Deadlocks in Operating Systems MCQs: Detection, Prevention and Avoidance
Questions: 30
Questions
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1. A deadlock occurs in a system when:
- a) Processes are blocked from executing due to resource contention
- b) A process consumes all available memory
- c) A process is running without interruption
- d) Resources are allocated to processes in a non-sequential order
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2. Which of the following is a necessary condition for a deadlock to occur?
- a) Mutual exclusion
- b) Resource preemption
- c) Process starvation
- d) Process synchronization
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3. Which technique is used to detect deadlocks in an operating system?
- a) Resource allocation graph
- b) FIFO scheduling
- c) Round Robin scheduling
- d) Page replacement algorithms
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4. The Banker's Algorithm is primarily used for:
- a) Deadlock detection
- b) Deadlock prevention
- c) Deadlock avoidance
- d) Resource allocation
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5. Which of the following is a strategy for preventing deadlocks?
- a) Resource allocation graph
- b) Process synchronization
- c) Ensuring that at least one deadlock condition is violated
- d) Using virtual memory
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6. The deadlock detection algorithm for detecting deadlocks in a resource allocation graph uses:
- a) Process states
- b) Cycles in the graph
- c) Waiting time of processes
- d) Priority of the processes
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7. Which of the following is a characteristic of deadlock prevention?
- a) It allows deadlocks to occur but tries to avoid them at a later stage
- b) It requires breaking one of the Coffman’s necessary conditions
- c) It detects deadlocks once they happen
- d) It allows the system to recover from a deadlock
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8. In the context of deadlocks, which condition is associated with the concept of ‘hold and wait’?
- a) A process holding resources and waiting for others
- b) A process waiting for all resources to be allocated at once
- c) A process receiving resources in sequence
- d) A process executing independently of other processes
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9. Which of the following is an example of a deadlock avoidance strategy?
- a) Resource preemption
- b) Using a priority-based scheduling mechanism
- c) Ensuring that the system does not enter an unsafe state
- d) Allowing infinite resources
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10. The deadlock detection and recovery strategy involves:
- a) Killing all processes in the system
- b) Analyzing resource allocation and process states to find deadlock cycles
- c) Using priority scheduling
- d) Preventing resources from being allocated to processes
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11. Which of the following can lead to deadlock in an operating system?
- a) Circular wait condition
- b) High CPU utilization
- c) Preemptive resource allocation
- d) Frequent context switching
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12. Which of the following is true about the hold and wait condition in deadlock?
- a) A process must hold at least one resource while waiting for others
- b) A process must release all resources before waiting
- c) It prevents a system from entering a deadlock
- d) It guarantees that a process will eventually be executed
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13. Deadlock prevention is achieved by:
- a) Allowing processes to wait indefinitely for resources
- b) Breaking one of the Coffman’s necessary conditions
- c) Ignoring resource allocation
- d) Using high-level abstractions
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14. Which of the following is a necessary condition for deadlock to occur?
- a) Mutual exclusion
- b) Deadlock detection
- c) Process synchronization
- d) Priority inversion
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15. A resource allocation graph is used to:
- a) Allocate resources to processes
- b) Prevent deadlocks from occurring
- c) Detect cycles and deadlocks
- d) Monitor system performance
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16. Which of the following algorithms is used for deadlock avoidance?
- a) Banker's Algorithm
- b) First-Come, First-Served (FCFS)
- c) Shortest Job First (SJF)
- d) Round Robin (RR)
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17. In which situation is deadlock detection most useful?
- a) When the system is unable to allocate new resources
- b) When there is an ongoing need to continuously monitor for deadlocks
- c) When resources are dynamically allocated in an uncertain order
- d) When the system has limited resources
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18. The ‘Circular Wait’ condition for deadlock occurs when:
- a) Each process holds a resource and waits for another resource in a circular chain
- b) A process waits indefinitely for resources to be allocated
- c) Resources are allocated in a round-robin fashion
- d) Processes are continuously synchronized
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19. In which of the following cases would deadlock avoidance not be required?
- a) In systems with no shared resources
- b) In systems with very few processes
- c) In systems that do not have resource sharing
- d) In systems where resources are preempted automatically
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20. Which technique helps resolve deadlock by removing the cause of resource contention?
- a) Resource allocation graph
- b) Preemption of resources
- c) Process starvation
- d) Timeout mechanisms
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21. The ‘No preemption’ condition of deadlock is violated when:
- a) Resources can be forcibly taken from a process holding them
- b) Resources are allocated to processes without any check
- c) Processes are unable to release resources
- d) Resources are pre-empted at regular intervals
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22. The ‘Wait-For Graph’ method is used in:
- a) Process scheduling
- b) Deadlock prevention
- c) Deadlock avoidance
- d) Deadlock detection
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23. Which of the following is true about deadlock recovery?
- a) It involves removing resources from processes until deadlock is resolved
- b) It uses priority mechanisms to continue process execution
- c) It allocates additional resources to deadlocked processes
- d) It prevents deadlocks by blocking processes from entering the system
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24. Which of the following is the correct sequence of actions to recover from deadlock?
- a) Allow processes to run indefinitely
- b) Allocate additional resources, restart processes, preempt resources
- c) Monitor resource allocation, avoid starvation, restart processes
- d) Detect, preempt resources, roll back processes, restart
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25. In the context of resource allocation, which of the following does not violate deadlock prevention rules?
- a) Allocating resources one by one and ensuring that no circular wait occurs
- b) Allocating all resources to a process before execution
- c) Allowing processes to hold resources indefinitely while waiting
- d) Allowing mutual exclusion without restrictions
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26. In which situation is deadlock prevention the most effective?
- a) When system resources are extremely limited
- b) When there is a high number of concurrent processes and resources
- c) When there is little resource contention in the system
- d) When processes require continuous access to shared resources
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27. What is the primary goal of deadlock detection in a system?
- a) To identify whether a system is in a deadlock state
- b) To prevent processes from accessing resources
- c) To allocate resources equally to all processes
- d) To synchronize process execution
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28. Which of the following methods can help in the recovery of a deadlock in a system?
- a) Rebooting the system
- b) Giving priority to processes based on their execution time
- c) Preventing resources from being allocated
- d) Rollback of processes to a safe state
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29. What is a ‘safe state’ in the context of deadlock avoidance?
- a) A state where all processes can finish executing without causing a deadlock
- b) A state where processes can be preempted at any time
- c) A state where resources are allocated randomly
- d) A state where all resources are locked
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30. Which of the following is not a valid method of deadlock prevention?
- a) Ensuring the system never enters a circular wait
- b) Allowing resources to be preempted
- c) Allowing processes to request resources after they have started execution
- d) Forcing processes to request all resources at once
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