Operating System

note!Answer: C) |
The pipe symbol | is used to send output to MORE, for example DIR | MORE.

note!Answer: A) Himem.SYS
HIMEM.SYS manages extended memory and the high memory area in DOS. EMM386.EXE provides expanded memory emulation.

note!Answer: B) Root directory
The root directory is created automatically when a disk is formatted, so MD cannot create it. All other directories are created inside an existing directory.

note!Answer: C) /
The forward slash (/) is reserved as a switch and path separator in DOS, so it cannot be used in a file name.

note!Answer: D) External commands
External commands are stored as separate program files on disk and must be loaded to run. Internal commands are built into COMMAND.COM.

note!Answer: B) Autoexec.bat
AUTOEXEC.BAT is a batch file that DOS runs automatically at startup. CONFIG.SYS is also a startup file but it sets system configuration.

note!Answer: B) Doskey
DOSKEY is a utility that records commands typed at the DOS prompt so they can be recalled and edited.

note!Answer: B) Diskcopy
DISKCOPY makes an exact sector-by-sector copy of an entire floppy diskette. COPY and XCOPY copy individual files.

note!Answer: B) F1
The F1 key opens help in most Windows-based programs.

note!Answer: C) /s
The /s switch with the DIR command lists files in the specified directory and all its subdirectories.

note!Answer: C) /q
The /q switch with FORMAT performs a quick format, which erases the file table without a full surface scan.

note!Answer: A) *
The asterisk (*) is a wildcard that stands for any group of characters. The question mark (?) stands for a single character.

note!Answer: A) CHDIR
CHDIR changes the current directory and does not create one. MD and MKDIR both create directories.

note!Answer: A) UNIX
The shell is a command interpreter characteristic of UNIX-like systems.

note!Answer: A) Process
A program under execution is known as a process.

note!Answer: B) Turnaround time
Turnaround time is the total time from job submission to job completion.

note!Answer: C) Transfer the system files to disk
SYS copies the DOS system files to a disk so it becomes bootable.

note!Answer: C) CD\
CD\ changes the current directory to the root (main) directory in one step.

note!Answer: C) Attrib+h
ATTRIB +H sets the hidden attribute on a file, hiding it from normal listings.

note!Answer: A) Ctrl+c
Ctrl+C (Ctrl+Break) interrupts or stops a running DOS program.