Mumbai University Solved Question Papers
Principles of Operating Systems
Previous Year Question Paper with Solution
BSc CS · Sem 3
Oct 2025 Examination
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BSc CS Sem 3 Principles of Operating Systems Oct 2025 Question Paper with Solutions
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First published on munotes.in on 16 October 2026.
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Model answers written and edited by the munotes.in editorial desk.
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The question paper reproduced here is the paper as set by the University of Mumbai at the Oct 2025 examination.
Contents
The questions below are the paper as the University of Mumbai set it at the Oct 2025 examination, in the order it was set.
MarksPage
The Paper as Set
The questions in this volume are the questions asked at the Oct 2025 examination, reproduced as the University of Mumbai set them, in the order it set them. Nothing has been reworded, added or left out. Only the answers are ours. See the original question paper.
Duration 1 hours · Total marks 30 · 12 questions answered
How to use this volume
Solve the paper first, under exam conditions and against the clock. Then read the answers here and mark your own. Reading a solution before attempting the question feels productive and teaches very little, because recognising an answer is not the same as being able to write one.
SECTION I
Q1)
Attempt any two · 10 Marks
A)Explain the role of an Operating System in a computer system.[5]
Answer
For full marks, cover: the definition, where the OS sits (between hardware and users), its role from the user's view and the system's view (resource allocator and control program), and the main jobs it does, with examples.
Definition and position
An Operating System (OS) is a program that manages the computer's hardware and provides a base on which application programs run. It acts as an intermediary between the user and the hardware. Examples: Windows, Linux, macOS and Android.
A computer system has four parts:
- Hardware: CPU, memory and I/O devices.
- Operating system: controls the hardware and coordinates its use.
- Application programs: browsers, editors, compilers.
- Users: people and other computers.
Role from the user's view
For a person at a laptop, the OS is designed for ease of use. It gives a simple interface, a GUI or a command line, so the user does not deal with hardware details. On a phone, it is designed for touch and battery life.
Role from the system's view
- Resource allocator. The OS manages the CPU time, memory space, storage and I/O devices. When many programs ask for resources at once, it decides who gets what and when, fairly and efficiently.
- Control program. The OS controls the running of programs to prevent errors and misuse. For example, it stops one program from overwriting another program's memory.
The main jobs it does
- Process management: creating, scheduling and ending processes.
- Memory management: giving memory to programs and taking it back.
- File management: creating, reading, writing and deleting files and folders.
- Device management: controlling devices through device drivers.
- Security and protection: passwords, permissions and isolation of users.
- Error detection: noticing hardware and software errors and handling them.
The part of the OS that runs all the time is the kernel. Programs ask it for services through system calls.
Conclusion. The operating system sits between the hardware and the users. It makes the computer easy to use, and it allocates resources and controls programs so that the hardware is used efficiently, safely and fairly.
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