Angular JS MCQs with answers Page - 99

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 strategy allows preloading lazy-loaded modules?

  • (A) NoPreloading
  • (B) PreloadAllModules
  • (C) EagerLoading
  • (D) LoadOnDemand

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Q. What is a pure pipe?

  • (A) Always recalculates
  • (B) Executes only when input changes
  • (C) Used only for numbers
  • (D) Executes every change detection

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Q. Which Angular feature helps in reducing bundle size?

  • (A) NgModules
  • (B) Lazy loading
  • (C) Two-way binding
  • (D) Event binding

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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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