Disk Operating System Questions and Answers
The Disk Operating System (DOS) forms the foundation of many modern computing systems. These programming questions and answers on DOS cover essential topics like file management, command-line utilities, memory organization, and system architecture. Mastering DOS is crucial for computer science students and aspirants appearing for TCS, Wipro, Tech Mahindra, and other placement exams. Practicing operating system MCQs with explanations strengthens your understanding of basic system-level concepts and command syntax. Learn how DOS interacts with hardware and manages files efficiently through Disk Operating System questions with answers, an important topic in both academic and technical interview preparation.
Disk Operating System
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39 questions
21. You suspect a virus has entered your computer. What will not be affected by the virus?
- CMOS
- Boot sector
- Floppy disks
- Program files
22. What is a TSR?
- test status request
- terminate and stay resident program
- take status request
- token set ready
23. What does MSCDEX.EXE do?
- Configures hard drives
- it's a SCSI driver
- BIOS setup
- it's a CD-ROM DOS driver
24. Upper Memory blocks are located where?
- Conventional Memory
- Extended Memory
- Expanded memory
- Reserved Memory
25. Batch files contain a group of MS-DOS commands that are run in successive order. What filename extension identifies batch files?
- COM
- BAT
- EXE
- SYS
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?
- Use the DOS+ command
- Use the SETVER command
- Restore the old DOS version
- Contact the application's vendor support line
27. When executed from a bootable hard drive, which command will make a formatted floppy disk bootable?
- COPY C:\DOS\COMMAND.COM A:\
- ATTRIB C:\*.SYS A:\
- XCOPY C:\DOS\*.* A:\
- SYS C: A:
28. While working with MS-DOS, which command is used to specify the colour display, 40 columns and color?
- MODE COLOUR
- MODE/C
- MODE CO40
- MODE CHANGE
29. Which DOS command allows you to compress existing disks and to create new compressed volumes?
- DEFRAG
- DBLSPACE
- SCANDISK
- MSAV
30. The MODE command of MS-DOS is used to
- display information about several types of devices installed in your computer
- provide various types of control over your printers
- make changes of the current display
- All of the above