CBSE Class 3 Computer Science Computer Basics Notes

Alphabetical Keys:-A,B,C………………………………Z are alphabets keys. There are 26 alphabet keys on the keyboard. Whenever we press these keys associated alphabet in small case is written in the screen.

Numerical Keys:- 0,1,2,…………………………9 are numeric keys. There are 10 numeric keys on the keyboard.

Special Keys: There are various special keys

Caps Lock: – This key is used whenever we want to type the entire sentence, whole word and letter in a capitals. To use this key press it once and see the yellow light on the right corner of keyboard where the Caps Lock is written on a button. If the light is on it means the Caps Lock is active. If we want to write in small case then press this button again the Caps Lock is off now.

Enter Key:- This key is used to finish a line and move to a next new line on the page. Enter key is pressed after typing every command. There are two Enter key on the keyboard.

Shift Key:-Shift key is present on both sides of the keyboard. The Shift key is modifier key on a keyboard .The shift key is a modifier key on a keyboard, used to type capital letters and other alternate "upper" characters. There are typically two shift keys, on the left and right sides of the row below the home row.

Space Bar:-This key is used to insert the space between two word. It is the longest key on the keyboard.

Backspace:-is used to delete any character before the current position of the cursor.

Arrow Keys:-is used to move the cursor position in all directions (left, right, up and down) in the page.

Identify the buttons of Mouse- description of different buttons on the mouse.

1. Left mouse button is used to point to any menu, tool, icon and selection of text, face, surface and we can select multiple entities by this butto
2. Wheel is used to scroll the page up and down.
3. Right mouse button is used to invoke the shortcut menu.

Do’s and Don’ts of Computer Lab

1. Remove your shoes before entering in the computer Lab.
2. Wash and dry your hands before touching computer parts.
3. No Food and Drink is allowed in the Computer Lab.
4. Work Quietly in the Computer Lab.
5. Do not change any computer setting.
6. Do not install or download any software or modify or delete any system files on any lab computers.
7. Search through internet must remain for academic purposes. Only Visit the approved Websites through Internet.
8. Operate the computer equipment properly.

Strengths and LIMITATIONS of Computer

Strengths

1. Fast- Computers are much faster as compared to human bein
2. Accurate – Computer can perform all calculation accurately.
3. Store Large amount of data- We can store large amount of data in the computer.
4. Reliability- Computers are more reliable than human.
5. Versatile-Computer can perform variety of operations on the same data set.

Limitations

1. No IQ level
2. Works on electricity
3. 3. Cannot think by itself.
4. Unable to take decision.

Let us do practice now

TYPE-I (Short answers based questions)

TYPE-II (Fill in the blanks)

1. Computer has _______part
2. Monitor looks like a________.
3. The computer is an_________machine.
4. In schools, computer is used to teach________subjects.
5. Versatile means______.

Type-III(True or False)

1. Computer can solve only mathematical problem (True/False)
2. Mouse is used for clicking.(True/False)
3. Monitor is used for displaying output. (True/False)
4. The backspace key is used to insert characters. (True/False)
5. Computer is very slow machine. (True/False)

Lab Session

Type the following line

1. My name is ________.(your name)
2. I Live in________.(your address)
3. I like my school very much.

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