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Previous Year Question (PYQs)

Arrange the following layers of MS DOS operating system starting from inner most to outer most. 
(A). ROM BIOS Device drivers 
(B). Resident System Program 
(C). MS DOS Device Drivers 
(D). Application Program 
Choose the correct answer from the options given below: 
1. (A), (C), (B), (D) 
2. (D), (B), (C), (A) 
3. (B), (A), (D), (C) 
4. (C), (B), (D), (A)




Solution

In MS-DOS, the layering from innermost to outermost is:

  1. ROM BIOS Device Drivers (lowest-level hardware interaction)

  2. MS-DOS Device Drivers (software drivers loaded by OS)

  3. Resident System Program (command.com, kernel parts)

  4. Application Program (user programs)

(A) , (C), (B), (D)

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