Angular JS MCQs with answers Page - 5

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 Angular concept allows a component to be used without being declared in a module?

  • (A) Dynamic component
  • (B) Standalone component
  • (C) Lazy-loaded component
  • (D) Global component

A

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Q. Which RxJS operator is used to transform emitted items from an observable?

  • (A) catchError
  • (B) map
  • (C) filter
  • (D) tap

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Q. What is the purpose of a Resolver in Angular routing?

  • (A) To restrict access to routes
  • (B) To fetch data before route activation
  • (C) To log route changes
  • (D) To handle errors in routing

A

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Q. Which method is used to register a route guard in Angular?

  • (A) canActivate
  • (B) registerGuard
  • (C) useGuard
  • (D) setRouteGuard

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Q. Which directive is used to apply dynamic styles in Angular?

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

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Q. What is the role of the 'trackBy' function in *ngFor?

  • (A) To filter items
  • (B) To style items
  • (C) To improve performance by tracking item identity
  • (D) To prevent rendering

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Q. What is the default ChangeDetectionStrategy in Angular?

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

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Q. What is used to perform unit testing in Angular?

  • (A) Karma and Jasmine
  • (B) Mocha and Chai
  • (C) Jest and Enzyme
  • (D) QUnit and Sinon

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Q. Which keyword is used for dependency injection in a constructor?

  • (A) inject
  • (B) import
  • (C) private/public/protected
  • (D) new

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Q. What does Angular use internally for reactivity and asynchronous programming?

  • (A) Promises
  • (B) Observables
  • (C) Callbacks
  • (D) async/await

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