether you're just starting or looking to deepen your expertise, this quiz will enhance your understanding of Angular's framework and best practices.

1 / 30

1. How do you disable a form control in Reactive forms?

A) control.deactivate()

B) control.setDisabled(true)

C) control.readOnly(true)

D) control.disable()

2 / 30

2. How can Angular optimize images for deployment?

A) Lazy loading images

B) All of the above

C) Compressing images

D) Using WebP format

3 / 30

3. What is the purpose of the index.html file in an Angular project?

A) It contains Angular application logic

B) It acts as the main template for the application

C) It defines TypeScript configurations

D) It is responsible for routing

4 / 30

4. What Angular feature helps prevent CSRF attacks?

A) HTTP Interceptors

B) Angular Forms

C) Content Projection

D) CORS Headers

5 / 30

5. What is the main purpose of an Angular module?

A) To store API response data

B) To group related components, directives, and services

C) To manage component lifecycles

D) To define global CSS styles

6 / 30

6. What Angular feature helps improve performance by removing unused code?

A) Minification

B) AOT Compilation

C) Tree Shaking

D) Lazy Loading

7 / 30

7. What is OAuth 2.0 in Angular authentication?

A) A CSS framework for styling Angular applications

B) A debugging tool for Angular components

C) A token-based authentication framework

D) A frontend library for animations

8 / 30

8. What are NgRx actions?

A) A function that filters observables

B) A way to trigger state changes

C) UI components for animations

D) A replacement for services

9 / 30

9. Which module must be imported to enable routing in Angular?

A) @angular/router

B) @angular/common

C) @angular/core

D) @angular/forms

10 / 30

10. What does the .subscribe() method do in an HTTP request?

A) Executes the request and listens for a response

B) Caches the response

C) Cancels the request

D) Sends an API request

11 / 30

11. Which Angular CLI command compiles the project into a dist/ folder?

A) ng build

B) ng generate

C) ng serve

D) ng compile

12 / 30

12. What is the role of asyncValidators in Angular forms?

A) They disable validation temporarily

B) They perform synchronous validation

C) They perform asynchronous validation, like checking unique usernames

D) They reset the form

13 / 30

13. What is an Angular Injector?

A) A tool to create components

B) A system that maintains dependencies and injects them where needed

C) A method to call services

D) A built-in function to modify services

14 / 30

14. Which decorator is used to define an Angular component?

A) Injectable

B) Directive

C) Component

D) Service

15 / 30

15. What does touched mean in Angular forms?

A) The form has been submitted

B) The field has been modified

C) The field is empty

D) The user has clicked inside the field

16 / 30

16. Which module is required to make HTTP requests in Angular?

A) FormsModule

B) HttpClientModule

C) CommonModule

D) HttpModule

17 / 30

17. What does the ng deploy command do in Angular?

A) Installs dependencies

B) Checks for outdated packages

C) Runs the application locally

D) Builds and deploys the app to a hosting service

18 / 30

18. What is lazy loading in Angular routing?

A) Loading components only when needed

B) Loading routes based on user permissions

C) Caching API responses

D) Loading JavaScript files dynamically

19 / 30

19. What happens if a service is provided in both root and a module?

A) It affects all other services

B) Angular throws an error

C) A new instance is created for the module

D) The global instance is used

20 / 30

20. What does the finalize() operator do in an HTTP request?

A) Hides errors from the console

B) Logs request details

C) Runs a function after the request completes

D) Cancels an API request

21 / 30

21. What encryption technique is recommended for storing passwords?

A) Plain text

B) Hashing with bcrypt

C) Base64 Encoding

D) URL Encoding

22 / 30

22. What are the three main parts of an Angular component?

A) HTML, CSS, JavaScript

B) Template, Class, Styles

C) Module, Directive, Pipe

D) Service, Module, Component

23 / 30

23. What is the default way to pass data from a parent to a child component in Angular?

A) Using @Output decorator

B) Using @Input decorator

C) Using a service

D) Using local storage

24 / 30

24. What is the main file responsible for bootstrapping an Angular application?

A) index.html

B) main.ts

C) app.module.ts

D) angular.json

25 / 30

25. What is the purpose of the assets/ folder in an Angular project?

A) It contains static resources like images, fonts, and JSON files

B) It includes unit test cases

C) It holds Angular service files

D) It stores compiled TypeScript files

26 / 30

26. What Angular feature is used to automatically attach authentication headers to HTTP requests?

A) Services

B) Directives

C) Route Guards

D) HTTP Interceptors

27 / 30

27. Which RxJS operator is commonly used to handle API responses?

A) map

B) filter

C) mergeMap

D) switchMap

28 / 30

28. What is the singleton pattern in Angular services?

A) Creating an instance of a service for each component

B) Preventing dependency injection

C) Limiting a service to one instance across the application

D) Ensuring multiple instances of a service exist

29 / 30

29. What is the main advantage of using Angular HTTPClient?

A) It makes API calls faster

B) It supports observables and RxJS operators

C) It works without a backend

D) It removes the need for servers

30 / 30

30. What is the default value of status in a newly created form?

A) INVALID

B) PENDING

C) NULL

D) VALID

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