Angular JS MCQs with answers Page - 24

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 difference between Subject and BehaviorSubject in RxJS?

  • (A) Subject requires an initial value, BehaviorSubject does not
  • (B) BehaviorSubject stores the latest value and emits it immediately to new subscribers
  • (C) Subject stores the latest value, BehaviorSubject does not
  • (D) There is no difference

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Q. How do you unsubscribe from an Observable in Angular?

  • (A) By calling unsubscribe() on the subscription
  • (B) By setting Observable to null
  • (C) Angular unsubscribes automatically for all Observables
  • (D) By using ngOnInit hook

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Q. What is the purpose of the `providers` array in @NgModule?

  • (A) To declare components
  • (B) To import modules
  • (C) To register services for dependency injection
  • (D) To configure routes

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

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

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Q. Which of the following is a structural directive?

  • (A) ngIf
  • (B) ngStyle
  • (C) ngClass
  • (D) ngModel

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Q. Which Angular decorator marks a class as a component?

  • (A) @Component
  • (B) @Injectable
  • (C) @Directive
  • (D) @NgModule

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Q. Which Angular CLI command generates a new service?

  • (A) ng generate service service-name
  • (B) ng create service service-name
  • (C) ng new service service-name
  • (D) ng add service service-name

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Q. Which change detection strategy checks only when the component’s inputs change?

  • (A) Default
  • (B) OnPush
  • (C) Manual
  • (D) Detached

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Q. Which Angular module is required for using reactive forms?

  • (A) FormsModule
  • (B) ReactiveFormsModule
  • (C) HttpClientModule
  • (D) RouterModule

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Q. Which method is used to get the current value of a FormControl?

  • (A) value
  • (B) getValue()
  • (C) currentValue()
  • (D) get()

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