1. What is a thread in the context of operating systems?
- A process that runs in isolation
- The smallest unit of execution within a process
- A collection of processes sharing resources
- A virtual representation of system memory
Threading and Multithreading MCQs: Concepts and Implementation
Test your understanding of threading and multithreading with this MCQ exam. Explore core concepts, implementations, synchronization and performance optimization techniques.
📌 Important Exam Instructions
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- 📋 Total Questions: 30
- ⏳ Time Limit: 30 minutes
- 📝 Marking Scheme: +1 for each correct answer. No negative marking.
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- 🔍 Carefully read all questions before submitting your answers.
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Time Left (min): 00:00
2. Which of the following best describes multithreading?
- Running multiple processes simultaneously
- Running multiple threads within a single process
- Allocating memory to different programs
- Scheduling tasks in sequential order
3. What is the main advantage of using multithreading in applications?
- Improved memory usage
- Faster single-threaded performance
- Increased responsiveness and parallelism
- Reduced CPU usage
4. What is a key challenge of multithreading?
- Memory allocation issues
- Synchronization and avoiding race conditions
- Low processor utilization
- Redundant resource usage
5. Which of the following is an example of thread-safe operation?
- Reading from a shared variable without locks
- Modifying shared data with proper synchronization
- Writing to global memory without checks
- Accessing a file without considering concurrent threads
6. In Java, which class is commonly used to create threads?
- ThreadPool
- Thread
- Runnable
- Executor
7. What is the state of a thread when it is waiting for a resource?
- Running
- Waiting
- Terminated
- Blocked
8. What does context switching refer to in multithreading?
- Switching between user and kernel modes
- Switching the CPU's focus between threads
- Allocating resources to a process
- Synchronizing shared memory
9. Which threading model maps multiple threads to multiple processors?
- One-to-one model
- Many-to-one model
- Many-to-many model
- Kernel-level model
10. What mechanism prevents two threads from accessing shared resources simultaneously?
- Semaphore
- Mutex
- Critical section
- All of the above
11. In Python, which module is used for creating threads?
- multiprocessing
- threading
- asyncio
- concurrent.futures
12. Which of the following is not a thread state?
- Ready
- Waiting
- Running
- Suspended
13. What is a race condition?
- A condition where threads compete for CPU time
- A scenario where the outcome depends on the thread execution order
- A type of thread-safe execution
- An error in thread termination
14. What is the primary use of a thread pool?
- To allocate memory to processes
- To manage multiple threads efficiently
- To handle file I/O operations
- To synchronize thread execution
15. Which of the following is a lightweight process?
- Thread
- Task
- Process
- Job
16. Deadlock in multithreading occurs when:
- Threads execute simultaneously
- Threads wait indefinitely for resources held by each other
- Thread priorities are ignored
- All threads terminate normally
17. The term "thread priority" refers to:
- The order of thread execution based on importance
- The speed of thread execution
- The memory allocated to threads
- The total number of active threads
18. What is a daemon thread in Java?
- A thread that runs in the background and terminates when the program ends
- A thread that handles user requests
- A thread that prevents deadlocks
- A thread with the highest priority
19. Which of these is not a synchronization mechanism?
- Semaphore
- Monitor
- Mutex
- Context switch
20. In C++, which library provides support for multithreading?
- std::thread
- pthreads
- OpenMP
- All of the above
21. What is the primary purpose of a lock in multithreading?
- To increase execution speed
- To prevent simultaneous access to shared resources
- To allow threads to communicate
- To reduce memory usage
22. What does GIL stand for in Python threading?
- Global Instruction Lock
- Global Interpreter Lock
- General Incremental Lock
- Generic Interface Library
23. Which scheduling algorithm is commonly used in multithreading?
- First-Come-First-Served
- Round-Robin
- Shortest Job Next
- Longest Job First
24. Which of the following is a disadvantage of multithreading?
- Increased resource utilization
- Simplified program logic
- Increased complexity in debugging
- Enhanced responsiveness
25. The main thread in a multithreaded program is:
- The thread that creates child threads
- A background thread
- The last thread to terminate
- A low-priority thread
26. Which of the following can cause a thread to terminate?
- Completing its task
- Calling the terminate() function
- Receiving a signal from the operating system
- All of the above
27. What is thread starvation?
- Threads being unable to access shared memory
- High-priority threads preventing low-priority threads from executing
- Threads competing for CPU resources
- Synchronization mechanisms failing
28. Thread-local storage is used for:
- Sharing memory between threads
- Storing data unique to each thread
- Allocating memory to all threads
- Managing thread priorities
29. Which of the following conditions is necessary for a deadlock to occur?
- Circular wait
- Mutual exclusion
- Hold and wait
- All of the above
30. What is the main goal of thread synchronization?
- To ensure threads execute in order of creation
- To prevent conflicts and inconsistencies in shared resources
- To allocate CPU time equally among threads
- To improve memory allocation efficiency