Definition : Operating System

An Operating System is an integrated collection of routines that service the sequencing and processing of programs by a computer. An operating system may provide many services, such as resource allocation, scheduling, input/output control and data management.

Development in Operating System

The first computers did not have operating systems. A user would typically load punched paper tape or cards containing a program and data directly into a tape reader or card reader which is connected to the computer. The computer then would start working and continued until the program was completed or until it crashed.

Functions of Operating Systems

The main functions of operating systems can be counted as Device Management (Storage and Input/Output Management), User Interface, House Keeping, Memory Management, Process Management.

Basic Components of Operating System

Any operating system can be divided into three sets of basic components:

a. Kernel
b. Low level Utilities and other system programs
c. User Interface

Syllabus - Computer Officer - Lok Sewa Ayog (Public Service Commission), Nepal

Syllabus of Computer Officer Examination conducted by Public Service Commission (Lok Sewa Ayog). The article contain the list of topics included as course, Model questions - objective questions, subjective questions and practical exam questions.

Subjective Question Paper 2008 (2065 B.S.) - Computer Officer - Lok Sewa Ayog (Public Service Commission)

Following is the question paper of the Computer Officer Examination of 2008 conducted by Public Service Commission (Lok Sewa Ayog).

Question paper 2063 BS or 2006 AD

Question paper of computer officer examination conducted by Public Service Commission (Lok Sewa Ayog) on 2063 BS or 2006 AD.

Disk Allocation Methods

The six major disk allocation methods are as follows:

i. Contiguous Allocation, ii. Linked List Allocation, iii. Segment Based Allocation, iv. Indexed Allocation, v. Multilevel Indexed Allocation vi. Inverted Allocation

Disk Scheduling Methods
(As it appears on computer officer syllabus 4.3.1 )

The six major disk scheduling methods are as follows:

First come first served (FCFS), SCAN, C-SCAN, LOOK, C-LOOK, shortest seek time first (SSTF)

Memory Management Strategies
(As it appears on Computer Officer Syllabus 4.3.2)

The three major memory management strategies are as follows:

(i) Contiguous Allocation, (ii) Paging, (iii) Segmentation

Contiguous Allocation

In this memory management strategy the space is allocated directly on physical memory

Virtual Memory Management Techniques
(4.3.3 as in Syllabus of Computer Officer Syllabus of Lok Sewa Ayog)

The three major memory management strategies are as follows:

(i)Contiguous Allocation, (ii) Paging and (iii) Combined Paging/Segmentation System

Joint Application Development (JAD)

Joint Application Design/Development (JAD) was developed in 1970s by Chuck Morris of IBM Releigh and Tony Crawford of IBM Toronto. They taught and led several workshops to prove the concept of JAD. Till 1980s JAD attained popularity and people started to use the term to describe different things.

Authors Needed

Computer Officer Examinaiton Preparation ( Public Service Commissxion - Lok Sewa Ayog)

Required Qualification:

Successful completion of University Bachelor's Degree in:

• Computer Science or,
• Computer Engineering or
• Mathematics/Stastics with at least 6 months Diploma Computer Course in System Analysis and Software Design