Disk Operating System (DOS) Question:
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While working with MS DOS which command is used to change the extension of all file names ending with .txt to doc?

a. Ren *.doc *.txt
b. Ren .txt .doc
c. Ren file.doc file.text
d. Ren a:*.doc *.doc

Answer:

a. Ren *.doc *.txt

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Which of the following file menu option saves document to disk?

a. Save
b. Create
c. Rename
d. All of above		Booting means:

a. Restarting computer
b. Installing program
c. Removing errors
d. Switch off