(SEM IV) THEORY EXAMINATION 2023-24 OPERATING SYSTEM

This document is a B.Tech Semester IV Theory Examination Question Paper for the subject BCS401 – Operating System, conducted during the 2023–2024 academic session. It is a 70-mark, 3-hour written examination designed to evaluate students' understanding of fundamental and advanced concepts related to operating systems.

The paper contains three structured sections—A, B, and C—each targeting different levels of learning, from basic definitions to deep theoretical analysis and system-level understanding.

SECTION A – Short Answer Questions (14 Marks)

This section consists of seven short questions (2 marks each) that test basic knowledge and conceptual clarity. Topics include:

Primary function of an operating system

Definition of batch processing systems

Principle of concurrency

Process state definition

Process identification information

Resident monitor

I/O subsystem

These questions assess foundational understanding of OS architecture and basic terminology.

SECTION B – Descriptive & Comparative Questions (21 Marks)

Students must attempt any three of the five given questions. These questions require explanation, comparison, and deeper reasoning.

Topics include:

Time-sharing vs. multiprogramming operating systems

Challenges in achieving mutual exclusion in concurrency

Structure & contents of a Process Control Block (PCB)

Fixed vs. variable partition multiprogramming

Comparison of storage technologies (HDD vs SSD)

This section focuses on system design reasoning, memory management approaches, and concurrency-related principles.

SECTION C – Advanced Analytical Questions (28 Marks)

This section contains five main questions, each offering two sub-parts, and the student must attempt one from each.

These questions cover:

1. OS Types & Architectures

Difference between multiuser and multiprocessing systems

Layered architecture of operating systems

2. Concurrency, Deadlock & Mutual Exclusion

Causes, prevention, and avoidance of deadlocks

Comparison of Dekker's & Peterson’s algorithms

3. Deep Analysis of Deadlock Techniques

Prevention, avoidance, detection, and recovery

System model & conditions for deadlock occurrence

4. Memory Management

Principles of paging & segmentation

Virtual memory, page tables, address translation, and demand paging

5. File System Organization

File allocation methods: contiguous, linked, indexed

Management of directory structures: hierarchical vs. flat

This section evaluates high-level understanding of modern OS design, memory mechanisms, resource allocation, and file system internals.

 Overall Purpose of the Document

This exam paper serves as a comprehensive tool to measure a student's grasp on operating system concepts, such as process management, concurrency, scheduling, memory management, deadlocks, virtual memory, and file organization. The variety of questions—definitions, comparisons, explanations, and analytical problems—ensures a balanced evaluation of both theoretical knowledge and practical system-level reasoning.