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Let's REFRESH


                       A computer works in three steps: Input → Process → Output. This is also called
                      IPO cycle.

                       The devices that are used to enter data into the computer and give orders are called
                      input devices. Some input devices are keyboard and mouse.
                       The  device  that  works  on  the  input  is  called  processing  device.  CPU is  the  main

                      processing device.
                       The devices that are used to get the results are called output devices. Some of the
                      commonly used output devices are monitor, printer, headphones and speakers.





                                                       exercise





                 A.  Tick ( ) the correct option.

                    1.  Which of the following works like the brain of the computer?



                         (i)                                             (ii)





                       (iii)                                             (iv)


                    2.  Which of the following is not an output device?


                         (i)                                             (ii)





                       (iii)                                             (iv)



                    3.  Which of the following is an input device?



                         (i)                                             (ii)





                       (iii)                                             (iv)





                                                                                     Working of a Computer     11
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