Angular JS MCQs with answers Page - 7

Here, you will find a collection of MCQ questions on Angular JS. Go through these questions to enhance your preparation for upcoming examinations and interviews.

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Q. Which Angular feature allows form fields to be added or removed dynamically?

  • (A) FormControl
  • (B) FormGroup
  • (C) FormArray
  • (D) FormBuilder

A

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Q. Which lifecycle hook is called after the component’s view has been fully initialized?

  • (A) ngAfterViewInit
  • (B) ngAfterContentInit
  • (C) ngOnInit
  • (D) ngDoCheck

A

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Q. Which Angular version introduced Standalone Components?

  • (A) Angular 10
  • (B) Angular 13
  • (C) Angular 14
  • (D) Angular 15

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Q. What is the default scope of Angular services provided in a component?

  • (A) Application-wide
  • (B) Module-wide
  • (C) Component-only
  • (D) Global

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Q. What is the purpose of 'providedIn: root' in a service?

  • (A) To limit the service to a module
  • (B) To make the service available application-wide
  • (C) To disable service injection
  • (D) To provide service only in root component

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Q. How do you bind a CSS class conditionally in Angular?

  • (A) [class.active]='isActive'
  • (B) class='isActive ? active : inactive'
  • (C) [active]='isActive'
  • (D) *ngClass='isActive'

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Q. What is the main purpose of ChangeDetectorRef in Angular?

  • (A) To inject services
  • (B) To detect route changes
  • (C) To trigger manual change detection
  • (D) To initialize a form

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Q. What happens when a component is destroyed in Angular?

  • (A) View is hidden but logic continues
  • (B) ngOnDestroy is called and subscriptions should be cleaned up
  • (C) Nothing happens by default
  • (D) Only the DOM is cleared

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Q. How can you prevent memory leaks in Angular when using Observables?

  • (A) Using setInterval
  • (B) Using HttpClient
  • (C) Unsubscribing in ngOnDestroy
  • (D) Calling next() manually

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Q. Which decorator is used to pass data from parent to child component?

  • (A) @Inject
  • (B) @Input
  • (C) @Output
  • (D) @HostListener

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