Disk Operating System (DOS) – Section 3

26. Filename extensions help identify certain files. What filename extension identifies executable files?

A. INF
B. PRO
C. EXE
D. SYS
E. None of the above

Correct Answer: C. EXE

27. Which combination of keys allows you to perform a warm boot?

A. Ctrl+ESC
B. Ctrl+Alt+DEL
C. Ctrl+Shift+DEL
D. Ctrl+Shift+ENTER
E. None of the above

Correct Answer: B. Ctrl+Alt+DEL

28. You suspect that your automatic modem dialer is not working correctly. Which of the following commands will manually dial the number 123- 4567?

A. AT1234567
B. ATDT1234567
C. AT1234567DL
D. ATM 1234567
E. None of the above

Correct Answer: B. ATDT1234567

29. Which command is used to copy all files from drive A with extension .TXT to the currently logged drive and directory?

A. COPY a: *.TXT
B. COPY *.TXT A:
C. COPY *.TXT C:
D. COPY *.TXT ALL.TXT
E. None of the above

Correct Answer: A. COPY a: *.TXT

30. While working with MS-DOS, which command is used to switch to the monochrome display from color display?

A. MODE BLACK
B. MODE B/W
C. MODE MONO
D. MODE CO40
E. None of the above

Correct Answer: C. MODE MONO

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