List-I A. User-Level Threads B. Kernel-Level Threads C. Many-to-One Model D. One-to-One Model List-II Kernel handles all management; context switches require traps Managed via a library in user space without kernel awareness Many user threads map to one kernel thread; block risk high Each user thread maps to its own individual kernel target

A-2, B-1, C-3, D-4 Explanation: A. User-Level Threads -> 2: User-level threads are supported above the kernel and are managed by a thread library in user space without any direct kernel support or awareness. B. Kernel-Level Threads -> 1: Kernel-level threads are supported directly by the operating system kernel. The kernel handles thread creation, scheduling, and management, so switching between threads requires a trap into kernel mode. C. Many-to-One Model -> 3: In this multithreading model, multiple user-level threads are mapped to a single kernel thread. If one user-level thread makes a blocking system call, the entire process/kernel thread blocks. D. One-to-One Model -> 4: In this model, each user-level thread is mapped to an individual kernel thread, allowing better concurrency since another thread can run if one pe

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CUET PG 2026 — operating system os PYQ

CUET PG | operating system os | 2026

List-I

A. User-Level Threads

B. Kernel-Level Threads

C. Many-to-One Model

D. One-to-One Model

List-II

Kernel handles all management; context switches require traps

Managed via a library in user space without kernel awareness

Many user threads map to one kernel thread; block risk high

Each user thread maps to its own individual kernel target

Choose the correct answer: