Multi Threading Practice Questions

1

Question 1 of 56

Which of the following is the correct way to start a thread in Java?

run()

start()

execute()

inti()

2

Question 2 of 56

What happens if you call run() instead of start() on a Thread object?

A new thread starts.

Nothing happens.

The code runs in the current thread.

Compilation error.

3

Question 3 of 56

Which method is used to make a thread wait for another to finish?

sleep()

wait()

join()

notify()

4

Question 4 of 56

Which of the following methods can cause a thread to go from running to waiting state?

yield()

sleep()

notify()

stop()

5

Question 5 of 56

What is the default priority of a thread in Java?

0

5

10

1

6

Question 6 of 56

Which interface must be implemented to define a thread without extending the Thread class?

Runnable

Callable

Executor

ThreadGroup

7

Question 7 of 56

What is the difference between wait() and sleep()?

wait() releases lock, sleep() does not.

Both release lock.

Both don’t release lock.

sleep() releases lock, wait() does not.

8

Question 8 of 56

Which of these is true about the volatile keyword in Java?

It makes variables constant.

It prevents thread synchronization.

It ensures visibility of changes across threads.

It locks the variable.

9

Question 9 of 56

What happens if an exception occurs inside a thread’s run() method and is not caught?

The JVM stops all threads.

Only that thread terminates.

The program restarts.

The exception is ignored.

10

Question 10 of 56

Which of the following correctly uses a synchronized block?

synchronized(this) { /* code */ }

synchronized Thread { /* code */ }

synchronized() { /* code */ }

synchronized(void) { /* code */ }

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Multi ThreadingPractice Questions