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चंदा मामा आ जाओ,

दूध बतासा खा जाओ|

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प्यारी चिड़िया आ जाओ,

दाल का दाना खा जाओ|

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Fast

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Charles Babbage

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Electronic

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Man-made

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Smart machine

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The three man-made machines are as follows:

1. Computer

2. Washing machine

3. Car

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CPU

CPU: CPU stands for Central Processing Unit. It is the brain of the computer.

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Advantages of machines are:

1. Machines make our work easy.

2. They help us to save time.

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1. Monitor: It is used to display images and text on the screen.

2. Keyboard: It is used for typing into a computer.

3. Mouse: It is used to give input to the computer.

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The features of computer are as follows:

1. A computer does not make mistakes.

2. A computer has large storage capacity.

3. A computer cannot think.

4. A computer does not have emotions and feelings.

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Teachers

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Sounds

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Mathematical calculations

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Paint

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Computer

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The games that we can play on computer are:

1. Cricket

2. Chess

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Computer helps us to send and receive messages to our friends and relatives quickly anywhere in the world.

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Computers are used in hospitals to keep patient records, make medical reports, monitor the condition of patients etc.

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1. Calculator – It is used to do calculations on computer.

2. MS Paint – It is used to draw and paint images on computer.

 3. Video Player – It is used to play movies and videos on computer.

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The three uses of computer at home are as follows:

1. Children can do their homework at home.

2. Children can play games on computer at home.

3. We can watch movies and videos on computer at home.

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A hard disk drive is a storage device. It is located inside the CPU box. It is used for storing data, instructions and information for future use.

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Central Processing Unit

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Monitor

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Keyboard

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MOUSE, PRINTER

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CPU is the brain of a computer. It stands for Central Processing Unit. It helps the computer to control all its others parts.

The CPU Box contains some components, like CD Drive, CPU, Hard disk drive, etc.

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The additional parts of a computer are:

Printer: Printer is used for printing pictures and text on paper.

Scanner: Scanner is used to scan the photographs and display them on the monitor.

Speaker: Speakers are used to listen to music and any other sound in a computer.

Microphone: Microphone is a device which is used to record sound in a computer.

UPS: UPS stands for Uninterrupted Power Supply. It keeps the computer on for some time even after the electricity goes off.

Modem: A modem is used to connect to the Internet.

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CPU stands for Central Processing Unit.
The main function of a CPU is to control the functions performed by the others parts of the computer. It is used to process instruction, perform calculations and manage most of the operations.

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Alphabet key

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CPU

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Space bar

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Alphabet key

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Typing

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Alphabet keys are used to type our name on a computer. We can type any letters of the alphabet by using the alphabet keys.

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There are 20 number keys on a keyboard. They are marked with numbers 0-9.

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Enter key is used to move to the next line. A keyboard has two enter keys. It is also called the return key.

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The two special keys are:

Space bar: It is used to give spaces between letters, words and numbers. It is the longest key on the keyboard.

Enter key: It is also known as the return key. It is used to move to the next line. A keyboard has two enter keys.

SOLUTION

A keyboard has different types of keys.

Alphabet keys:

• The alphabet keys are used to type alphabets.

Number keys:

• The number keys are used to type numbers.

Arrow keys:

• Arrow keys are used to move up and down, left and right on the screen.

Special keys:

• The special keys are used to perform special functions.

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Mousepad

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Single click

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Drag

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Scroll wheel

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CPU

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Pressing buttons on a mouse is called clicking. Clicking means to press and release the mouse button once.

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A mouse has three buttons i.e., left button, right button and a central scroll wheel.

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A mouse is used to point and open programs by pointing the pointer at them on the screen.

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Single click: Single click means to press and release the mouse button once. It is used to select an object on the screen.

Double click: Double click means to press and release the mouse button twice quickly. It is used to open a document.

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The steps to hold a mouse are as follows:

1. Position the mouse on the right side of the keyboard.
2. Put your index finger on the left mouse button.
3. Put your middle finger on the right mouse button.
4. Keep your palm on the backside of the mouse.

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राजस्थानी टोपी

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पंजाबी पगड़ी

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रामपुर में

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हिमाचली

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क़बाइली टोपी

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गाँधी