Question 21 : Each request requires that the system consider the _____________ to decide whether the current request can be satisfied or must wait to avoid a future possible deadlock.
1. resources currently available
2. processes that have previously been in the system
3. resources currently allocated to each process
4. future requests and releases of each process
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Question 22 : For non sharable resources like a printer, mutual exclusion :
1. must exist
2. must not exist
3. may exist
4. none of the mentioned
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Question 23 : Deadlock prevention is a set of methods :
1. to ensure that at least one of the necessary conditions cannot hold
2. to ensure that all of the necessary conditions do not hold
3. to decide if the requested resources for a process have to be given or not
4. to recover from a deadlock
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Question 24 : For a Hold and wait condition to prevail :
1. A process must be not be holding a resource, but waiting for one to be freed, and then request to acquire it
2. A process must be holding at least one resource and waiting to acquire additional resources that are being held by other processes
3. A process must hold at least one resource and not be waiting to acquire additional resources
4. None of the mentioned
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Question 25 : For Mutual exclusion to prevail in the system :
1. at least one resource must be held in a non sharable mode
2. the processor must be a uniprocessor rather than a multiprocessor
3. there must be at least one resource in a sharable mode
4. all of the mentioned
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Question 26 : For a deadlock to arise, which of the following conditions must hold simultaneously ?
1. Mutual exclusion
2. No preemption
3. Hold and wait
4. All of the mentioned
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Question 27 : Multithreaded programs are :
1. lesser prone to deadlocks
2. more prone to deadlocks
3. not at all prone to deadlocks
4. none of the mentioned
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Question 28 : The request and release of resources are ___________
1. command line statements
2. interrupts
3. system calls
4. special programs
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Question 29 : The number of resources requested by a process :
1. must always be less than the total number of resources available in the system
2. must always be equal to the total number of resources available in the system
3. must not exceed the total number of resources available in the system
4. must exceed the total number of resources available in the system
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Question 30 : To avoid deadlock
1. there must be a fixed number of resources to allocate
2. resource allocation must be done only once
3. all deadlocked processes must be aborted
4. inversion technique can be used
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