List-I A. Mode Bit = 0 B. Mode Bit = 1 C. Trap D. Privileged Instruction List-II User Mode execution Kernel Mode execution Software-generated interrupt caused by error or request Can execute only when the CPU is running in kernel mode

A-2, B-1, C-3, D-4 Explanation: A. Mode Bit = 0 2 (Kernel Mode execution) : A mode bit value of 0 indicates that the CPU is executing in Kernel Mode (also known as Supervisor, System, or Monitor mode), granting full access to hardware and privileged instructions. B. Mode Bit = 1 1 (User Mode execution) : A mode bit value of 1 indicates that the system is executing in User Mode , where direct hardware access is restricted to protect the operating system. C. Trap 3 (Software-generated interrupt caused by error or request) : A trap (or exception) is a software-generated interrupt triggered either by an error (e.g., division by zero, invalid memory access) or a user request (e.g., a system call execution). D. Privileged Instruction 4 (Can execute only when the CPU is running in kernel mode) : Privileged instructions (like I/

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CUET PG 2026 — operating system os PYQ

CUET PG | operating system os | 2026

List-I

A. Mode Bit = 0

B. Mode Bit = 1

C. Trap

D. Privileged Instruction

List-II

User Mode execution

Kernel Mode execution

Software-generated interrupt caused by error or request

Can execute only when the CPU is running in kernel mode

Choose the correct answer: