Angular JS MCQs with answers Page - 20

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 method is used to validate a FormControl in Angular?

  • (A) isValid()
  • (B) validate()
  • (C) status()
  • (D) setValidators()

A

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Q. Which built-in Angular validator checks if input is required?

  • (A) Validators.email
  • (B) Validators.required
  • (C) Validators.pattern
  • (D) Validators.length

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Q. How can you improve Angular app startup time?

  • (A) Use Ahead-of-Time (AOT) compilation
  • (B) Use larger images
  • (C) Disable lazy loading
  • (D) Use development build

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Q. What is the purpose of `trackBy` in `*ngFor`?

  • (A) Improves animations
  • (B) Optimizes DOM rendering
  • (C) Adds accessibility
  • (D) Enables SSR

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Q. Which command builds the Angular app in production mode?

  • (A) ng build prod
  • (B) ng prod
  • (C) ng build --prod
  • (D) ng create production

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Q. Which method resets a reactive form in Angular?

  • (A) clear()
  • (B) resetForm()
  • (C) reset()
  • (D) clearForm()

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Q. Which RxJS operator is best for canceling HTTP requests?

  • (A) mergeMap
  • (B) switchMap
  • (C) concatMap
  • (D) exhaustMap

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Q. Which Angular file is typically used to register providers globally?

  • (A) main.ts
  • (B) app.component.ts
  • (C) app.module.ts
  • (D) styles.css

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Q. Which command starts the Angular development server?

  • (A) ng serve
  • (B) ng build
  • (C) ng start
  • (D) ng dev

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Q. Which module is required to use routing in an Angular app?

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

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