Computer Operating System Questions and Answers

Answer: C

Correct answer: latency plus seek time

Preparing the mechanism means getting the head to the data: the seek time to move the arm to the right track, then the rotational latency until the sector arrives beneath it. Only after that does the transfer begin, so transmission time is not part of the preparation.

Answer: B

Correct answer: D

Primary partitions are lettered first, in drive order, so the first drive's primary is C and the second drive's primary is D. The logical drives inside the extended partitions follow.

Answer: B

Correct answer: DELTREE/F

DELTREE deletes a directory with everything beneath it and normally asks for confirmation first; the /F switch suppresses that prompt so the command can run unattended in a batch file.

Answer: A

Correct answer: A program is a passive set of instructions while a process is a program in execution

A program is a file on disk and does nothing on its own; a process is that program loaded into memory with its own program counter, registers, stack and allocated resources. One program can give rise to many simultaneous processes.

Answer: A

Correct answer: passwords

The password remains the commonest security mechanism: every system has one, it needs no extra hardware, and it costs nothing to deploy. Encryption and firewalls protect data in transit and networks at their boundary, but neither is as universally applied as the password.

Answer: A

Correct answer: is a method of memory allocation by which the program is subdivided into equal portions or pages

Paging divides the address space into fixed-size pages and memory into frames of the same size, so any page can go in any free frame. Because the pieces are all the same size there is no external fragmentation, and a program need not occupy contiguous memory.

Answer: D

Correct answer: all of the above

A file system must let users name their files freely, keep those files reliably for as long as they are wanted, and protect them against loss from system failure and against access by people not entitled to them. All three are among its functions.

Answer: A

Correct answer: to recognize the major constructs of the language and to call the appropriate action routines

The syntax phase takes the token stream from the lexical phase and parses it against the grammar, recognising declarations, expressions and statements, and calling the action routine that handles each construct as it is identified. Building the symbol, literal and uniform symbol tables is lexical-phase work.

Answer: C

Correct answer: is a sequence of instructions

A program is a sequence of instructions written to accomplish a task. It is passive - a file until it is loaded and run. The device that executes it is the processor, and the place it is kept is memory.

Answer: C

Correct answer: MD

MD - or its full form MKDIR - creates a directory. RD removes one and CD changes to one; DIR merely lists what a directory contains.