Angular JS MCQs with answers Page - 101

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. What is the purpose of NgZone.runOutsideAngular()?

  • (A) Improves performance by skipping change detection
  • (B) Disables routing
  • (C) Triggers change detection
  • (D) Stops HTTP calls

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Q. Which operator shares a single subscription among multiple subscribers?

  • (A) map
  • (B) shareReplay
  • (C) filter
  • (D) delay

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Q. Which Angular testing utility creates a test environment?

  • (A) TestBed
  • (B) Jasmine
  • (C) Karma
  • (D) Protractor

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Q. What does the inject() function replace?

  • (A) NgModule
  • (B) Constructor-based dependency injection
  • (C) Services
  • (D) Providers

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Q. Which Angular feature enables hydration in SSR?

  • (A) Zone.js
  • (B) TransferState
  • (C) NgModule
  • (D) HttpClient

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Q. What does the router-outlet directive do?

  • (A) Loads services
  • (B) Acts as placeholder for routed views
  • (C) Handles guards
  • (D) Preloads modules

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Q. Which lifecycle hook is called when an input property changes?

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

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Q. Which operator is used to handle errors in RxJS?

  • (A) catchError
  • (B) throwError
  • (C) retry
  • (D) finalize

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Q. Which Angular feature supports tree shaking?

  • (A) NgModules
  • (B) providedIn
  • (C) Two-way binding
  • (D) Event emitters

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Q. Which API is used to dynamically create components?

  • (A) ComponentFactoryResolver
  • (B) Renderer2
  • (C) ViewEncapsulation
  • (D) TemplateRef

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