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

1. What is the 'Phaser' class in Java, and how is it used for synchronization in concurrent programming?

To synchronize threads by allowing them to advance in phases.

To synchronize threads by pausing their execution.

To synchronize threads by controlling access to shared resources.

To synchronize threads by assigning unique IDs.

2. 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.

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. Explain the concept of thread deadlock and provide a common scenario where it might occur.

A situation where a thread is blocked indefinitely.

A scenario where threads compete for resources.

A condition where two or more threads are blocked waiting for each other to release resources.

A state where threads are executed in parallel without issues.

5. 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.

6. Explain the concept of 'Thread Groups' in Java and their role in managing threads.

Thread Groups are used to group threads based on their priority.

Thread Groups help organize threads based on their execution time.

Thread Groups provide a way to control the execution of multiple threads as a single unit.

Thread Groups are a type of synchronization primitive.

7. What is a condition variable in concurrent programming?

A variable that holds the condition for thread execution.

A variable indicating the state of a thread.

A synchronization primitive that allows threads to wait for a specific condition.

A variable that can be accessed by multiple threads simultaneously.

8. 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.

9. Explain the concept of a 'CyclicBarrier' in Java, and how is it used for synchronization?

It ensures cyclic execution of threads.

It prevents threads from reaching a synchronization point simultaneously.

It allows multiple threads to wait for each other at a predefined barrier.

It is a mechanism for creating thread pools.

10. What is the role of the 'CopyOnWriteArrayList' class in concurrent programming, and when is it beneficial?

To copy data between threads efficiently.

To synchronize access to a shared list.

To provide a mutable, thread-safe list for scenarios with frequent reads and infrequent writes.

To ensure that a list can only be modified by a single thread.

11. 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.

12. What is the primary purpose of thread pooling?

To create more threads than necessary.

To manage a fixed number of threads for task execution.

To assign a unique pool to each thread.

To synchronize the execution of multiple threads.

13. 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.

14. 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.

15. What is the main advantage of using threads in a program?

Increased complexity of code.

Reduced responsiveness.

Improved resource utilization and responsiveness.

Decreased parallelism.

16. What does the term 'atomic operation' mean in concurrent programming?

An operation performed by atomic threads.

An operation that cannot be interrupted, ensuring consistency.

An operation that involves atomic particles.

An operation with a large execution time.

17. What is parallelism?

Executing multiple threads at the same time.

Executing code sequentially.

Running threads in isolation.

A type of data structure.

18. What is the 'ThreadLocalRandom' class in Java, and how is it used in concurrent programming?

It provides a thread-safe random number generator.

It ensures that random numbers generated by threads are synchronized.

It allows threads to share random numbers without synchronization.

It is used to create random threads in a program.

19. Explain the concept of a 'Latch' in concurrent programming, and how is it used to synchronize threads?

A latch is used to synchronize thread execution order.

A latch is a mechanism for controlling access to shared resources.

A latch is a synchronization primitive that allows one or more threads to wait until a set of operations is completed.

A latch is a type of atomic operation.

20. What is the significance of the 'ThreadLocal' class in Java, and how is it used in concurrent programming?

To declare variables as constants.

To manage a pool of threads.

To store variables specific to each thread.

To execute operations in a separate thread.

21. What is a semaphore and how is it used in concurrent programming?

A signal used to stop thread execution.

A synchronization primitive for controlling access to resources.

A lightweight process that runs in the background.

A type of data structure.

22. What is a thread in programming?

A sequence of instructions executed independently.

A lightweight process that shares the same resources.

A type of data structure.

A section of code that runs in parallel.

23. What is the purpose of the 'wait' method in Java threads?

To pause a thread indefinitely.

To resume the execution of a paused thread.

To wait for a specific condition to be met.

To stop the execution of a thread.

24. 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.

25. Explain the concept of a 'read-write lock' in concurrent programming and its advantages.

It allows multiple threads to read the same data simultaneously, improving efficiency.

It ensures only one thread can read data at a time.

It prevents multiple threads from accessing shared resources.

It is used to synchronize write operations across multiple threads.

26. How can you achieve thread safety in Java?

By avoiding the use of threads.

By ensuring that a single thread executes the entire program.

By using synchronization mechanisms to control access to shared resources.

By increasing the number of threads.

27. What is the purpose of the 'volatile' keyword in Java?

To declare variables as constant.

To ensure that the variable is always initialized.

To indicate that a variable may be changed by multiple threads.

To optimize code execution.

28. Which programming languages commonly support multithreading?

Python

Java

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29. What is the purpose of the 'ScheduledExecutorService' in Java, and how does it differ from a regular 'ExecutorService'?

To execute tasks at a fixed rate.

To execute tasks based on a fixed schedule.

To execute tasks asynchronously.

To execute tasks in parallel across multiple threads.

30. 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.

Threads and Concurrency MCQ Test 3