osg3

a

3 Put job in waiting queue 4 Go fetch next job A) first-fit memory allocation B) best-fit memory allocation C) least-fit memory allocation D) fixed partition memory allocation

c

A ____ of processing must be handled as a unit. A) line B) segment C) critical region D) semaphore

a

A hybrid system is a combination of the ____ systems. A) batch and interactive B) batch and real -time C) interactive and real -time D) real-time and general-purpose

b

A network that's congested or has filled a large percentage of its I/O buffer space can become deadlocked if it doesn't have ____ to control the flow of messages through the network. A) procedures B) protocols C) policies D) rules

c

A supercomputer can perform ____ floating-point operations per second. A) 240 million B) 2.4 billion C) 2.4 trillion

a

A system with ____ divides programs into parts and keep them in secondary storage, bringing each part into memory only as it is needed. A) virtual memory B) shared memory C) segmented processing D) passive multiprogramming

b

A typical ____ computer houses devices to perform audio, video, and graphic creation and editing. A) multiprocessor B) multimedia C) networked D) PDA

a

As a job moves through the system it is always in one of five states (or at least three); these are called the job status or the process status. A) True B) False

d

Assume that the Page Map Table below is in effect. The number of lines per page is 400. The actual memory location for line 433 is ____. Job Page Number Page Frame Number 0 8 1 10 2 5 3 11 A) 1 B) 33 C) 4000 D) 4033

d

Automatic detection by the compiler of instructions that can be performed in parallel is called ____. A) automatic parallelism B) array parallelism C) explicit parallelism D) implicit parallelism

d

By compacting and relocating, the Memory Manager optimizes the use of memory and thus improves throughput, but an unfortunate side effect is more ____. A) null entries B) segmentation C) errors D) overhead

b

Consider a computer system that has cache memory, main memory (RAM) and disk, and OS uses virtual memory. It takes 2 nsec to access a byte from the cache. 20 nsec to access a byte from RAM. and 10 msec to access a block of 1000 bytes from the disk. If a b ook has 1000 pages, each with 50 lines of 80 characters each. How long it will take to electronically scan the textfor the case of the master copy being in each of the level as one proceeds down the memory hierarchy (from inboard memory to offline storage )? [A] 1 msec. 10 msec. 10 sec [B] 4 msec. 40 msec. 20 sec [C] 2 msec. 20 msec. 10 sec TO] 1 msec. 10 msec. 5 sec

b

Consider a swapping system in which the memory consists of the following hole sizes: 10 K, 4 K, 20 K, 15 K, 9 K. Assume first fit algorithm is used. Which holes are taken for successive segment requests of 8 K, 12 K, 10 K? [A] 9 K, 15 K, 10 K [B] 10 K, 20 K, 15 K [C] 20 K, 15 K, 4 K [D] None of the other choices

d

Consider the following four cases. The LRU policy,____, will be least likely to swap. Modified Referenced Meaning Case 1 0 0 Not modified AND not referenced Case 2 0 1 Not modified BUT was referenced Case 3 1 0 Was modified BUT not referenced Case 4 1 1 Was modified AND was refe renced A) Case 1 B) Case 2 C) Case 3 D) Case 4

b

Data recorded on fixed- head DASDs may or may not be blocked at the discretion of the ____. A) end user B) application programmer C) operator D) database administrator

c

Each active thread in a process shares the ____ and the resources allocated to its process. A) processor registers B) program counter C) data area D) status

b

Failure to lock database records before updating them may result in a ____ between processes. A) struggle B) race C) timeout D) livelock

a

First-come, first- served (FCFS) is the simplest device-scheduling algorithm. A) True B) False

a

For ____ systems, deadlocks quickly become critical situation s. A) batch B) interactive C) real-time D) general purpose

d

How many percent of the CPU time is wasted, when a computer system has enough room to hold two program and these programs are idle waiting for I/O 10% of the time? [A] 90% [B] 99% [C] None of the other choices [D] 1 %

c

If a particular demand paging configuration has 9 page interrupts out of 11 page requests, failure rate is ____. A) 18% B) 52% C) 82% D) 95%

c

If the transport speed for a magnetic tape is 200 inches per second and the density is 1600 bpi, a total of ____ bytes can be transferred in one second. A) 3,200 B) 32,000 C) 320,000 D) 3,200,000

a

If there are 64 pages and the page size is 2048 words, what is the length of logical address? [A] 17 bits [B] 15 bits [C] 16 bits [D] 14 bits

a

In a single -user system, jobs are processed ____. A) sequentially B) intermittently C) randomly D) in order of longest job to shortest job

b

In a symmetric configuration, processor scheduling is ____. A) centralized B) decentralized C) multifaceted D) balanced

a

In second-generation computers, to reduce the discrepancy in speed between the I/O and the CPU, an interface called the ____ was placed between them to act as a buffer. A) control unit B) scheduler C) holder D) buffer manager

b

In the "dining philosophers" problem, a philosopher can pick up a fork when____. A) there is one available B) there are two available C) no other philosopher is eating D) it is his turn, going in numerical order from one philosopher to the next

c

Interactive systems generally improve the use of resources through ____ resource sharing, but this resource sharing capability also increases the possibility of deadlocks. A) interspersed B) group C) dynamic D) static

b

Most current operating systems support the implementation of threads, or ____, which have become part of numerous application packages. A) parallel processes B) lightweight processes C) heavyweight processes D) semaphores

b

Movable-head magnetic disks, such as the computer hard drive, have ____ read/write head(s). A) zero B) one C) two D) four

d

One of the most important innovations of demand paging was that it made ____ feasible. A) memory demand B) virtual demand C) virtual paging D) virtual memory

d

Operations on semaphore s enforce the concept of ____, which is necessary to avoid having two operations attempt to execute at the same time. A) mutual execution B) mutex execution C) signal exclusion D) mutual exclusion

b

Parallel processing is also called ____. A) uniprocessing B) multiprocessing C) shared processing D) divided processing

d

Powerful microcomputers developed for use by commercial, educational and government enterprises are called ____. A) supercomputers B) minicomputers C) terminals D) workstations

a

Studies have shown that having any ____, even a small one, can substantially improve the performance of the computer system. A) cache B) memory block C) page block D) block

a

The ____ contains the value that must be added to each address referenced in the program s will be able to access the correct memory addresses after relocation. A) busy list B) compaction monitor C) relocation register D) bounds register

c

The ____ of memory, sometimes referred to as garbage collection or defragmentation, is performed by the operating system to reclaim fragmented sections of the memory space. A) deallocation B) redirection C) compaction D) reallocation

c

The cache hit ratio is ____, if the total number of requests is 10 and 6 of those are found in cache memory. A) 6% B) 10% C) 60% D) 100%

a

The fixed partition scheme works well ____. A) when jobs have the same size B) when jobs have different sizes C) when job sizes are not known in advance D) when all jobs are under 100K

c

The is the essential component ofthe operating system that remains in RAM whe n your computer is powered on. [A] registr y [C] kernel [D] system file

c

The language ofthe CPU is known as its [A] Register set [B] Control unit set [C] I Instruction set | [D] None ofthe other choices

d

The name for the nucleus of an operating system is the ____. A) manager B) center C) core D) kerneld

b

The need for algorithms to resolve conflicts between processors is called process ____. A) communication B) synchronization C) reduction D) transformation

a

The operating system can tell the ____ of each group of digits by its location in the line and the operation code. A) function B) value C) order D) assignment

b

The primary distinguishing characteristic of modern computers is ____. A) memory capacity B) processor capacity C) disk space D) physical size

b

There are ____ entries per page in the PMT. A) 0 B) 1 C) 2 D) 5

a

To put data on an optical disc requires a high -intensity laser beam, which burns indentations, called pits, and flat areas, called ____. A) lands B) valleys C) hills D) lakes

c

To specify an address in this segmented memory, the form is used [A] <physical address, offset> [B] <process, offset> c <segment-number, offset> [D] <virtual address, offset>

c

Vacuum tube computers were used during the period of ____. A) 1920s-1930s B) 1935-1945 C) 1940-1955 D) 1945-1960

c

What is an operating system structure in which the communication between requesting process and responding process is message passing? [A] Monolithic Systems [B] All of the other choices [C] MS-DOS [D] Client-Server Model

a

When there is an excessive amount of page swapping between main memory and secondary storage, the operation becomes inefficient, which is calle d . [A] thrashing [B] Over swapping [C] hot swapping [D] excessive demand paging

c

When there is an excessive amount of page swapping between main memory and secondary storage, the operation becomes inefficient, which is called ____. A) excessive demand paging B) hot swapping C) thrashing D) overswapping

b

When using the clock page replacement policy, a page with a reference bit of ____ is replaced. A) -1 B) 0 C) 1 D) 5

d

Where is the position of the operating system in computer system: [A] Between the user interface program and the application Program [B] None of the other choices [C] In user space [D] Above the hardware and under the user interface program

b

Which conditions of mutual exclusion does the Lock Variables (Software proposal) violate? [A] No process must wait forever to enter its critical region [B] No two processes simultaneously in critical region [C] No process running outside its critical region may block another process [D] No assumptions made about speeds or numbers of CPUs

a

Which is not a goal of a sheduling algorithm for all systems? [A] Balance [B] Response time [C] Policy enforcement [D] Fairness

b

Which of the following conditions that causes the processes to be terminated, when processes have done their work? [A] Fatal error (involuntary) [B] Normal exit (voluntary) [C] Killed by another process (i nvoluntary) [D] Error exit (voluntary)

a

Which of the following is an Operating System component? [A] Process Management m Speed Management [C] Space Management [D] Time Management

a

Which of the following is not a CPU scheduling criterion? [A] Burst time [B] CPU utilization [C] Throughput [D] Response time

c

Which of the following statements is incorrect about Translation Look-aside Buffer (TLB)? [A] None of the other choices [B] A TLB is sometimes known as an associative memory [C] A TLB miss implies a disk operation will follow [D] Each entry of a TLB contains the information about one page, including the virtual page number and the corresponding page frame

c

____ developed the Banker's Algorithm. A) Havender B) Holt C) Dijkstra D) Lane & Mooney

b

____ gives users the appearance that their programs are being completely loaded in main memory during their entire processing time. A) Segmenting B) Virtual memory C) Shared memory D) Multithreading

a

____ introduced the need for control cards, which defined the exact nature of each program and its requirements. A) Job scheduling B) Control scheduling C) Job control D) Structure control

a

____ is a way to optimize search times by ordering the requests once the read/write heads have been positioned. A) Rotational ordering B) SSTF C) C-SCAN D) LOOK and SCAN

a

____ is necessary in any computer system because some resources such as memory, CPU, and dedicated devices must be exclusively allocated to one user at a time. A) Mutual exclusion B) Resource holding C) No preemption D) Circular wait

c

____ is when, in modern printing systems, a disk accepts output from several users and acts as a temporary storage area for all output until the printer is ready to accept it. A) Phishing B) Lagging C) Spooling D) Spoofing

c

____ occurs when two processes do not release control of resources they are using. A) No preemption B) Circular wait C) Resource holding D) Mutual exclusion

a

____ proposed a solution to the readers and writers problem that did not result in starvation for readers or writers. A) Hoare B) Courtois C) Heymans D) Parnas

d

he ____ policy is based on the theory that the best page to remove is the one that has been in memory the longest. A) TRU B) LRU C) LIFO D) FIFO

d

he basic idea behind the microkernel design is: [A] All ofthe other choices [B] All other modules run as relatively powerless o rdinary user processes [C] Only one module runs in kernel mode [D] To archive high reliability by splitting operating system up into small, well - defined modules

b

he data-transfer rate for an optical disc is measured in ____ per second and refers to the speed at which massive amounts of data can be read from the disc. A) kilobytes B) megabytes C) gigabytes D) terabytes

a

inux and are often used as operating systems on supercomputers, mainframes, and servers. [A] UNIX [B* Windows [C] None ofthe other choices [D] Mac OS

b

o access a location in memory when using segmented memory management, the address is composed of two entries: ____. A) the segment number and the line number B) the segment number and the displacement C) the line number and the displacement D) the segment number, the line number, and the displacement

a

ry in any computer system because some resources such as memory, CPU, and dedicated devices must be exclusively allocated to one user at a time. A) Mutual exclusion B) Resource holding C) No preemption D) Circular wait

c

utilization when these programs are idle waiting for I/O 20% of the time? 4% 90% [C] None of the other choices [D] 96%