Angular MCQs with answers Page - 97

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📊 Angular
Q. Which lifecycle hook runs after every change detection cycle?
  • (A) ngOnInit
  • (B) ngAfterViewInit
  • (C) ngDoCheck
  • (D) ngOnDestroy
💬 Discuss
✅ Correct Answer: (C) ngDoCheck

Explanation: ngDoCheck runs during every change detection cycle.

📊 Angular
Q. Which RxJS operator combines multiple observables and emits once all complete?
  • (A) combineLatest
  • (B) merge
  • (C) forkJoin
  • (D) zip
💬 Discuss
✅ Correct Answer: (C) forkJoin

Explanation: forkJoin emits once when all observables complete.

📊 Angular
Q. What does ViewChild return by default?
  • (A) Component instance only
  • (B) ElementRef or component/directive instance
  • (C) HTML string
  • (D) Observable
💬 Discuss
✅ Correct Answer: (B) ElementRef or component/directive instance

Explanation: @ViewChild provides access to DOM element or component.

📊 Angular
Q. Which Angular form type is immutable?
  • (A) Template-driven forms
  • (B) Reactive forms
  • (C) Hybrid forms
  • (D) Dynamic forms
💬 Discuss
✅ Correct Answer: (B) Reactive forms

Explanation: Reactive forms use immutable data structures.

📊 Angular
Q. Which directive allows projecting external content?
  • (A) ngTemplateOutlet
  • (B) ngIf
  • (C) ngContent
  • (D) ngSwitch
💬 Discuss
✅ Correct Answer: (C) ngContent

Explanation: ngContent is used for content projection.

📊 Angular
Q. Which Angular API enables manual change detection?
  • (A) ApplicationRef
  • (B) ChangeDetectorRef
  • (C) NgZone
  • (D) Injector
💬 Discuss
✅ Correct Answer: (B) ChangeDetectorRef

Explanation: ChangeDetectorRef provides methods to control change detection.

📊 Angular
Q. Which guard is used to prevent navigation away from a route?
  • (A) CanActivate
  • (B) CanLoad
  • (C) CanDeactivate
  • (D) Resolve
💬 Discuss
✅ Correct Answer: (C) CanDeactivate

Explanation: CanDeactivate stops navigation if conditions fail.

📊 Angular
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
💬 Discuss
✅ Correct Answer: (A) Improves performance by skipping change detection

Explanation: runOutsideAngular avoids triggering change detection.

📊 Angular
Q. Which operator shares a single subscription among multiple subscribers?
  • (A) map
  • (B) shareReplay
  • (C) filter
  • (D) delay
💬 Discuss
✅ Correct Answer: (B) shareReplay

Explanation: shareReplay shares and replays emitted values.

📊 Angular
Q. Which Angular testing utility creates a test environment?
  • (A) TestBed
  • (B) Jasmine
  • (C) Karma
  • (D) Protractor
💬 Discuss
✅ Correct Answer: (A) TestBed

Explanation: TestBed configures the Angular testing module.

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