JavaScript MCQs with answers Page - 141

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

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Q. Which has higher priority in JavaScript event loop?

  • (A) microtasks
  • (B) macrotasks
  • (C) DOM events
  • (D) Timers

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Q. What does setInterval() do?

  • (A) Calls a function repeatedly at specified intervals
  • (B) Runs code only once after delay
  • (C) Stops execution
  • (D) Loops through array

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Q. What is the role of clearTimeout()?

  • (A) Cancels a timer set by setTimeout()
  • (B) Stops event propagation
  • (C) Clears the event queue
  • (D) Stops the event loop

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Q. Which method is used to add an event listener in JavaScript?

  • (A) addEventListener
  • (B) onEvent
  • (C) listenTo
  • (D) eventAttach

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Q. What is event delegation?

  • (A) Using a parent element to handle events for its children
  • (B) Delegating events to the OS
  • (C) Using multiple event listeners
  • (D) Broadcasting events

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Q. Which method is used to prevent the default action of an event?

  • (A) preventDefault()
  • (B) stopDefault()
  • (C) halt()
  • (D) cancelEvent()

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Q. Which method stops event propagation in the DOM?

  • (A) stopPropagation()
  • (B) preventDefault()
  • (C) cancelBubble()
  • (D) haltEvent()

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Q. Which JavaScript property refers to the element that triggered the event?

  • (A) event.target
  • (B) event.source
  • (C) event.trigger
  • (D) event.origin

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Q. Which function is used to delay execution of code by a given time?

  • (A) setTimeout()
  • (B) delay()
  • (C) wait()
  • (D) sleep()

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Q. What is the main thread in JavaScript?

  • (A) The single thread where JavaScript code executes
  • (B) A thread that handles HTTP requests
  • (C) A parallel execution thread
  • (D) The UI thread

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