Which of the following is not applications software?
Answer: C
Correct answer: UNIX
Word processing, spreadsheets and desktop publishing are applications - programs that do the user’s own work. UNIX is an operating system, which is system software: it manages the machine so that applications can run on it.
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While working with MS-DOS, which command is used to move file from one directory to another?
Answer: C
Correct answer: MOVE
MOVE transfers a file to another directory in one step, deleting the original after the copy succeeds. Before it existed the same thing took a COPY followed by a DEL; CP is the Unix command.
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In an absolute loading scheme, which loader function is accomplished by loader
Answer: D
Correct answer: Loading
In an absolute loading scheme the assembler has already fixed the addresses and resolved the references, so the loader has nothing to allocate, relocate or link - it simply places the program at the addresses named and transfers control. Only the loading function remains.
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What scheduling algorithm allows processes that are logical runnable to be temporarily suspended?
Answer: A
Correct answer: preemptive scheduling
Under preemptive scheduling the operating system may take the processor from a process that is still able to run - when its time slice expires or a higher-priority process becomes ready - suspending it temporarily and resuming it later. Non-preemptive scheduling waits for the process to block or finish.
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Which is a permanent database in the general model of compiler?
Answer: C
Correct answer: Terminal Table
The terminal table holds the fixed vocabulary of the language - its keywords, operators and punctuation, each with the information the compiler needs about it. It is a permanent database because it is the same for every program compiled, unlike the identifier and literal tables, which are built afresh from each source program.
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In which of the storage placement strategies a program is placed in the smallest available hole in the main memory?
Answer: A
Correct answer: best fit
Best fit searches the free list for the smallest hole large enough, so the least space is wasted on this allocation. The drawback is that the remainders it leaves are tiny and unusable, so external fragmentation builds up over time.
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The Register - to - Register (RR) instructions
Answer: C
Correct answer: which perform indicated operations on two fast registers of the machine
Register-to-register instructions take both operands from the processor’s own registers and leave the result in a register, so no memory access is needed and they are the fastest form. Storage-to-storage instructions work entirely in main memory, and register-to-storage instructions combine the two.
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The most common security failure is
Answer: A
Correct answer: carelessness by users
The commonest security failure is not technical but human - passwords written down or shared, screens left unlocked, attachments opened, procedures bypassed for convenience. Technology can only limit the damage; the weakest point is almost always the person using the system.
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Filename extensions help identify certain files. What filename extension identifies executable files?
Answer: C
Correct answer: EXE
.EXE marks an executable program - one with a relocation header, so it may exceed 64 KB and use several segments. .COM is the smaller single-segment form, .SYS a driver, and the others are not program files.
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The function(s) of the Storage Assignment is (are)
Answer: D
Correct answer: all of the above
Storage assignment reserves space for every variable the source program refers to, for the temporary locations the generated code needs to hold intermediate results, and for the literals - and it must ensure the storage is aligned to whatever boundary the machine requires. All three tasks belong to that phase.
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