Deadlocks MCQ
Understanding Deadlock: Test Your Knowledge with MCQs
Introduction: Welcome to our comprehensive multiple-choice question (MCQ) quiz on deadlocks. Test your understanding of this critical concept in computer science and operating systems. Let’s dive in and see how well you grasp the intricacies of deadlocks!
- What is a deadlock in operating systems?
A. A situation where a process never completes its execution
B. A situation where multiple processes are waiting for a resource that is held by another process
C. A situation where a process is terminated abruptly
D. A situation where a process is waiting for user input
Answer: B. A situation where multiple processes are waiting for a resource that is held by another process
2. Which of the following conditions must hold for a deadlock to occur?
A. Mutual exclusion, hold and wait, no preemption, circular wait
B. Mutual exclusion, hold and wait, preemption, circular wait
C. No mutual exclusion, hold and wait, preemption, circular wait
D. Mutual exclusion, no hold and wait, no preemption, circular wait
Answer: A. Mutual exclusion, hold and wait, no preemption, circular wait
3. Which of the following methods can be used to prevent deadlocks?
A. Resource allocation graph
B. Banker’s algorithm
C. Both A and B
D. None of the above
Answer: C. Both A and B
4. What is the purpose of the Banker’s algorithm?
A. To detect deadlocks
B. To prevent deadlocks
C. To recover from deadlocks
D. To allocate resources in a safe manner
Answer: D. To allocate resources in a safe manner
5. What is the role of a resource allocation graph in deadlock detection?
A. It determines the sequence of resource requests to prevent deadlocks
B. It shows the allocation of resources and the processes holding them
C. It identifies the potential for deadlocks by analyzing the resource allocation and request patterns
D. It resolves deadlocks by terminating one or more processes
Answer: C. It identifies the potential for deadlocks by analyzing the resource allocation and request patterns
6. Which of the following strategies can be used to deal with deadlocks?
A. Deadlock avoidance
B. Deadlock detection and recovery
C. Deadlock prevention
D. All of the above
Answer: D. All of the above
7. In the context of deadlocks, what is resource preemption?
A. Terminating a process to free up its held resources
B. Temporarily suspending a process until a resource becomes available
C. Granting a process exclusive access to a resource
D. Allocating additional resources to a process in order to avoid deadlock
Answer: A. Terminating a process to free up its held resources
8. What is the purpose of deadlock detection?
A. To prevent deadlocks from occurring
B. To identify when a deadlock has occurred
C. To recover from a deadlock situation
D. To prioritize processes based on their resource requirements
Answer: B. To identify when a deadlock has occurred
9. Which of the following is NOT a necessary condition for deadlock?
A. Mutual exclusion
B. Hold and wait
C. No preemption
D. Circular wait
Answer: C. No preemption
10. What is circular wait in the context of deadlocks?
A. A situation where two or more processes are waiting for a resource that is held by another process
B. A situation where a process is waiting for a resource that it is currently holding
C. A situation where processes are waiting for each other in a circular chain
D. A situation where multiple processes are executing concurrently
Answer: C. A situation where processes are waiting for each other in a circular chain
11. Which of the following resource allocation strategies can lead to deadlocks?
A. First-Come, First-Served (FCFS)
B. Round Robin
C. Priority-based scheduling
D. Resource allocation based on the Banker’s algorithm
Answer: A. First-Come, First-Served (FCFS)
12. What is the purpose of the Banker’s algorithm in deadlock avoidance?
A. To detect deadlocks and terminate the processes involved
B. To prevent deadlocks by ensuring that the system is always in a safe state
C. To recover from deadlocks by rolling back the affected processes
D. To allocate resources dynamically based on process priorities
Answer: B. To prevent deadlocks by ensuring that the system is always in a safe state
13. Which of the following is a necessary condition for deadlock but not a sufficient condition?
A. Mutual exclusion
B. Hold and wait
C. No preemption
D. Circular wait
Answer: D. Circular wait
14. What is the purpose of deadlock recovery in operating systems?
A. To prevent deadlocks from occurring in the first place
B. To detect deadlocks and take corrective actions
C. To terminate one or more processes involved in a deadlock
D. To restore the system to a consistent state after a deadlock has occurred
Answer: D. To restore the system to a consistent state after a deadlock has occurred
15. Which of the following approaches can be used to break a deadlock?
A. Resource preemption
B. Process termination
C. Rollback and restart
D. All of the above
Answer: D. All of the above
16. Which of the following deadlock avoidance algorithms dynamically calculates the available resources and checks if granting a resource to a process will result in a safe state?
A. Banker’s algorithm
B. Wait-for graph algorithm
C. Ostrich algorithm
D. Resource allocation graph algorithm
Answer: A. Banker’s algorithm
17. Which of the following is an example of a synchronization mechanism used to prevent deadlocks?
A. Semaphore
B. Mutex
C. Monitor
D. All of the above
Answer: D. All of the above
18. What is the role of a deadlock prevention technique in operating systems?
A. To detect when a deadlock occurs
B. To recover from a deadlock situation
C. To stop deadlocks from occurring in the first place
D. To prioritize processes based on their resource requirements
Answer: C. To stop deadlocks from occurring in the first place
19. What is the difference between deadlock prevention and deadlock avoidance?
A. Deadlock prevention aims to detect and terminate deadlocked processes, while deadlock avoidance aims to prevent deadlocks from occurring.
B. Deadlock prevention focuses on breaking the circular wait condition, while deadlock avoidance focuses on resource allocation.
C. Deadlock prevention requires a priori knowledge of resource requirements, while deadlock avoidance dynamically checks for safe states.
D. Deadlock prevention is a proactive approach, while deadlock avoidance is a reactive approach.
Answer: B. Deadlock prevention focuses on breaking the circular wait condition, while deadlock avoidance focuses on resource allocation.
20. What is starvation in the context of deadlocks?
A. A situation where a process is indefinitely prevented from making progress due to resource unavailability
B. A situation where multiple processes are waiting for each other in a circular chain
C. A situation where a process is waiting for a resource that it is currently holding
D. A situation where processes are waiting for a resource that is held by another process
Answer: A. A situation where a process is indefinitely prevented from making progress due to resource unavailability
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