1. Define Memory unit :
       

In computer data can be stored in devices called storage devices

Storage devices are mainly three types,Primary data storage,Secondary storage device and tertiary storage device.These storage devices are also called Memory unit.

2. Explain the types of computer memory unit:

The Memory unit are mainly classified into two,Random Access memory (RAM) which is temporary storage and Readonly memory (ROM) which is permanent storage .
                

3.Explain the secondary memory :

The secondary storage devices are used to store data permanently.This is also known as External memory or Auxiliary memory.

Eg :- Floppy disc , CD , DVD etc

4. Explain Floppy disk :

 

A Floppy disc is a disk storage medium composed of a disc of flexible and thin magnetic storage medium sealed in a rectangle plastic carrier lined with fabric removes dust particles .

5. Explain Hard disk :

 
Hard disk is a device for storing and retrieving digital informations.A hard disk can store 10 to more than 100 gigabytes of data.

6. Explain 'CD / Compact disk' :

CD is a read only device and are the preffered storage media for one time backup of information.A standard CDs have a diameter of 120 millimeters (4.7 inches)and can hold up to 80 minutes of uncompressed audio or 700 MB of data .

7. Explain 'DVD' :

DVD is an optical disk storage format,offer higher capacity than CD.DVD can hold up to 700 MB of information

8. Explain 'Pendrive' :

Pendrive is a data storage device that includes flash memory with an integrated Universal Serial Bus (USB)interface.USB flash drives are typically removable and rewritable ,and physically much smaller than a floppy disk .

9. What are the type of Software ?

The software are mainly classified into two types-they are     

      • Application software
      • System software

10. Explain Application Software :

Application Software designed to help the user to perform specific tasks .                           

Eg :- Enterprise Software , Accounting Software , Graphic Software.

11. Explain System software :

System software refers to the files and programs that make up of computer operating system is necessary for the smooth functioning of the computer .

12. Define Operating system :

An Operating system is a set of softwares manages computer hardwares resources provide common services for computer programs .without a computer operating system a computer would be useless .

Eg :- MS-DOS , Windows , Linux

13. Explain Language processor :

Language processor is an artificial language system to understand the instruction given by the user ,

14. What are the types of Operating system ?

Operating system are mainly classified into two:          

              •  Single user Operating System

              •  Multi user Operating System.

15. Explain Single user Operating system :
        
In a Single user operating system one user can effectively do one thing at a time.The palm operating system for palm hand held computers is a good example of a modern single user operating system .

16. Explain Multi user Operating system :

A multiuser operating system allows multiple users on different computers or terminals to access a single system with one operating system on it .This OS systems allows the user to work in a network of computer
Eg :- Windows ,Linux .

17.What the differences between Dos and Windows ?
 

18. Explain terms used while working with windows operating system :
   
File :-  File system is a mass of computer used on data storage such as hard disk,floppy disk optical disk etc
Directory : Directory is a collection of related files
Drive :- Drive is the first level directory

19. What are the classification of computers  ?

Computer mainly classified into four.They are Micro computer,Mini computer,Main computer and Super computer

20. Explain notepad :

Notepad is a generic text editor included with microsoft windows that enables one to open and read plain text files .It help to edit ,undo,cut,copy paste find and replace text.Format menu helps you to apply word wrap and different form types .View menu allows you to show and hide a few menus .

21. Explain computer Virus and Antivirus :

Computer virus are small software programs that are designed to spread from one computer to another and to interfex with computer operation .