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.

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1. What is the purpose of the RouterOutlet directive?

A) To bind form inputs

B) To act as a placeholder where routed components are dynamically loaded

C) To define the structure of an Angular component

D) To display the navigation menu

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

A) They perform synchronous validation

B) They perform asynchronous validation, like checking unique usernames

C) They disable validation temporarily

D) They reset the form

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3. What is PurgeCSS used for in Angular?

A) Debugging

B) Improving accessibility

C) Removing unused CSS

D) Optimizing JavaScript

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4. What does updateValueAndValidity() do in Angular forms?

A) Clears all form errors

B) Disables all validations

C) Resets the form to its default state

D) Updates the form value and revalidates it

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5. What is an Angular component?

A) A module that controls application routing

B) A JavaScript function used to manipulate the DOM

C) A UI building block with an HTML template, TypeScript class, and CSS styles

D) A predefined service in Angular

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6. Where should authentication tokens be stored?

A) Cookies

B) Session Storage

C) Local Storage

D) HTTP Headers

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7. What does ng lint do in Angular?

A) Fixes TypeScript errors

B) Tests application performance

C) Checks code for best practices

D) Deploys the application

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8. What is take(1) used for in Angular HTTP requests?

A) To increase API performance

B) To retry the request if it fails

C) To add a delay before execution

D) To take the first API response and unsubscribe automatically

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9. Which Angular lifecycle hook is best for making API calls?

A) ngOnDestroy()

B) ngOnInit()

C) ngDoCheck()

D) ngAfterViewInit()

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

A) It makes API calls faster

B) It removes the need for servers

C) It works without a backend

D) It supports observables and RxJS operators

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11. What is the purpose of the angular.json file?

A) It defines project dependencies

B) It contains project configuration settings

C) It manages backend API calls

D) It is responsible for component styling

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12. Which language is primarily used in Angular development?

A) PHP

B) TypeScript

C) Python

D) JavaScript

13 / 30

13. What is Lazy Loading in Angular?

A) A way to delay HTTP requests

B) A performance issue in Angular applications

C) A CSS technique for styling Angular components

D) A method to load only required modules on demand

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14. Which Angular feature helps reduce the initial JavaScript bundle size?

A) Minification

B) Service Workers

C) Lazy Loading

D) Webpack

15 / 30

15. What is OAuth 2.0 in Angular authentication?

A) A debugging tool for Angular components

B) A frontend library for animations

C) A CSS framework for styling Angular applications

D) A token-based authentication framework

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16. What is the purpose of the app-routing.module.ts file?

A) It sets up the database connection

B) It initializes the Angular application

C) It defines routes for navigation

D) It contains component logic

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

A) @angular/router

B) @angular/common

C) @angular/core

D) @angular/forms

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18. What does { providedIn: 'root' } do in a service?

A) Makes the service available globally

B) Forces Angular to create multiple instances

C) Prevents dependency injection

D) Limits the service to one module

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19. What is the purpose of RouterModule in Angular?

A) To manage component styles

B) To handle application routing

C) To store application data

D) To communicate with backend servers

20 / 30

20. Which module system does TypeScript use by default?

A) UMD

B) CommonJS

C) ES6 Modules

D) AMD

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21. How can you send JSON data in a POST request in Angular?

A) { body: JSON.stringify(data) }

B) { headers: 'application/json' }

C) { headers: { 'Content-Type': 'application/json' } }

D) { contentType: 'json' }

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22. How can a service be limited to a specific module?

A) Declaring it inside main.ts

B) Using @Component({ providers: [MyService] })

C) Using { providedIn: 'root' }

D) Adding it in providers array of a module

23 / 30

23. What is the best way to handle authentication in an Angular application?

A) Hardcoding usernames and passwords

B) Allowing users to bypass login if they refresh the page

C) Using local storage to store user credentials

D) Using JWT with an authentication service

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24. What is the purpose of formArray in Reactive forms?

A) To store error messages

B) To validate email fields

C) To handle dynamic form controls

D) To reset the form

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25. Where should services be provided in Angular?

A) Only in components

B) In main.ts

C) In @NgModule or @Component using providedIn

D) Only in app.module.ts

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26. What is the primary function of the package.json file in an Angular project?

A) Configures Angular modules

B) Defines project styles

C) Contains HTML templates

D) Lists dependencies and scripts

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

A) VALID

B) NULL

C) PENDING

D) INVALID

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28. How do you check if a form control is valid?

A) formControl.validState

B) formControl.status

C) formControl.invalid

D) formControl.valid

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

A) control.setDisabled(true)

B) control.readOnly(true)

C) control.disable()

D) control.deactivate()

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30. How do you navigate back to the previous page using Angular Router?

A) this.router.goBack()

B) this.location.back()

C) this.router.navigateBack()

D) this.router.previous()

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