Angular Quiz Test Online (30 random Questions) 2026

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 createSelector() in NgRx?

A) To optimize and retrieve specific pieces of state

B) To generate a new reducer

C) To modify an observable's behavior

D) To handle side effects in effects

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2. What is the use of patchValue() in Reactive forms?

A) Clears all form controls

B) Deletes form controls

C) Updates specific form controls

D) Updates all form controls

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

A) Executes the request and listens for a response

B) Sends an API request

C) Caches the response

D) Cancels the request

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4. What happens when a component is destroyed?

A) It only removes its template but keeps its logic in memory

B) It stops receiving input properties

C) It gets hidden but remains in memory

D) It is removed from the DOM and memory

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

A) It stores compiled TypeScript files

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

C) It holds Angular service files

D) It includes unit test cases

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6. What is Type Inference in TypeScript?

A) A debugging feature

B) Allowing TypeScript to automatically determine the type

C) Manually defining types for variables

D) A process for converting TypeScript to JavaScript

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

A) Defines project styles

B) Configures Angular modules

C) Contains HTML templates

D) Lists dependencies and scripts

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8. How do you add NgRx Store to an Angular app?

A) import { ReduxModule } from '@angular/platform-redux';

B) import { NgRxModule } from '@angular/core';

C) import { StateModule } from '@ngrx/ngrx';

D) import { StoreModule } from '@ngrx/store';

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9. What is the purpose of ViewChild in Angular?

A) To pass data from a child to a parent

B) To get a reference to a child component or DOM element

C) To define a component as a child of another

D) To create a new component dynamically

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10. Which Angular service is used to make HTTP calls?

A) ApiService

B) HttpService

C) HttpClient

D) Http

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11. What does ng lint do in Angular?

A) Fixes TypeScript errors

B) Checks code for best practices

C) Tests application performance

D) Deploys the application

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12. What Angular feature helps prevent CSRF attacks?

A) Angular Forms

B) CORS Headers

C) Content Projection

D) HTTP Interceptors

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13. What is the primary use of Angular services?

A) To manage application data and business logic

B) To create reusable components

C) To apply CSS styling

D) To define routes in the application

14 / 30

14. What is TypeScript?

A) A database query language

B) A superset of JavaScript that adds static typing

C) A JavaScript framework

D) A replacement for JavaScript

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15. How can you pass parameters in an Angular route?

A) { path: 'user:id', component: UserComponent }

B) { path: 'user/:id', component: UserComponent }

C) { path: 'user?', component: UserComponent }

D) { path: 'user/{id}', component: UserComponent }

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16. What is Lazy Loading in Angular?

A) A CSS technique for styling Angular components

B) A way to delay HTTP requests

C) A performance issue in Angular applications

D) A method to load only required modules on demand

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17. What does an HTTP interceptor do in Angular?

A) It logs user actions

B) It modifies HTTP requests and responses globally

C) It cancels API requests

D) It initializes API calls

18 / 30

18. What does OpenID Connect add to OAuth 2.0?

A) Encryption

B) Security

C) Authentication

D) Authorization

19 / 30

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

A) switchMap

B) filter

C) map

D) mergeMap

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20. Which method is used for programmatic navigation in Angular?

A) redirectTo()

B) navigate()

C) navigateTo()

D) goTo()

21 / 30

21. Where should authentication tokens be stored?

A) Session Storage

B) Cookies

C) HTTP Headers

D) Local Storage

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22. What is an alternative way to inject dependencies manually?

A) Using new MyService()

B) Using Injector.get(MyService)

C) By modifying the component template

D) Using import { MyService }

23 / 30

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

A) It makes API calls faster

B) It works without a backend

C) It supports observables and RxJS operators

D) It removes the need for servers

24 / 30

24. Which lifecycle hook is useful for initializing form data in a component?

A) ngAfterViewInit

B) ngDoCheck

C) ngOnChanges

D) ngOnInit

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25. What is the purpose of the pathMatch: 'full' property in a route?

A) It redirects the user to an external URL

B) It activates lazy loading

C) It enables child routes

D) It ensures only exact matches are used for navigation

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

A) It is responsible for component styling

B) It contains project configuration settings

C) It manages backend API calls

D) It defines project dependencies

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27. What does @ViewChild() do in Angular?

A) Passes data from a parent component to a child component

B) Allows a component to access a child component or DOM element

C) Manages event listeners in the DOM

D) Creates a new child component dynamically

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28. Which route guard is used to prevent unauthorized access to routes?

A) CanDeactivate

B) CanLoad

C) CanActivate

D) Resolve

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29. What is the purpose of Angular Modules (NgModule)?

A) To manage HTTP requests

B) To create services

C) To define Angular components and dependencies

D) To style an Angular application

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30. What is the purpose of polyfills.ts in an Angular project?

A) It defines API endpoints

B) It is used for database connectivity

C) It handles Angular animations

D) It provides compatibility with older browsers

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