Operating System Mcqs

Page No. 98

What is the role of base/bound registers?


aThey give starting address to a program

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bProgram’s addresses are neatly confined to space between the base and the bound registers

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cThey provide encrypted environment

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dThis technique doesn’t protects a program’s address from modification by another user

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What is the basic need in protecting memory in multi-user environment?


aWe need two registers one ‘start’ and other ‘end’

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bWe need a variable register

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cA fence register has to be used known as base register.

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dNone of the mentioned

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How can fence and relocation be used together?


aTo each program address, the contents of fence register are added

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bTo contents of fence register is subtracted from actual address of program

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cTo each program address, the contents of fence register are not added

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dNone of the mentioned

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What is correct regarding ‘relocation’ w.r.t protecting memory?


aIt is a process of taking a program as if it began at address 0

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bIt is a process of taking a program as if it began at address 0A

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cFence cannot be used within relocation process

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dAll of the mentioned

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What is not true regarding ‘Fence’?


aIt is implemented via hardware register

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bIt doesn’t protect users from each other

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cIt good to protect OS from abusive users

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dIts implementation is unrestricted and can take any amount of space in Operating system.

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What is true regarding ‘Fence’?


aIts a method to confine users to one side of a boundary

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bIt can protect Operating system from one user

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cIt cannot protect users from each other

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dAll of the mentioned

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View Answer All of the mentioned

What are the two capabilities defined in CAP system?


adata & software capability

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baddress & data capability

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chardware & software capability

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dsoftware capability

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What are the characteristics of Cambridge CAP system as compared to Hydra system?


aIt is simpler and less powerful than hydra system

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bIt is more powerful than hydra system

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cIt is powerful than hydra system

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dIt is not as secure as Hydra system

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What is the problem of mutually suspicious subsystem?


aService program can steal users data

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bService program can malfunction and retain some rights of data provided by user

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cCalling program can get access to restricted portion from service program

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dCalling program gets unrestricted access

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What are the characteristics of rights amplification in Hydra?


aThis scheme allows a procedure to be certified as trustworthy

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bAmplification of rights cannot be stated explicitly in declaration

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cIt includes kernel rights such as read

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dAll of the mentioned

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