Which among the following operating system does not implement the multitasking truly ?
Answer: D
Correct answer: MS DOS
MS-DOS is single-tasking: it runs one program at a time and offers no scheduler, which is why background behaviour had to be faked with terminate-and-stay-resident tricks. Windows 98, NT and XP all schedule several processes genuinely concurrently.
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You suspect that your automatic modem dialer is not working correctly. Which of the following commands will manually dial the number 123-4567?
Answer: B
Correct answer: ATDT1234567
Modems obey the Hayes command set: AT gets the modem’s attention, D means dial and T selects tone dialling, so ATDT1234567 dials that number. ATDP would dial it with pulses.
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Using the _____ switch causes FDISK to display the partition status of your hard disk without executing FDISK.
Answer: C
Correct answer: /status
FDISK /STATUS displays the partition table of the hard disk and exits, without entering the interactive menu where partitions can be created or deleted - a safe way to look at the layout.
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If you want to execute more than one program at a time, the systems software you are using must be capable of:
Answer: D
Correct answer: multitasking
Running more than one program at a time requires the system software to be capable of multitasking: it must hold several programs in memory, keep each one’s state, and switch the processor between them fast enough that all appear to advance together.
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Operating system is
Answer: C
Correct answer: A collection of software routines
An operating system is software: a body of routines that manage the processor, memory, files and devices, and present them to programs through system calls. It runs on the hardware and controls the input and output devices, but is neither of them.
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A disk scheduling algorithm in an operating system causes the disk arm to move back and forth across the disk surface in order to service all requests in its path. This is a
Answer: C
Correct answer: Scan
The SCAN algorithm, often called the elevator algorithm, sweeps the arm steadily from one end of the disk to the other and back, serving every request it passes on the way. It avoids the starvation of far-out requests that shortest-seek-time-first can cause, while still moving far less than first-come-first-served.
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Which command is used to copy all files from drive A with extension .TXT to the currently logged drive and directory?
Answer: A
Correct answer: COPY a: *.TXT
With the source given as A:*.TXT and no destination, COPY writes to the current drive and directory, keeping each file’s name - which is exactly what the question asks for.
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A file organization component of a VSAM file is:
Answer: D
Correct answer: all of the above
VSAM offers three file organisations: the entry-sequenced data set, where records are held in the order written; the key-sequenced data set, indexed on a key; and the relative record data set, addressed by record number. All three are components of the VSAM file organisation.
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Which are the most important features of Microsoft Windows program?
Answer: D
Correct answer: All of the above
Windows is defined by all three: overlapping windows that let several programs be seen at once, pull-down menus that put each program’s commands within reach without memorising them, and icons that stand for files and programs so they can be acted on by pointing.
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Round Robin scheduling is designed especially for which type of system ?
Answer: A
Correct answer: Time-sharing systems
Round Robin gives each process a fixed time quantum in turn, so every user gets prompt attention and no one waits behind a long job. That responsiveness is exactly what a time-sharing system needs; batch systems favour throughput instead.
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