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Question 28

Computer Awareness Introduction to Operating Systems Medium

Arrange the following layers of MS DOS operating system starting from inner most to outer most. $$ \text{ (A). ROM BIOS Device drivers } $$ $$ \text{ (B). Resident System Program } $$ $$ \text{ (C). MS DOS Device Drivers } $$ $$ \text{ (D). Application Program} $$

(A) (A), (C), (B), (D)
(B) (D), (B), (C), (A)
(C) (B), (A), (D), (C)
(D) (C), (B), (D), (A)
View Dynamic Solution & Explanation ▼
Correct Solution: Option A

Step-by-step Solution:

Solution:

The layers of the MS-DOS operating system from the innermost to the outermost are:

  1. (A) ROM BIOS Device drivers – These are the lowest-level drivers stored in ROM that directly interact with the hardware.
  2. (C) MS-DOS Device Drivers – These drivers are loaded by MS-DOS during boot and extend the hardware control provided by BIOS.
  3. (B) Resident System Program – The core of MS-DOS (command interpreter and kernel) which manages the system operations.
  4. (D) Application Program – User-level programs that run on top of MS-DOS, depending on the lower layers.

Therefore, the correct sequence is:

✅ (A) → (C) → (B) → (D)

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