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26. 

After upgrading your computer to a new DOS version, an older application displays the error message "Incorrect DOS version". What should you do to run this application?
A. Use the DOS+ command
B. Use the SETVER command
C. Restore the old DOS version
D. Contact the application's vendor support line
E. None of the above
27. 

When executed from a bootable hard drive, which command will make a formatted floppy disk bootable?
A. COPY C:\DOS\COMMAND.COM A:\
B. ATTRIB C:\*.SYS A:\
C. XCOPY C:\DOS\*.* A:\
D. SYS C: A:
E. None of the above
28. 

Which of the following commands allows you to make a directory?
A. MAKE
B. DIR
C. MD
D. DD
E. None of the above
29. 

While working with MS-DOS, which command is used to specify the colour display, 40 columns and color?
A. MODE COLOUR
B. MODE/C
C. MODE CO40
D. MODE CHANGE
E. None of the above
30. 

Which DOS command allows you to compress existing disks and to create new compressed volumes?
A. DEFRAG
B. DBLSPACE
C. SCANDISK
D. MSAV
E. None of the above