In DOS, which of the following keys will bypass the CONFIG.SYS and AUTOEXEC.BAT files?
Answer: B
Correct answer: F5
Pressing F5 as DOS starts skips CONFIG.SYS and AUTOEXEC.BAT entirely, giving a bare system - the standard way of getting in when a driver or a startup line is preventing the machine from booting. F8 instead confirms each line one at a time.
Please log in or register to report this question.
The advantage of a command processor running only built-in commands is:
Answer: B
Correct answer: the command set being common across different hardware configurations
When commands are built into the command processor they are always present, whatever machine or configuration the system is running on, so scripts and habits carry across installations. Commands held as separate files can be missing, replaced or shadowed.
Please log in or register to report this question.
The COPY command of MS-DOS, is used to:
Answer: D
Correct answer: All of the above
All three are ordinary uses of COPY: taking a file to another machine on a diskette, keeping a spare copy for safety or for the record, and copying from the hard disk to floppies. The command does not distinguish between the purposes.
Please log in or register to report this question.
Information in a memory that is no longer valid or wanted is known as
Answer: D
Correct answer: garbage
Data left in memory that is no longer valid or wanted is garbage, and reclaiming the space it occupies is garbage collection. Volatile and non-volatile describe whether memory survives a loss of power, which is a property of the hardware rather than of the data.
Please log in or register to report this question.
What is the name of the technique in which the operating system of a computer executes several programs concurrently by switching back and forth between them?
Answer: B
Correct answer: Multitasking
Multitasking gives each program a short turn on the processor and switches rapidly between them, saving and restoring the state each time, so that all appear to run at once. Paging and partitioning divide memory rather than processor time.
Please log in or register to report this question.
Memory management is :
Answer: D
Correct answer: critical for even the simplest operating systems
Every operating system must decide where each program’s code and data will sit, keep them from overwriting one another, and reclaim the space afterwards - that is memory management, and even a single-user system needs it. Virtual memory is one technique of memory management, not a replacement for it.
Please log in or register to report this question.
While working with MS-DOS, which command is used to restore only those files modified since the last backup, from the drive A to the currently logged drive or directory?
Answer: B
Correct answer: RESTORE A: *.*/M
The /M switch restores only those files that have been modified since they were backed up - the ones whose disk copy differs from the backup - leaving everything else untouched.
Please log in or register to report this question.
A base register table
Answer: B
Correct answer: is used to remember which of the general-purpose registers are currently available as base registers
The System/370 forms every address from a base register plus a displacement, so the assembler must know which registers currently hold base addresses and what they point at. The base register table records exactly that, and the assembler consults it to choose a base and compute the displacement for each symbolic reference.
Please log in or register to report this question.
Suppose you had an incurable computer virus and decided to wipe out all the data and partitions on your hard drive and reformat. What is the order in which you must delete the partitions?
Answer: C
Correct answer: Logical, Extended, Primary
Partitions must be removed from the inside outwards: the logical drives live inside the extended partition, so they go first; the now-empty extended partition can then be deleted; and the primary partition last. FDISK refuses any other order.
Please log in or register to report this question.
What is the name given to all the programs inside the computer with makes it usable?
Answer: B
Correct answer: System software
System software is everything that makes the machine usable in itself - the operating system, its device drivers, utilities, compilers and loaders. Application software runs on top of it to do the user’s own work.
Please log in or register to report this question.
