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OS Part 2 3
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Questions in this quiz (25)
1In operating system security and protection, authenticity is:
- AConcerned with the proper verification of the identity of users and the validity of messages or data
- BAssuring that users cannot read data for which access is unauthorized
- CProtection of data from unauthorized modification
- DConcerned with protecting the system against interruption
2An application programs is developed by the
- AApplication programmer
- BEnd user
- COperating system
- DHardware
3"The OS as a User/Computer interface" corresponds to the following objective
- AEfficiency
- BConvenience
- CAbility to evolve
4Process is
- AProgram in High level language kept on disk
- BContents of main memory
- CA job in secondary memory
- DA program in execution
5If a process is executing in its critical section, then no other processes can be executing in their critical section. This condition is called
- ASynchronous exclusion
- BCritical exclusion
- CAsynchronous exclusion
- DMutual exclusion
6In operating system security and protection, confidentiality is:
- AConcerned with the proper verification of the identity of users and the validity of messages or data
- BAssuring that users cannot read data for which access is unauthorized
- CProtection of data from unauthorized modification
- DConcerned with protecting the system against interruption
7In operating system security and protection, Data integrity is:
- AConcerned with the proper verification of the identity of users and the validity of messages or data
- BAssuring that users cannot read data for which access is unauthorized
- CProtection of data from unauthorized modification
- DConcerned with protecting the system against interruption
8When the time required for the I/O operation is less that the time to complete the execution of instructions between write operations in the user program, it is:
- AFast I/O wait
- BSlow I/O wait
- CLong I/O wait
- DShort I/O wait
9This type of memory is nonvolatile:
- ARegister
- BSecondary memory
- CCache
- DMain memory
10If the contents of a block in the cache are altered, then it is needed to save it back to main memory before replacing it. This is called:
- Awrite policy
- Bmapping function
- Clocality of reference
- Dreplacement algorithm
11What is not a structural element of a computer system?
- ASystem bus
- BMain memory
- COperating system
- DProcessor
12The main disadvantage of this technique: it is a time-consuming process that keeps the processor busy needlessly
- ADirect memory access (DMA)
- BManual memory access
- CInterrupt-driven I/O
- DProgrammed I/O
13Which of the following element of a computer system stores data and programs
- AMain memory
- BSystem bus
- CProcessor
- DI/O modules
14When an I/O device completes an I/O operation, the device issues an interrupt signal to the processor and then:
- AThe processor stops execution of the current instruction without finishing it and responds to the interrupt
- BThe processor loads the program counter with the entry location of the interrupt-handling routine
- CThe processor saves information needed to resume the current program at the point if interrupt
- DThe processor finishes execution of the current instruction before responding to the interrupt
15Complete the relationship concerning the memory systems: greater capacity
- Alower capacity
- Bslower access speed
- Cgreater cost per bit
- Dfaster access speed
16Which register contains condition codes set by the processor hardware as the result of operations?
- AProgram counter
- BAccumulator
- CProgram status word
- DStack pointer
17Which of the following provides for communication among elements of a computer system?
- Amain memory
- Bsystem bus
- Cprocessor
- DI/O modules
18We have
Ts = average (system) access time
T1 = access time of M1 (cache)
T2 = access time of M2 (main memory)
T3 = access time of M3 (disk)
H1 = hit ratio, fraction of time reference is found i M1
H2 = hit ratio, fraction of time reference is found i M2
The average time to access an item, in case the item in main memory is:- ATs = H1*T1 + H2*T2 + (1-H2)*T3
- BTs = H1*T1 + (1-H1)*(H1*T1 + H2*(T1 + T2) + (1 - H2)*(T2 + T3))
- CTs = H1*T1 + (1-H1)*(T1+T2)
- DTs = H1*T1 + (1-H1)*(H2*(T1 + T2) + (1 - H2)*(T1 + T2 + T3))
19Control and status registers control the operation of the processor and the execution of programs
- ATrue
- BFalse
20This type of system was developed at MIT by a group known as Project MAC for the IBM 709 in 1961
- ASerial processing
- BMultiprogrammed batch system
- CSimple batch system
- DTime-sharing-system
21The concept of codes of operation (user mode, system mode) was introduced with
- ATime-sharing-system
- BSimple batch system
- CMultiprogrammed batch system
- DSerial processing
22Short-term scheduler, or dispatcher, picks a process. Each process in the queue is given some time in turn. This strategy is called:
- ARound-robin technique
- BPrioritizing
- CCarousel technique
- DMerry-go-round technique
23Central idea in this system was the use of piece of software known as the monitor:
- ATime-sharing-system
- BSimple batch system
- CMultiprogrammed batch system
- DSerial processing
24'More than one program attempts to make use of a shared resource at the same time'. This is
- AFailed mutual exclusion
- BImproper synchronization
- CDeadlocks
- DNondeterminate program operation
25The term was first used by the designers of Multics in 1960s:
- AMonitor
- BProcess
- CMultiprogramming
- DTime sharing
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- Description
- Quiz on OS Part 2 3, created by Bekinston Talgio on 03/07/2019.
- Author
- Bekinston Talgio
- Language
- English
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- History
- Created on 3 Jul 2019 · updated on 3 Jul 2019
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