RxJS MCQs with answers Page - 1

Here, you will find a collection of MCQ questions on RxJS. Go through these questions to enhance your preparation for upcoming examinations and interviews.

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F

Fox Root • 490 Points
Goal Maker

Q. What is RxJS?

  • (A) A database framework
  • (B) A library for reactive programming using Observables
  • (C) A CSS framework
  • (D) A testing library

F

Fox Root • 490 Points
Goal Maker

Q. What is an Observable in RxJS?

  • (A) A variable
  • (B) A stream of asynchronous data
  • (C) A database table
  • (D) A DOM element

F

Fox Root • 490 Points
Goal Maker

Q. Which method is used to start receiving data from an Observable?

  • (A) connect()
  • (B) listen()
  • (C) subscribe()
  • (D) execute()

F

Fox Root • 490 Points
Goal Maker

Q. Which RxJS operator transforms emitted values?

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

F

Fox Root • 490 Points
Goal Maker

Q. Which operator filters emitted values based on a condition?

  • (A) reduce()
  • (B) filter()
  • (C) merge()
  • (D) concat()

F

Fox Root • 490 Points
Goal Maker

Q. What does the tap() operator do?

  • (A) Transforms data
  • (B) Performs side effects without modifying values
  • (C) Stops execution
  • (D) Combines streams

F

Fox Root • 490 Points
Goal Maker

Q. Which operator combines multiple Observables and emits when all complete?

  • (A) merge()
  • (B) forkJoin()
  • (C) switchMap()
  • (D) interval()

F

Fox Root • 490 Points
Goal Maker

Q. Which Subject type stores the latest emitted value?

  • (A) AsyncSubject
  • (B) BehaviorSubject
  • (C) ReplaySubject
  • (D) PublishSubject

F

Fox Root • 490 Points
Goal Maker

Q. Which operator is commonly used for HTTP requests in Angular?

  • (A) switchMap()
  • (B) reduce()
  • (C) every()
  • (D) count()

F

Fox Root • 490 Points
Goal Maker

Q. What does debounceTime() do?

  • (A) Delays subscription
  • (B) Ignores rapid emissions within a time interval
  • (C) Stops Observable
  • (D) Duplicates values

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