1. What is an input device? The input device is used to enter data and give instruction to the computer. e.g Keyboard, Mouse, Scanner, Joystick, Web camera, Microphone, Barcode Reader.

2. What is an output device? A device that allows the user to see the information generated by computer is called an Output device. e.g monitor, printer, speaker.

3. Name the different parts of CPU. The different parts of CPU are (1) ALU (Arithmetic and logic unit) (2) CU (Control unit) (3) Memory unit

4. What is the use of a scanner? A scanner allows you to capture documents that are printed on paper and turn into digital format to be viewed on a computer.

5. What is barcode reader? The black and white parallel lines on a product contains coded information about the product and its price. This is read by a barcode reader.

6. What is the use of speakers in a computer system? The recorded sound in the computer can be played back through the speakers.

7. Name the following: 1) A person who uses a computer. Ans: User (2) A unit of CPU where arithmetic and logical operations are done. Ans: ALU (Arithmetic and logic unit) (3) An exclusive set of keys for numbers and arithmetic operations Ans: Numeric key pad. (4) The output device that look like a TV screen. Ans: Monitor

8. Name the following: (1) Storage devices. Ans: Hard disk, Pen drive, Floppy disk, compact disk (CD) (2)Input devices Ans: Keyboard, Mouse, Scanner, Joystick, Web camera, Microphone, Barcode Reader. (3) Output devices. Ans: Speakers, monitor, printer (4) Types of computer. Ans: Super computer, Mainframe computer, Mini computer, Personal computer, Laptop computer, Palmtop computer, Tablet computer.

9. What use the function of the following keys: (1) Spacebar Ans: It is used to insert blank space between any two characters or words. (2) Enter Key Ans: The enter key is used to move the cursor to the next line. It is also used to tell the computer to carry out the typed instruction. (3) Arrow keys Ans: The four arrow or cursor keys can be pressed to move the cursor in looking their directions. (4) Escape key Ans: It is used to tell the computer to abort or stop processing an instruction.

10. Fill in the blanks: (1)Scanner is an _______ device. (2) The ______ unit regulates and manages the whole computer system. (3) The coded black and white parallel lines on a product label is read by ______ reader and sent to the computer. (4) Hard disk is a ________ memory. (5) To rapidly click the left mouse button twice is called ________.

11. Fill in the blanks: Scanner is an input device. (2) The control unit regulates and manages the whole computer system. (3) The coded black and white parallel lines on a product label is read by barcode reader and sent to the computer. (4) Hard disk is a secondary memory. (5) To rapidly click the left mouse button twice is called double click.

12. Arrange the following device as input or output: (a) mouse (b)monitor (c)printer (d)keyboard (e)speaker (f)scanner (g)microphone Input devicesOutput devices MouseSpeaker Keyboardmonitor Scannerprinter Microphone

13. Distinguish between: Primary memory and secondary memory Primary memorysecondary memory 1) This is temporary memory.1) This is permanent memory. 2) Under primary memory have two types : RAM and ROM 2) Under secondary memory have hard disk, compact disk (CD), floppy disk. 3) It is also called main memory. 3) It is also called storage memory.

14. Answer in briefly: (1) What is a computer? Ans: computer is an electronic machine. It can store a large amount of data in its memory. It can process the same data to give a desired output according to the instruction we give. Computer increases the efficiency and productivity of any organization.

15. Answer in briefly: Write the limitation s of a computer. Ans: Limitation of a computer: (1) A computer lacks intelligence and works only on instructions. (2) A computer has no feeling or emotion and hence cannot be creative like human.