Ch 15: 32-Bit Protected Mode Architecture

Covers transitioning from 16-bit real mode to 32-bit protected mode, setting the PE bit in CR0, constructing 8-byte segment descriptors (base, limit, access rights), and hardware memory protection rings (Ring 0 vs Ring 3).

173 Questions173 MCQs0 Short Questions0 Long Questions

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CS401 - Computer Architecture and Assembly Language Programming Examination Practice

Timed practice exam simulation for CS401 - Computer Architecture and Assembly Language Programming.

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Q121

❓ MCQ📘 CS401📑 Lec 15🏷️ Hard Disk Master Boot Record (MBR) Sector SizeEasy⭐💡📄🎓VU🏛️VU

The Master Boot Record (MBR) stored on the first sector (Sector 1, Head 0, Track 0) of a hard disk has a total size of:

A.446 bytes
B.350 bytes
C.512 bytes
D.256 bytes

Q122

❓ MCQ📘 CS401📑 Lec 15🏷️ FAT File System 32-Byte Directory Entry StructureEasy⭐💡📄🎓VU🏛️VU

In FAT12, FAT16, and FAT32 file systems, a standard directory entry consists of how many bytes?

A.16
B.24
C.32
D.64

Q123

❓ MCQ📘 CS401📑 Lec 15🏷️ Operating System File ConceptEasy⭐💡📄🎓VU🏛️VU

Operating systems fundamentally organize and store persistent data on disk media in the form of:

A.Folder
B.Batch file
C.File
D.None of the above

Q124

❓ MCQ📘 CS401📑 Lec 15🏷️ RS-232 DB-9 Serial Port Pinout (Signal Ground Pin 5)Easy🔁⭐💡📄🎓VU🏛️VU

On a standard 9-pin DB-9 RS-232 serial connector, which pin number is assigned to Signal Ground (GND)?

A.Pin 3
B.Pin 4
C.Pin 5
D.Pin 6

Q125

❓ MCQ📘 CS401📑 Lec 15🏷️ Program Segment Prefix (PSP) Size (256 Bytes)Easy🔁⭐💡📄🎓VU🏛️VU

In DOS executable architecture, what is the total size of the Program Segment Prefix (PSP) structure placed in memory immediately preceding a loaded.COM program?

💻 assembly Snippet

org 0x100  ; Skip 256-byte PSP

A.64 bytes
B.128 bytes
C.256 bytes (0x100 bytes)
D.512 bytes

Q126

❓ MCQ📘 CS401📑 Lec 15🏷️ Hardware Handshaking and CommunicationEasy🔁⭐💡📄🎓VU🏛️VU

The hardware or software process of sending control signals back and forth between communicating devices to coordinate data transmission is called:

A.Programming
B.Activity
C.Interruption
D.Handshaking / Hardware Communication

Q127

❓ MCQ📘 CS401📑 Lec 15🏷️ Master Boot Record (MBR) Sector SizeEasy🔁⭐💡📄🎓VU🏛️VU

The Master Boot Record (MBR) stored on the first sector of a hard disk has a total size of:

A.446 bytes
B.350 bytes
C.512 bytes
D.256 bytes

Q128

❓ MCQ📘 CS401📑 Lec 15🏷️ Master Boot Record (MBR) Location on Hard DiskEasy🔁⭐💡📄🎓VU🏛️VU

The very first sector (Head 0, Track 0, Sector 1) on a partitioned hard disk contains the:

A.Master Boot Record (MBR)
B.Boot Sector
C.File Allocation Table (FAT)
D.Root Directory

Q129

❓ MCQ📘 CS401📑 Lec 15🏷️ BIOS INT 13h Error Code Return Register (AH)Medium⭐💡📄🎓VU🏛️VU

When invoking BIOS INT 13h disk services, which CPU register receives and returns the status / error code if an operation fails?

💻 assembly Snippet

mov ah, 0x02  ; Read disk sectors
int 0x13
; If CF=1, AH contains error status code

A.CF (Carry Flag)
B.DL
C.AH
D.AL

Q130

❓ MCQ📘 CS401📑 Lec 15🏷️ Operating System File OrganizationEasy🔁⭐💡📄🎓VU🏛️VU

Operating systems organize and store data on disk storage media in the form of:

A.Folders
B.Batch files
C.Files
D.None of the above

Ch 15: 32-Bit Protected Mode Architecture

CS401 - Computer Architecture and Assembly Language Programming Examination Practice

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