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4. Explain the different parts of the CPU.
Ans. CPU is basically divided into three parts:
• ALU stands for Arithmetic Logic Unit. It is responsible for all mathematical and logical calculations.
• CU stands for Control Unit. It controls the flow of information in the system. The control unit is responsible for the flow of
data from input devices to the process unit and then to the output devices. It works like a traffic policeman who controls
the traffic on the road.
• MU stands for Memory Unit. It is a storage unit that holds the processed or unprocessed data.
5. Define OS. Give examples of operating systems.
Ans. An operating system is system software which acts as an interface between the user and the computer. It is an important
component of a computer system which controls all other components of the computer system. It helps us to communicate
with the computer without knowing its language. Without an Operating System the computer is of no use. Some of the
commonly used Operating systems are Windows, DOS, UNIX, etc.
6. Differentiate between UNIX and DOS.
Ans.
UNIX DOS
It is one of the oldest, reliable and powerful Operating systems After Unix, DOS is one of the most commonly used operating
developed at AT&T's Bell Laboratories in the early 1970's. System written originally by Tim Patterson.
It supports multiuser and multitasking. It is a single-user operating system.
7. What is a Taskbar? What does it contain?
Ans. It is the thin strip present at the bottom of the screen. By default it is always visible at the bottom but we can choose the
auto hide option in the taskbar settings which will disappear the task bar. But it will reappear only when the mouse cursor
moves down to that area. It contains the following important components: Start Menu, Quick Launch Program icons,
Notifications Area, System Clock, Show desktop button.
8. Mention features of Mobile Operating system.
Ans. Some of the important features are:
• It has a Graphical user interface with menus and buttons supporting different types of apps.
• It has a strong multitasking feature.
• It allows a device to easily interact in short distance or long distance communication.
• Some of the commonly used mobile OS are Android, iPhone OS, Symbian OS, Windows OS, etc.
9. Mention advantages of using email.
Ans. The following are the advantages of using email:
• Sending and receiving emails is a fast way of communicating as compared to the traditional mails.
• Emails can be sent anytime. That means it's not restricted to only working days or working hours.
• Emails can be sent to one or multiple recipients without much effort and at no cost.
• It is an inexpensive way of mailing as it only requires an Internet connection.
10. Mention main objectives of digital India.
Ans. The main objectives of this initiative are:
• To provide a high speed network in the rural area.
• To provide governance and services on demand.
• Digital empowerment of every citizen of India.
• Restructuring many existing schemes under Digital India Programme so that they can be implemented in a synchronised
manner.
C. Give one word for each of the following statements:
1. Printed copy of a document.
2. Software that is designed for the users and are made to do a specific kind of work.
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