7th Class Computers Understanding Basic Concepts of Operating System Introduction to Operating System

Introduction to Operating System

Category : 7th Class

*     Introduction to Operating System

 

 

Operating system is a program which acts as an interface between a computer hardware and a user of the computer. It provides such an environment in which a user may execute programs. Basically there are two goals of an operating system, the primary goal is to make computer system convenient to use and a secondary goal is to use the computer hardware in an effective manner. OS helps in file management, program execution, system management and memory management. The internal structure of operating system is divided into three layers. The outermost layer is called user interface and innermost layer is hardware.              

 

 

 

*   The following are the main layers in OS:

  • Kernel
  • Shell
  • User Interface  

 

*  Classification of Operating System is the following: 

  • Multiprocessing: Supports in running a program on multiple CPUs.
  • Multitasking: Allows more than one program to run at the same time.
  • Multi - user: Allows more than one user to run the program at same fraction of time.
  • Multithreading : Permits all different modules of a single program to run at the same time.
  • Real - Time : Responds to input immediately.  

 

 

*  Microsoft Windows

Earlier in Microsoft Windows operating system there was no graphical interface to operate a computer and utilize its resources, user had to know the overall commands with their correct and complete syntax. Regardless of IBM's interest Microsoft continued with development of the GUI. After completion of its development, the new operating system Windows is named by Microsoft and thus in 1985 the first version is released in market.  

 

*   The following are the lists of various versions of Windows:

  • Windows 1.0  
  • Windows 2.0
  • Windows 3.x
  • Windows 95
  • Windows 98                              
  • Windows 2000
  • Windows XP                              
  • Windows Vista
  • Windows7      

 

*  List of Operating System 

  • Windows
  • MS-DOS
  • LINUX
  • UNIX
  • MAC  

 

*  Why Operating System is important

An operating system is one of the most important features of the system, without operating system we are unable to perform any task on the system. It basically provides the environment within which programs are executed. Since only the operating system can actually perform input/output user programs, it must request all such operations from the operating system.  

 

 

Question.jpg    

 

 Windows OS provides GUI and is available in various versions. Which one of the following is the latest version of Windows operating system?

(A) Windows Vista                                          

(B) Windows 7
(C) Windows 1.0                                              

(D) Windows 2000

(E) None of these  

 

Answer: (b)

Explanation

Correct Option:

(B) Windows 7 is the latest version of Windows OS.

Incorrect Options:

(A) Windows Vista is the second last version of Windows OS.

(C) Windows 1.0 is the oldest version of Windows OS.

(D) Windows 2000 was released in 17 February 2000.    

 

 

 ...................... allows more than one user to run the program at same fraction of time.  

(A) Real time                                                    

(B) Multithreading

(C) Multi-user                                                   

(D) Multitasking

(E) None of these  

 

Answer: (c)

Explanation

Correct Option:

(C) Multi-user allows more than one user to run the program at same fraction of time.

Incorrect Options:

(A) Real time responds to input immediately.

(B) Multithreading permits all different modules of a single program to run at the same time.

(D) Multitasking allows more than one program to run at the same time.    

 

 

 Microsoft launched various versions of Windows OS. Which one of the following is not a version of Windows OS?

(A) Windows 2.0                                              

(B) Windows 3.0

(C) Windows 1.0                                              

(D) Windows 3.x

(E) None of these  

 

Answer: (b)

Explanation

Correct Option:

(B) Windows 3.0 is not a version of Windows OS.

Incorrect Options:

(A) Windows 2.0 is the second version of Windows OS.

(C) Windows 1.0 is the oldest version of Windows OS.

(D) Windows 3.x is the third version of Windows OS.  

You need to login to perform this action.
You will be redirected in 3 sec spinner

Free
Videos