Which command is used to display the subdirectory structure of the currently logged drive and pause the screen display after each screenful of information?
Answer: D
Correct answer: TREE | MORE
TREE draws the directory structure of the drive, which is usually far longer than a screen, so its output is piped into MORE to pause after each screenful.
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If you do not know the current time, which command will you use to display the time?
Answer: C
Correct answer: TIME
TIME displays the current time and offers to change it; typed with a value it sets the clock directly. DATE does the same for the date.
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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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Which combination of keys allows you to perform a warm boot?
Answer: B
Correct answer: Ctrl+Alt+DEL
Ctrl + Alt + Del restarts DOS without switching the power off - a warm boot, which skips the memory test and much of the hardware initialisation and so comes back much sooner than a cold start.
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You suspect that your automatic modem dialer is not working correctly. Which of the following commands will manually dial the number 123-4567?
Answer: B
Correct answer: ATDT1234567
Modems obey the Hayes command set: AT gets the modem’s attention, D means dial and T selects tone dialling, so ATDT1234567 dials that number. ATDP would dial it with pulses.
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Which command is used to copy all files from drive A with extension .TXT to the currently logged drive and directory?
Answer: A
Correct answer: COPY a: *.TXT
With the source given as A:*.TXT and no destination, COPY writes to the current drive and directory, keeping each file’s name - which is exactly what the question asks for.
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While working with MS-DOS, which command is used to switch to the monochrome display from color display?
Answer: C
Correct answer: MODE MONO
MODE MONO switches output to the monochrome adapter. The related settings are CO40 and CO80 for colour and BW40 and BW80 for a colour adapter driving a monochrome display.
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Which command, whose long form is CHDIR, enables you to move between directories?
Answer: A
Correct answer: CD
CD changes the current directory, and CHDIR is simply its longer spelling - the same command under two names. MOVE relocates files rather than changing where you are.
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The autoexec.bat configuration file
Answer: A
Correct answer: Is run after config.sys on system boot-up
AUTOEXEC.BAT is a batch file of ordinary commands, so it can only run once COMMAND.COM has been loaded - which happens after CONFIG.SYS has been read and its drivers installed. That is why drivers go in CONFIG.SYS and commands such as PATH and SET go in AUTOEXEC.BAT.
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Which is LEAST likely to interfere with upgrading to a newer DOS version?
Answer: B
Correct answer: Video controller
A DOS upgrade touches the system files, the disk structures and the drivers, so the ROM BIOS, compressed drives and old backups can all cause trouble. The video controller is driven through the BIOS and is indifferent to which version of DOS is running, so it is the least likely to interfere.
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