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.
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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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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
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