Java Multithreading MCQs with answers Page - 1

You will find multiple-choice questions (MCQs) related to #Java Multithreading here. Go through these questions to prepare effectively for your upcoming exams and interviews.

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Q. What is the main advantage of multithreading in Java?

  • (A) Reduces memory usage
  • (B) Improves user interface
  • (C) Improves performance by executing multiple threads concurrently
  • (D) Increases the size of the application

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Q. Which class must be extended to create a thread in Java?

  • (A) Runnable
  • (B) Thread
  • (C) Object
  • (D) Executor

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Q. Which method starts a thread's execution?

  • (A) run()
  • (B) start()
  • (C) execute()
  • (D) init()

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Q. What is the purpose of the run() method in Java threads?

  • (A) To stop the thread
  • (B) To initiate the thread
  • (C) To define the code executed by the thread
  • (D) To pause the thread

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Q. What happens if you directly call run() instead of start()?

  • (A) It starts a new thread
  • (B) It throws an exception
  • (C) It runs on the main thread
  • (D) It terminates immediately

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Q. Which method pauses a thread for a specific time?

  • (A) pause()
  • (B) stop()
  • (C) wait()
  • (D) sleep()

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Q. Which keyword is used to prevent thread interference and memory consistency errors?

  • (A) static
  • (B) volatile
  • (C) synchronized
  • (D) transient

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Q. What will happen if a thread is started twice using the same object?

  • (A) It runs twice
  • (B) It throws IllegalThreadStateException
  • (C) It runs once
  • (D) It restarts after completion

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Q. What is the default priority of a thread in Java?

  • (A) 0
  • (B) 1
  • (C) 5
  • (D) 10

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Q. Which constant represents the maximum thread priority?

  • (A) Thread.MAX_PRIORITY
  • (B) Thread.HIGH_PRIORITY
  • (C) Thread.TOP_PRIORITY
  • (D) Thread.ULTIMATE_PRIORITY

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