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 PurgeCSS used for in Angular?

A) Optimizing JavaScript

B) Improving accessibility

C) Removing unused CSS

D) Debugging

2 / 30

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

A) Disables all validations

B) Updates the form value and revalidates it

C) Resets the form to its default state

D) Clears all form errors

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3. What is the main benefit of OnPush change detection strategy?

A) It disables change detection

B) It allows direct DOM manipulation

C) It improves performance by reducing unnecessary checks

D) It runs change detection continuously

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4. How do you enable strict type checking in TypeScript?

A) By setting "strict": true in tsconfig.json

B) Both A and B

C) TypeScript does not support strict checking

D) By using the --strict flag when compiling

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5. What are the two types of forms in Angular?

A) Angular Forms and HTML Forms

B) Template-driven and Reactive Forms

C) Static and Dynamic Forms

D) Model-based and View-based Forms

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6. What is a common CDN used to deploy Angular applications?

A) Webpack

B) Firebase

C) Bootstrap

D) Cloudflare

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

A) Logs request details

B) Runs a function after the request completes

C) Cancels an API request

D) Hides errors from the console

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

A) It is responsible for routing

B) It contains Angular application logic

C) It defines TypeScript configurations

D) It acts as the main template for the application

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

A) Lists dependencies and scripts

B) Contains HTML templates

C) Configures Angular modules

D) Defines project styles

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

A) INVALID

B) NULL

C) PENDING

D) VALID

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11. Which module is required to work with forms in Angular?

A) CommonModule

B) ReactiveFormsModule

C) Both A and B

D) FormsModule

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

A) @angular/common

B) @angular/router

C) @angular/core

D) @angular/forms

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

A) Creates a new child component dynamically

B) Manages event listeners in the DOM

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

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

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14. How do you select data from the NgRx store?

A) Using store.reduce()

B) Using store.dispatch()

C) Using store.select()

D) Using store.getState()

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15. What is the purpose of the selector property in a component?

A) To define the name of the component class

B) To bind the component to a module

C) To set component styles

D) To specify how the component is referenced in templates

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

A) Using JWT with an authentication service

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

C) Hardcoding usernames and passwords

D) Using local storage to store user credentials

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17. Which lifecycle hook is used for cleanup operations?

A) ngOnChanges()

B) ngOnDestroy()

C) ngAfterViewInit()

D) ngOnInit()

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18. What is the purpose of ngAfterViewInit() lifecycle hook?

A) It runs after the component's view has been initialized

B) It checks for data changes

C) It initializes the component

D) It executes before the component is destroyed

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19. What is the best way to handle errors in a deployed Angular app?

A) Logging errors in the console

B) Disabling error messages

C) Restarting the server

D) Using a global error handler

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

A) It provides compatibility with older browsers

B) It handles Angular animations

C) It is used for database connectivity

D) It defines API endpoints

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21. How do you get the value of a form control in Reactive forms?

A) formControl.returnValue()

B) formControl.value

C) formControl.getValue()

D) formControl.fetch()

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

A) HttpClient

B) Http

C) HttpService

D) ApiService

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

A) formControl.invalid

B) formControl.valid

C) formControl.status

D) formControl.validState

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25. Which of the following is NOT a valid way to share data between Angular components?

A) Using @Output()

B) Using a shared service

C) Using local storage

D) Using @Input()

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26. How do you set global headers for every HTTP request?

A) Using HttpHeaders.setGlobal()

B) Setting headers in every HttpClient request

C) Using an HttpInterceptor

D) Using a config file

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27. What is the key advantage of using the NgRx store over Angular services?

A) It directly modifies the DOM

B) It offers centralized state management

C) It eliminates the need for HTTP requests

D) It prevents the use of observables

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28. How do you transform an API response before using it?

A) Using concatMap()

B) Using delay()

C) Using map() in RxJS

D) Using filter()

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29. What is a module in Angular?

A) A single JavaScript file

B) A CSS styling framework

C) A collection of components and services

D) A function that executes background tasks

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30. What is the purpose of createSelector() in NgRx?

A) To modify an observable's behavior

B) To optimize and retrieve specific pieces of state

C) To generate a new reducer

D) To handle side effects in effects

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