Advanced Angular MCQs with answers Page - 2

You will find multiple-choice questions (MCQs) related to #Advanced Angular here. Go through these questions to prepare effectively for your upcoming exams and interviews.

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Q. What does providedIn: 'root' do?

  • (A) Creates multiple service instances
  • (B) Provides service at component level
  • (C) Registers service as singleton at root level
  • (D) Disables DI

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Q. Which lifecycle hook is used to clean up subscriptions?

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

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Q. Which directive is used to dynamically load templates?

  • (A) ngTemplateOutlet
  • (B) ngContent
  • (C) ngSwitch
  • (D) ngIf

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Q. What is the main benefit of standalone components?

  • (A) Require more modules
  • (B) Reduce boilerplate code
  • (C) Disable routing
  • (D) Increase app size

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Q. Which operator is best for sequential HTTP calls?

  • (A) mergeMap
  • (B) switchMap
  • (C) concatMap
  • (D) forkJoin

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Q. What does trackBy function improve in *ngFor?

  • (A) Security
  • (B) Rendering performance
  • (C) Routing
  • (D) Form validation

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Q. Which Angular feature replaces constructor injection in functional APIs?

  • (A) inject()
  • (B) useFactory
  • (C) providers array
  • (D) useClass

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Q. What is the purpose of HttpInterceptor?

  • (A) Routing control
  • (B) Global request/response handling
  • (C) State management
  • (D) Template rendering

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Q. Which Angular feature allows signals-based reactivity?

  • (A) RxJS Subjects
  • (B) Zone.js
  • (C) Angular Signals
  • (D) ChangeDetectorRef

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Q. What does ChangeDetectorRef.detach() do?

  • (A) Destroys the component
  • (B) Stops change detection for the component
  • (C) Refreshes the view
  • (D) Triggers routing

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