Bsc CSIT Semester 4 – Operating System – Unit 1: Operating System Overview (4 Hrs.)

Question 1

Define the essential properties of the following types of operating systems: - a) Batch - b) Interactive - c) Time sharing - d) Real time - e) Handheld

Marks: 5

Year: 2070 Final TU

Types of Operating Systems and Their Essential Properties a) Batch Operating System - Definition: Executes a group of jobs (batch) without user interaction. - Properties: - No direct user inter

Question 2

What are the differences between a trap and an interrupt? What is the use of each?

Marks: 5

Year: 2070 Final TU

Differences Between Trap and Interrupt | Feature | Trap | Interrupt | |------------------------|-------------

Question 3

How operating is as a resource manager? Explain.

Marks: 5

Year: 2071 Final TU

Operating System as a Resource Manager 1. Definition An Operating System (OS) acts as a resource manager by efficiently allocating and controlling all hardware and software resources of a computer sy

Question 4

How physical address is generated from logical address? Explain the process of system call with suitable diagram.

Marks: 10

Year: 2072 Final TU

✅ Logical to Physical Address Translation & System Call (10 Marks) 1. Logical vs Physical Address - A logical address (also called virtual address) is generated by the CPU during program execution. -

Question 5

What is an operating system? Differentiate between time sharing and real time operating system.

Marks: 5

Year: 2072 Final TU

What is an Operating System? An Operating System (OS) is a system software that works as an interface between the user and the computer hardware. It manages hardware resources (CPU, memory, I/O devi

Question 6

What are two modes of OS? Discuss different OS structures briefly.

Marks: 5

Year: 2076 Final TU

Two Modes of Operating System Modern operating systems work in two modes to ensure security and proper control over system resources: 1. User Mode - Application programs run in this mode (e.g., bro

Question 7

Differentiate between multi programming and Monoprogramming. What will be the CPU utilization with 6 processes with 60% IO waiting time are in memory?

Marks: 5

Year: 2076 Final TU

Difference between Multiprogramming and Monoprogramming Monoprogramming - Only one program/process is loaded and executed by the CPU at a time. - If that process does I/O and waits, the CPU stays idle

Question 8

What is system call? Discuss process of handling system calls briefly.

Marks: 5

Year: 2078 Final TU

System Call in Operating System 1. Definition: - A system call is a request made by a user-level program to the operating system (kernel) to perform a task that the program cannot execute directly. -

Question 9

Explain microkernels and exokernels.

Marks: 5

Year: 2081 Final TU

Microkernels and Exokernels (5 Marks) Microkernel A microkernel is an operating system architecture where only the most essential and basic functions are kept inside the kernel. Other services run in