Angular JS MCQs with answers Page - 12

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 a key benefit of using Angular's OnPush change detection strategy?

  • (A) Eager loading all components
  • (B) Improved performance by reducing change detection
  • (C) Adding extra watchers
  • (D) Automatically unsubscribing Observables

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Q. How can services be shared across all modules in Angular?

  • (A) Add them in any component
  • (B) Provide them in a child component
  • (C) Provide them in root injector using providedIn: 'root'
  • (D) Declare them in component metadata

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Q. What does the async pipe automatically do in templates?

  • (A) Refresh DOM manually
  • (B) Subscribe and unsubscribe from Observables
  • (C) Reload entire component
  • (D) Prevent memory leaks

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Q. Which file contains metadata for the root Angular module?

  • (A) index.html
  • (B) main.ts
  • (C) app.module.ts
  • (D) angular.json

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Q. Which method is used in Angular to clone an Observable?

  • (A) shareReplay()
  • (B) pipe()
  • (C) clone()
  • (D) repeat()

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Q. What is the use of ChangeDetectorRef in Angular?

  • (A) Creating dynamic components
  • (B) Manual triggering of change detection
  • (C) Routing between views
  • (D) Event handling

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Q. How can you track identity of items in ngFor for performance?

  • (A) Using index
  • (B) Using key
  • (C) Using trackBy function
  • (D) Using map operator

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Q. Which strategy reduces Angular bundle size?

  • (A) Using ng serve
  • (B) Importing all modules at once
  • (C) Lazy loading modules
  • (D) Using inline templates

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Q. What happens if you forget to unsubscribe from a subscription?

  • (A) Component runs faster
  • (B) No effect
  • (C) Memory leaks may occur
  • (D) Template errors

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Q. Which Angular compiler replaced ViewEngine?

  • (A) Ivy
  • (B) NGCC
  • (C) RxJS
  • (D) Zone.js

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