Ultimate Threads And Concurrency Test - 53+ MCQs: Threads and Concurrency test: Evaluate Your Programming Skills with Concurrency Questions and Answers

1. What is the purpose of the 'join' method in Java threads?

To start a new thread.

To pause the execution of a thread.

To wait for a thread to complete its execution.

To synchronize multiple threads.

2. How does the 'volatile' keyword in Java contribute to thread safety?

It ensures a variable is always initialized.

It prevents multiple threads from accessing the same variable.

It optimizes code execution.

It indicates that a variable may be changed by multiple threads.

3. How can you prevent a deadlock in concurrent programming?

By avoiding the use of threads.

By ensuring a consistent order of thread execution.

By carefully managing the acquisition of locks.

By increasing the number of threads.

4. How does multithreading differ from multitasking?

Multithreading is the execution of multiple threads in parallel, while multitasking is the execution of multiple processes.

Multithreading and multitasking are interchangeable terms.

Multitasking is the execution of multiple threads in parallel, while multithreading is the execution of multiple processes.

Multithreading and multitasking have the same meaning.

5. Explain the difference between parallelism and concurrency in programming.

Parallelism involves executing multiple threads simultaneously, while concurrency involves managing multiple tasks.

Parallelism and concurrency are synonymous terms.

Concurrency is about executing threads sequentially, while parallelism is about managing tasks concurrently.

Parallelism is the efficient synchronization of threads.

6. What is thread pooling, and how does it improve the performance of a program?

Thread pooling involves creating a large number of threads for efficient parallelism.

Thread pooling assigns a unique pool to each thread for optimal resource utilization.

Thread pooling manages a fixed number of threads for task execution, reducing thread creation overhead.

Thread pooling is a technique for avoiding thread synchronization issues.

7. What is a race condition in multithreading, and how can it be prevented?

A race condition occurs when multiple threads access shared data concurrently, leading to unpredictable outcomes. Prevention involves proper synchronization using locks or semaphores.

Race conditions are only relevant in single-threaded applications.

Multithreading eliminates the possibility of race conditions.

Race conditions can be prevented by increasing thread priorities.

8. What is the 'starvation' phenomenon in concurrent programming?

A situation where threads are blocked indefinitely.

A condition where threads are given priority based on their execution time.

A scenario where a thread is unable to access resources it needs for a long time.

A situation where threads are executed in parallel without any issues.

9. Explain the 'Fork-Join' framework in Java and how it facilitates parallelism in programming.

It is a mechanism for creating lightweight processes.

It is a framework for parallelizing recursive algorithms.

It is a method for avoiding race conditions.

It is a synchronization primitive for managing multiple threads.

10. What is the purpose of the 'yield' method in Java threads?

To stop the execution of a thread.

To relinquish the CPU so that other threads can be scheduled.

To pause a thread indefinitely.

To increase the priority of a thread.

11. What is the role of a thread scheduler?

To assign unique IDs to threads.

To manage the execution order of threads.

To stop the execution of threads.

To increase the priority of threads.

12. Why is thread synchronization important?

To increase parallelism.

To avoid race conditions and ensure data consistency.

To simplify code execution.

To reduce the number of threads.

13. What is the role of the 'CountDownLatch' class in Java, and how is it useful in concurrent programming?

To count the number of threads in a program.

To synchronize the execution of multiple threads.

To indicate the completion of a set of operations by multiple threads.

To control the number of resources available to threads.

14. Which of the following is an example of a race condition?

Properly synchronized access to shared data.

Consistent order of thread execution.

Conflicting access to shared data leading to unpredictable results.

Sequential execution of threads.

15. What is the 'Exchanger' class in Java, and how does it facilitate communication between threads?

It exchanges data between threads in a producer-consumer model.

It allows threads to exchange objects at a synchronization point.

It ensures that only one thread can access shared resources at a time.

It is used to create a mutual exclusion lock.

16. Which programming languages commonly support multithreading?

Python

Java

HTML

17. How does the 'Thread.interrupt()' method work in Java, and what is its role in managing threads?

It forcefully stops the execution of a thread.

It pauses the execution of a thread indefinitely.

It sets a flag indicating that the thread should stop, allowing it to gracefully exit.

It increases the priority of a thread.

18. How can you implement a producer-consumer scenario in concurrent programming?

By using a single thread for both production and consumption.

By ensuring that producers and consumers run independently.

By avoiding the use of threads in a producer-consumer model.

By relying on a single shared resource for both producers and consumers.

19. How can you handle thread starvation in concurrent programming?

By increasing the priority of threads.

By ensuring a consistent order of thread execution.

By managing the acquisition of locks.

By prioritizing threads based on their execution time.

20. How does a semaphore control access to resources?

By allowing multiple threads simultaneous access.

By restricting access to one thread at a time.

By randomly assigning access to threads.

By preventing access to all threads.

Threads and Concurrency MCQ Test 4