Our food 

We all need food stay alive.food helps us grow.

It makes us health and strong.we get energy from food to work and play.

Sources of food 

We get most of our food from plants and animals.

Food from plants 

Most of our food comes from plants. We get vegetables, fruits, cereals, pulse, nuts, oils and spices from plants.

Food from animals 

Some of our food comes from animals. We get milk, eggs, meat fish, chicken and honey from animals. We can make many food items from milk like,curd, butter, cheese, icecream, paneer, ghee, etc.

Eggs ?.  Milk    ?. 

Food groups

We eat different types of food and each food item has different quality.

For example, the rice ? and chapattis are made from cereals which gives us a lot energy. On the other hand, dal, egg, milk and soyabean help us to grow.

The food we eat everyday is divided into three major groups . 

Number system 

When we type some letters ro words the computer translates them in number as completes can understand only number the information is expected in worlds a word is a group of bits the length of which varies from machine to machine the world may be as long as 64 bits or as shorts 8 bits. The fundamental grouping is called a byte rather than as word. A byte consists of eight bits. A byte can be used to represent.

1.    A complete can understand the positional number system where there are only a few symbols called digits and these symbols represent different values depending on the positional they occupy in the number.

The value of each digit in a number can be delivered using.

The digital:  the position of the digit in the number.

The base of the number system where the base is defined as the total number of digits available in the number system.

Some important number system are as follows: 

*.         Decimal number system 

*.         Binary number system 

*.          Octal number system

*.           Hexadecimal number system 

The decision number system is used in general. However the computer use binary number system. The octal and hexadecimal number system are used in the computer.

     Operating system

What is operating system 

An operating system is a program that acts as an interfaces between the software and the computer hardware. It is an interesting set of specialized programs used to manage over all resources an operations of the computer. For example the operating system recognized input from an input device such as the keyboard mouse, microphone or pc coordinates the display of output on the monitor instructs a printer how and when to print information and manages data and instructions in memory and information systems on disk. A complete needs an operating system to work and provide a graphical user interface for highel level functions.

Goal of an operating systems 

The fundamental goal of a completer system is to execute user programs and to make task easier. Various application programs along with hardware system are used to perform this work. Operating system is a software which manages and control the entire set of resources and effectively utilize every part of a completer.