Threading and Multithreading MCQs: Concepts and Implementation
Questions: 30
Questions
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1. What is a thread in the context of operating systems?
- a) A process that runs in isolation
- b) The smallest unit of execution within a process
- c) A collection of processes sharing resources
- d) A virtual representation of system memory
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2. Which of the following best describes multithreading?
- a) Running multiple processes simultaneously
- b) Running multiple threads within a single process
- c) Allocating memory to different programs
- d) Scheduling tasks in sequential order
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3. What is the main advantage of using multithreading in applications?
- a) Improved memory usage
- b) Faster single-threaded performance
- c) Increased responsiveness and parallelism
- d) Reduced CPU usage
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4. What is a key challenge of multithreading?
- a) Memory allocation issues
- b) Synchronization and avoiding race conditions
- c) Low processor utilization
- d) Redundant resource usage
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5. Which of the following is an example of thread-safe operation?
- a) Reading from a shared variable without locks
- b) Modifying shared data with proper synchronization
- c) Writing to global memory without checks
- d) Accessing a file without considering concurrent threads
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6. In Java, which class is commonly used to create threads?
- a) ThreadPool
- b) Thread
- c) Runnable
- d) Executor
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7. What is the state of a thread when it is waiting for a resource?
- a) Running
- b) Waiting
- c) Terminated
- d) Blocked
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8. What does context switching refer to in multithreading?
- a) Switching between user and kernel modes
- b) Switching the CPU's focus between threads
- c) Allocating resources to a process
- d) Synchronizing shared memory
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9. Which threading model maps multiple threads to multiple processors?
- a) One-to-one model
- b) Many-to-one model
- c) Many-to-many model
- d) Kernel-level model
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10. What mechanism prevents two threads from accessing shared resources simultaneously?
- a) Semaphore
- b) Mutex
- c) Critical section
- d) All of the above
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11. In Python, which module is used for creating threads?
- a) multiprocessing
- b) threading
- c) asyncio
- d) concurrent.futures
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12. Which of the following is not a thread state?
- a) Ready
- b) Waiting
- c) Running
- d) Suspended
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13. What is a race condition?
- a) A condition where threads compete for CPU time
- b) A scenario where the outcome depends on the thread execution order
- c) A type of thread-safe execution
- d) An error in thread termination
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14. What is the primary use of a thread pool?
- a) To allocate memory to processes
- b) To manage multiple threads efficiently
- c) To handle file I/O operations
- d) To synchronize thread execution
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15. Which of the following is a lightweight process?
- a) Thread
- b) Task
- c) Process
- d) Job
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16. Deadlock in multithreading occurs when:
- a) Threads execute simultaneously
- b) Threads wait indefinitely for resources held by each other
- c) Thread priorities are ignored
- d) All threads terminate normally
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17. The term "thread priority" refers to:
- a) The order of thread execution based on importance
- b) The speed of thread execution
- c) The memory allocated to threads
- d) The total number of active threads
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18. What is a daemon thread in Java?
- a) A thread that runs in the background and terminates when the program ends
- b) A thread that handles user requests
- c) A thread that prevents deadlocks
- d) A thread with the highest priority
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19. Which of these is not a synchronization mechanism?
- a) Semaphore
- b) Monitor
- c) Mutex
- d) Context switch
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20. In C++, which library provides support for multithreading?
- a) std::thread
- b) pthreads
- c) OpenMP
- d) All of the above
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21. What is the primary purpose of a lock in multithreading?
- a) To increase execution speed
- b) To prevent simultaneous access to shared resources
- c) To allow threads to communicate
- d) To reduce memory usage
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22. What does GIL stand for in Python threading?
- a) Global Instruction Lock
- b) Global Interpreter Lock
- c) General Incremental Lock
- d) Generic Interface Library
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23. Which scheduling algorithm is commonly used in multithreading?
- a) First-Come-First-Served
- b) Round-Robin
- c) Shortest Job Next
- d) Longest Job First
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24. Which of the following is a disadvantage of multithreading?
- a) Increased resource utilization
- b) Simplified program logic
- c) Increased complexity in debugging
- d) Enhanced responsiveness
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25. The main thread in a multithreaded program is:
- a) The thread that creates child threads
- b) A background thread
- c) The last thread to terminate
- d) A low-priority thread
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26. Which of the following can cause a thread to terminate?
- a) Completing its task
- b) Calling the terminate() function
- c) Receiving a signal from the operating system
- d) All of the above
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27. What is thread starvation?
- a) Threads being unable to access shared memory
- b) High-priority threads preventing low-priority threads from executing
- c) Threads competing for CPU resources
- d) Synchronization mechanisms failing
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28. Thread-local storage is used for:
- a) Sharing memory between threads
- b) Storing data unique to each thread
- c) Allocating memory to all threads
- d) Managing thread priorities
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29. Which of the following conditions is necessary for a deadlock to occur?
- a) Circular wait
- b) Mutual exclusion
- c) Hold and wait
- d) All of the above
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30. What is the main goal of thread synchronization?
- a) To ensure threads execute in order of creation
- b) To prevent conflicts and inconsistencies in shared resources
- c) To allocate CPU time equally among threads
- d) To improve memory allocation efficiency
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