Which of these is NOT an operating system ?
Answer: D
Correct answer: Oracle
Oracle is a relational database management system, an application that runs on top of an operating system. Linux, Unix and Windows all manage the hardware directly and provide the environment in which such applications execute.
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The working set theory of programming behaviour of processes running within an operating system involves
Answer: A
Correct answer: the collection of pages that a process accesses
The working set of a process is the set of pages it has referenced in the recent past, taken as a prediction of what it will need next. Keeping a process’s whole working set resident stops it faulting continually, and refusing to run a process whose working set will not fit is how thrashing is prevented.
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The principles of structured programming forbid the use of
Answer: B
Correct answer: GOTO
Structured programming builds a program from sequence, selection and iteration, each with one entry and one exit, and forbids the GOTO, whose arbitrary jumps destroy that property and make the flow impossible to follow. IF-THEN-ELSE, WHILE-DO and DO-WHILE are the permitted constructs.
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A relationship between processes such that each has some part (critical section) which must not be executed while the critical section of another is being executed, is known as
Answer: B
Correct answer: mutual exclusion
Mutual exclusion is the requirement that no two processes be inside their critical sections at the same time, so that a shared resource is never updated by two of them at once. A semaphore is one mechanism for enforcing it, not the property itself.
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To view any currently running Terminate Stay Resident (TSR's) programs you could type:
Answer: B
Correct answer: MEM
MEM reports memory usage and, with a switch, lists the resident programs occupying it.
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What command is used to reset a MODEM when using the "AT Command Set"?
Answer: B
Correct answer: ATZ
ATZ resets the modem to its stored profile. Every command in the set begins with the attention prefix AT.
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Poor response times are caused by
Answer: D
Correct answer: Any of the above
Response time suffers wherever the bottleneck lies. A saturated processor leaves work queuing for the CPU; a high input/output rate leaves it queuing for a device; a high paging rate leaves it queuing for memory. Any one of them alone will lengthen response times.
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HIMEM.SYS controls:
Answer: D
Correct answer: Extended Memory
HIMEM.SYS is the extended memory manager: it takes charge of the memory above 1 MB and hands it out through the XMS interface, which is why it must be loaded before EMM386, SMARTDRV or DOS=HIGH can do anything.
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The term "operating system" means
Answer: A
Correct answer: a set of programs which controls computer working
An operating system is the body of programs that controls the machine - scheduling the processor, allocating memory, managing files and driving devices - and presents that machine to users and to other programs. Translating a high-level language is the compiler’s work.
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A page fault
Answer: C
Correct answer: is an access to a page not currently in memory
A page fault is the trap raised when a program references a page that is not resident: the hardware interrupts, the operating system finds the page on disk, brings it into a free frame - evicting another page if necessary - updates the page table and restarts the instruction. It is a normal event in a paged system, not an error.
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