Operating System Mcqs

Page No. 104

Which is not a major component of a file system?


aDirectory service

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bAuthorization service

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c Shadow service

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dSystem service

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View Answer Shadow service

What are the different ways file accesses take place?


asequential access

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bdirect access

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cindexed sequential access

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dall of the mentioned

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View Answer all of the mentioned

What are characteristic of a DFS?


aFault tolerance

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bScalability

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cHeterogeneity of the system

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dUpgradation

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View Answer Upgradation

What are not the characteristics of a DFS?


alogin transparency and access transparency

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bFiles need not contain information about their physical location

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cNo Multiplicity of users

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dNo Multiplicity if files

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What are the different ways in which clients and servers are dispersed across machines?


aServers may not run on dedicated machines

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bServers and clients can be on same machines

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cDistribution cannot be interposed between a OS and the file system

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dOS cannot be distributed with the file system a part of that distribution

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What are non characteristics of session semantics?


a Each client obtains a working copy from the server

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bWhen file is closed, the modified file is copied to the file server

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cThe burden of coordinating file sharing is ignored by the system

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dEasy to implement in a single processor system

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What are the characteristics of transaction semantics?


aSuitable for applications that are concerned about coherence of data

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bThe users of this model are interested in the atomicity property for their transaction

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cEasy to implement in a single processor system

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dWrite-back enhances access performance

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What are the characteristics of Unix semantics?


aEasy to implement in a single processor system

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bData cached on a per process basis using write through case control

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cWrite-back enhances access performance

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dAll of the mentioned

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View Answer All of the mentioned

What are the three popular semantic modes?


aUnix, Coherent & Session semantics

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bUnix, Transaction & Session semantics

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cCoherent, Transaction & Session semantics

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dSession, Coherent semantics

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What is the coherency of replicated data?


aAll replicas are identical at all times

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bReplicas are perceived as identical only at some points in time

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cUsers always read the most recent data in the replicas

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dAll of the mentioned

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View Answer All of the mentioned

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