You should save your computer from ?
Answer: D
Correct answer: All of the above
All three are hostile programs a machine must be defended against: a virus attaches itself to a file or boot sector and spreads when that is used; a worm propagates across a network by itself; and a time bomb lies dormant until a set date and then does its damage.
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Which CPU scheduling algorithm may cause a low-priority process to starve indefinitely ?
Answer: C
Correct answer: Priority scheduling
Under strict priority scheduling a steady stream of higher-priority arrivals can keep a low-priority process waiting forever. Ageing, which gradually raises the priority of a waiting process, is the usual remedy. Shortest Job First can starve long jobs for the same reason.
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Special software to create a job queue is called a
Answer: B
Correct answer: Spooler
A spooler accepts output destined for a slow device, writes it to a queue on disk, and feeds it to the device later. The program that produced it is released at once, and the queued jobs are printed in turn.
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Addressing modes
Answer: B
Correct answer: are variations in the use of fundamental addressing structures
The addressing structure defines how an effective address is formed in principle; the addressing modes are the particular variations offered - direct, indirect, indexed, base-relative, immediate, auto-increment. Each mode is one way of applying the underlying structure.
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Which command is executed before the others when a computer is first turned on?
Answer: B
Correct answer: Device=c:\dos\himem.sys
HIMEM.SYS must be loaded before anything that uses memory above 1 MB, because it is the extended memory manager that hands that memory out - EMM386, SMARTDRV and DOS=HIGH all depend on it. It therefore comes first in CONFIG.SYS, which itself is read before AUTOEXEC.BAT.
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The initial value of the semaphore that allows only one of the many processes to enter their critical sections, is
Answer: B
Correct answer: 1
A semaphore guarding a critical section is initialised to 1: the first process to execute wait() takes the count to 0 and enters, and any other process then blocks until the first calls signal(). That is a binary semaphore, or mutex, and it is what enforces mutual exclusion.
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Where do you load the CD Rom drivers?
Answer: D
Correct answer: Config.sys
The hardware driver for a CD-ROM drive is a .SYS file loaded by a DEVICE= line in CONFIG.SYS. MSCDEX.EXE, which gives the drive its letter and its file system, is run afterwards from AUTOEXEC.BAT.
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An algorithm is best described as
Answer: B
Correct answer: A step by step procedure for solving a problem
An algorithm is a finite, ordered sequence of unambiguous steps that solves a problem, each step effective and the whole guaranteed to terminate. It is independent of any programming language, and can be written in plain words or drawn as a flowchart before it is coded.
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You can reset the wrong displayed system of time and dates by using ?
Answer: D
Correct answer: Control panel
The system clock is set from the Control Panel’s date and time settings - or by double-clicking the clock in the taskbar, which opens the same dialog. Write is a text editor and Calendar merely displays dates.
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The CPU, after receiving an interrupt from an I/O device
Answer: D
Correct answer: branches off to the interrupt service routine after completing the current instruction
The processor checks for pending interrupts at the end of each instruction, not in the middle of one - the machine state must be consistent before it can be saved. It then saves the program counter and status, branches to the service routine, and resumes the interrupted program afterwards.
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