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    4.  Which of the following has a scroll wheel?

                                    (i)                                        (ii)

                                  (iii)                                       (iv)

                        5.  Choose the device that is used for typing letters and numbers.

                                    (i)                                        (ii)

                                  (iii)                                       (iv)

                     B.  Fill in the blanks using the given hints:

                        1.  CPU is the                   of a computer.
                                                                                                                Hints
                        2.                  is used to type letters, numbers and symbols.                      Mouse

                                                                                                              Keyboard
                        3.  A mouse has                     buttons.                                            Two

                        4.  Monitor                   everything you do on the computer.                      Displays
                                                                                                                Brain
                        5.                  is used to point and select items on the monitor

                            screen.

                                                                                          Building Blocks of a Computer  27

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