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    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.

                                                      TeCh Ready

                     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)

                                                                                         Working of a Computer     11

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