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    4.   Playing  games for  a  long  time on  the  computer

                                                          distracts us from doing our daily tasks.

                                                      5.   Sometimes  our computers may get infected by a
                                                          virus.  A computer  virus is a  harmful  program  that

                                                          doesn’t let a computer work correctly.

                             Restart

                            A computer is an electronic machine.

                            A computer works on the IPO (Input-Process-Output) cycle.

                            The data or instructions we give to the computer are called input.

                            The input devices are keyboard, mouse and scanner.
                             The ALU does arithmetic calculations like addition, subtraction, multiplication,

                            division.

                             The result which we get after processing the data and instructions is called
                            output.

                            The output devices are monitor, printer, speakers, etc.

                                                              Checkpoint

                      A.  Tick ( ) the correct option.

                          1.  Which of the following can do all arithmetic calculations?

                              a.  CU                                         b.  ALU

                              c.  MU                                         d.  CD

                          2.  Identify the device that is used to enter data into the computer.

                              a.  Printer                                    b.  Mouse

                              c.  Keyboard                                   d.  Monitor

                     12     Premium Edition-III

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