Angular Quiz - MCQ - Multiple Choice Questions

Welcome to Angular Quiz for beginners! Testing your knowledge is a great way to solidify what you've learned. 

This quiz is designed to help beginners test their understanding of core Angular concepts. From modules and components to data binding and services, these 30 multiple-choice questions cover the basics you need to know. Each question is followed by an answer and a concise explanation.

1. Angular is primarily considered as?

A. A JavaScript Framework

B. A CSS Framework

C. A content management system

D. A database system

Answer:

A. A JavaScript Framework

Explanation:

Angular is a platform and framework for building client-side applications with HTML and TypeScript.

2. Which command is used to create a new Angular project?

A. npm create angular-app

B. ng new project-name

C. angular init project-name

D. npm start angular

Answer:

B. ng new project-name

Explanation:

The Angular CLI ng new command creates a new workspace and a new app project.

3. Which of the following is a core component in an Angular application?

A. ViewController

B. Directive

C. Activity

D. Observer

Answer:

B. Directive

Explanation:

Directives are a core component in Angular. They add behavior to an existing DOM element or an existing component instance.

4. How do you bind data to an attribute in Angular?

A. {{variable}}

B. (variable)

C. [variable]

D. =variable=

Answer:

C. [variable]

Explanation:

In Angular, [variable] is used for property binding, binding data from the component to a specified attribute.

5. Which Angular decorator is used to listen to DOM events?

A. @Output()

B. @Input()

C. @Event()

D. @HostListener()

Answer:

D. @HostListener()

Explanation:

The @HostListener() decorator allows you to listen to events of the DOM element that hosts an attribute directive.

6. Which directive is used in Angular to add/remove an HTML element from the DOM based on a condition?

A. *ngFor

B. *ngSelect

C. *ngSwitch

D. *ngIf

Answer:

D. *ngIf

Explanation:

The *ngIf directive is used in Angular to conditionally add or remove an element from the DOM.

7. How can you fetch data from a server or database in Angular?

A. Using the HTTPModule

B. Using the FetchAPI

C. Using the ServerModule

D. Using the DatabaseModule

Answer:

A. Using the HTTPModule

Explanation:

In Angular, the HTTPModule provides tools for working with HTTP, allowing you to fetch or save data.

8. What does a pipe do in Angular?

A. Connects two components

B. Transforms data in the template

C. Merges streams of data

D. Opens a direct connection to the server

Answer:

B. Transforms data in the template

Explanation:

Pipes in Angular allow you to transform data for display in templates. For instance, formatting dates, currency, or text filtering.

9. Which decorator allows communication from a child component to its parent?

A. @Input()

B. @Output()

C. @ViewChild()

D. @Connect()

Answer:

B. @Output()

Explanation:

The @Output() decorator in Angular is used to emit custom events from child components, which the parent component can then respond to.

10. In which lifecycle hook is it recommended to send HTTP requests in an Angular component?

A. constructor

B. ngOnInit

C. ngOnDestroy

D. ngAfterViewInit

Answer:

B. ngOnInit

Explanation:

It's recommended to send HTTP requests in the ngOnInit lifecycle hook in Angular. The constructor should ideally be used only for simple initializations.

11. What purpose does the ngModel directive serve?

A. Handling HTTP requests

B. Data binding for both input and output

C. Listening to DOM events

D. Controlling animation

Answer:

B. Data binding for both input and output

Explanation:

ngModel is used for two-way data binding in Angular, which means it can bind the model (component's property) to a form field and vice-versa.

12. How can you generate a new service using Angular CLI?

A. ng create service my-service

B. ng generate service my-service

C. ng new service my-service

D. ng add service my-service

Answer:

B. ng generate service my-service

Explanation:

Using the Angular CLI, the ng generate service (or its shorthand ng g s) command helps in creating a new service.

13. What is the use of Angular Directives?

A. To inject services

B. To initialize component state

C. To manipulate the DOM elements

D. To store data

Answer:

C. To manipulate the DOM elements

Explanation:

Directives in Angular are used to manipulate or extend the behavior of DOM elements.

14. Which Angular decorator is used for making a class a root module?

A. @Module()

B. @Component()

C. @Directive()

D. @NgModule()

Answer:

D. @NgModule()

Explanation:

The @NgModule() decorator in Angular is used to define a module, and every Angular app has at least one root module.

15. Which is the correct syntax for an Angular Event binding?

A. {click}="doSomething()"

B. on-click="doSomething()"

C. (click)="doSomething()"

D. click[]="doSomething()"

Answer:

C. (click)="doSomething()"

Explanation:

In Angular, the syntax (eventName)="methodName()" is used for event binding.

16. Which command is used to install Angular CLI globally?

A. npm install @angular/cli

B. npm global install @angular/cli

C. npm install -g @angular/cli

D. npm --install @angular/cli

Answer:

C. npm install -g @angular/cli

Explanation:

The -g flag in the command is used to install the package globally.

17. How do you define a route in Angular?

A. Using <a> tags

B. Using the Router service

C. Using the Routes array

D. Using the @Route() decorator

Answer:

C. Using the Routes array

Explanation:

In Angular, routes are typically defined using a constant array of type Routes.

18. What's the primary purpose of the ngOnInit lifecycle hook in Angular components?

A. Initialization and data retrieval

B. Destruction of instances

C. Manipulation of the view's DOM

D. Handling of user input

Answer:

A. Initialization and data retrieval

Explanation:

ngOnInit is a component lifecycle hook that Angular calls shortly after creating the component. It's a good place to put initialization logic and data retrieval.

19. Which decorator allows you to define styles for a component?

A. @Style()

B. @ViewStyle()

C. @ComponentStyle()

D. @Component({styles: ...})

Answer:

D. @Component({styles: ...})

Explanation:

Inside the @Component decorator, you can define the styles for a component using the styles or styleUrls property.

20. What is the main difference between constructor and ngOnInit in Angular?

A. They serve the same purpose

B. constructor is used for initialization, while ngOnInit is used for destruction

C. constructor is used for dependency injection, while ngOnInit is used for initialization logic

D. ngOnInit is used for dependency injection, while the constructor is used for initialization logic

Answer:

C. constructor is used for dependency injection, while ngOnInit is used for initialization logic

Explanation:

While both the constructor and ngOnInit can be used for initialization, by convention, the constructor is used mainly for dependency injection and ngOnInit is used for initialization logic.

21. What is the purpose of the async pipe in Angular?

A. To make asynchronous HTTP requests

B. To automatically unsubscribe from observables or promises

C. To pause the execution of the application

D. To run change detection asynchronously

Answer:

B. To automatically unsubscribe from observables or promises

Explanation:

The async pipe subscribes to an Observable or Promise and returns the latest value it has emitted. When a new value is emitted, the async pipe marks the component to be checked for changes. It also automatically unsubscribes from the observable to reduce the risk of memory leaks.

22. Which directive is used in Angular to loop through an array or object?

A. ngFor

B. ngIf

C. ngSwitch

D. ngWhile

Answer:

A. ngFor

Explanation:

The ngFor directive is a structural directive in Angular, and it's used for rendering a list by iterating over an array or object.

23. What is the primary purpose of NgModules in Angular?

A. Error handling

B. Two-way data binding

C. To group together components, directives, and services that are related

D. To enhance performance

Answer:

C. To group together components, directives, and services that are related

Explanation:

NgModules are used in Angular to group together components, directives, pipes, and services that are related, and organize them in sets.

24. How can you bind to an input box value in Angular?

A. Using ngValue

B. Using ngBind

C. Using [(value)]

D. Using [(ngModel)]

Answer:

D. Using [(ngModel)]

Explanation:

In Angular, you can bind to an input box value using the [(ngModel)] two-way data binding syntax.

25. In Angular, which directive is used to apply styles conditionally?

A. ngStyle

B. ngClass

C. ngIf

D. ngApply

Answer:

A. ngStyle

Explanation:

The ngStyle directive in Angular is used to apply styles to an element dynamically/conditionally based on some condition.

26. Which decorator is used to listen to host events in an Angular directive?

A. @EventListener

B. @HostBinding

C. @HostListener

D. @Listen

Answer:

C. @HostListener

Explanation:

In Angular, the @HostListener decorator allows you to listen to the events of the host element in a directive.

27. How do you fetch data from a server or API in Angular?

A. Using the XMLHttpRequest object

B. Using the HttpClient module

C. Using the fetchData method

D. Using the AjaxModule

Answer:

B. Using the HttpClient module

Explanation:

In Angular, the HttpClient module provides a simplified API for HTTP functionality for use with Angular applications, including fetching data from a server or API.

28. What decorator is used to create a service in Angular?

A. @Directive

B. @Component

C. @Injectable

D. @Service

Answer:

C. @Injectable

Explanation:

The @Injectable decorator is used in Angular to denote a service, which can be injected into components and other services.

29. Which module in Angular includes basic directives like ngIf and ngFor?

A. BrowserModule

B. FormsModule

C. AppModule

D. CommonModule

Answer:

D. CommonModule

Explanation:

The CommonModule in Angular includes basic directives like ngIf and ngFor.

30. Which decorator in Angular is used to get data from a parent component?

A. @Input

B. @Output

C. @ViewChild

D. @GetData

Answer:

A. @Input

Explanation:

The @Input decorator in Angular is used to bind a property within one component (child) to receive a value from another component (parent).