Threads -Java Programming MCQ Questions and Answers

11

What is the purpose of the join() method in Java threads?

A) It synchronizes threads B) It resumes a paused thread C) It waits for a thread to complete its execution before moving on D) It starts a new thread

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Answer: Option C

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12

What is a deadlock in multithreading?

A) A situation where a thread runs indefinitely without blocking B) A situation where all threads complete successfully C) A situation where a thread is terminated forcibly D) A situation where two or more threads are unable to proceed because they are each waiting for the other to release a resource

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Answer: Option D

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13

In Java, what is the difference between a thread's priority and its thread group's maximum priority?

A) A thread's priority determines its relative importance, while the thread group's maximum priority sets an upper limit on thread priorities B) A thread's priority is always higher than the thread group's maximum priority C) A thread's priority is the same as the thread group's maximum priority D) A thread's priority is unrelated to the thread group's maximum priority

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Answer: Option A

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14

How can you check if a thread is still running in Java?

A) By using the runStatus() method B) By using the isThreadAlive() method C) By using the isRunning() method D) By using the isAlive() method

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Answer: Option D

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15

In Java, can you force a thread to stop its execution using the stop() method?

A) No, the stop() method is deprecated and cannot be used B) Only if the thread is marked as "final" C) Yes, but it is discouraged because it can leave the program in an inconsistent state D) Only if the thread is marked as "static"

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Answer: Option C

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16

What is the purpose of the yield() method in Java threads?

A) It suspends the current thread indefinitely B) It suggests that the current thread should yield to other threads with the same priority C) It sets the priority of the current thread D) None of These

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Answer: Option B

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17

In Java, what is the purpose of the interrupt() method in threads?

A) It resumes the thread B) It pauses the thread C) It interrupts the normal execution of a thread, causing it to throw an InterruptedException D) It stops the thread permanently

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Answer: Option C

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18

Which keyword is used to declare a synchronized method in Java?

A) sync B) lock C) thread-safe D) synchronized

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Answer: Option D

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19

In Java, what is a daemon thread?

A) A thread that runs in the background and does not prevent the program from exiting B) A thread that is always in a waiting state C) A thread that cannot be interrupted D) A thread that runs on a separate CPU

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Answer: Option A

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20

How can you prevent multiple threads from accessing a critical section of code simultaneously in Java?

A) By using the wait() method B) By using the start() method multiple times C) By creating more threads to access the critical section D) By using synchronized blocks or methods

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Answer: Option D

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