Angular MCQs with answers Page - 5

Dear candidates you will find MCQ questions of Angular here. Learn these questions and prepare yourself for coming examinations and interviews. You can check the right answer of any question by clicking on any option or by clicking view answer button.
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📊 Angular
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
💬 Discuss
✅ Correct Answer: (B) Standalone component

Explanation: Standalone components can be used without being declared in an NgModule.

📊 Angular
Q. Which RxJS operator is used to transform emitted items from an observable?
  • (A) catchError
  • (B) map
  • (C) filter
  • (D) tap
💬 Discuss
✅ Correct Answer: (B) map

Explanation: The `map` operator transforms the emitted items of an Observable.

📊 Angular
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
💬 Discuss
✅ Correct Answer: (B) To fetch data before route activation

Explanation: Resolvers pre-fetch data required for a route before the route activates.

📊 Angular
Q. Which method is used to register a route guard in Angular?
  • (A) canActivate
  • (B) registerGuard
  • (C) useGuard
  • (D) setRouteGuard
💬 Discuss
✅ Correct Answer: (A) canActivate

Explanation: `canActivate` is used to control access to routes using guards.

📊 Angular
Q. Which directive is used to apply dynamic styles in Angular?
  • (A) ngStyle
  • (B) ngIf
  • (C) ngSwitch
  • (D) ngClass
💬 Discuss
✅ Correct Answer: (A) ngStyle

Explanation: ngStyle is used to bind dynamic inline styles.

📊 Angular
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
💬 Discuss
✅ Correct Answer: (C) To improve performance by tracking item identity

Explanation: trackBy improves performance by tracking the identity of items.

📊 Angular
Q. What is the default ChangeDetectionStrategy in Angular?
  • (A) Manual
  • (B) Optimized
  • (C) OnPush
  • (D) Default
💬 Discuss
✅ Correct Answer: (D) Default

Explanation: Angular uses the Default change detection strategy unless OnPush is specified.

📊 Angular
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
💬 Discuss
✅ Correct Answer: (A) Karma and Jasmine

Explanation: Karma is the test runner and Jasmine is the testing framework used by Angular.

📊 Angular
Q. Which keyword is used for dependency injection in a constructor?
  • (A) inject
  • (B) import
  • (C) private/public/protected
  • (D) new
💬 Discuss
✅ Correct Answer: (C) private/public/protected

Explanation: Access modifiers like private/public allow Angular to inject services into constructors.

📊 Angular
Q. What does Angular use internally for reactivity and asynchronous programming?
  • (A) Promises
  • (B) Observables
  • (C) Callbacks
  • (D) async/await
💬 Discuss
✅ Correct Answer: (B) Observables

Explanation: Angular uses Observables (RxJS) for handling async data streams.

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