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                        There are many open source app development softwares available.
                       Design View contains all the components required to design an application.

                       Block Editor View is the place where  we do programming and add commands  by
                       joining blocks to execute an application.
                       Components pane  shows  a  list of  all the  components  added  to  the  screen  in  a
                       hierarchical view.

                       Backpack stores the copy of all the blocks even when we exit App Inventor.






                                                          Checkpoint




                 A.  Tick ( ) the correct option.
                    1.   Which of the following panes shows a list of all the components added to the screen in a hierarchical
                       view?
                       a. Palette Pane                                  b. View Pane

                       c. Components Pane                               d. Properties Pane
                    2.  Which of the following views contains all the components required to design an application?

                       a. Design View                                   b. Block Editor View
                       c. Both a and b                                  d. None of these

                    3.   Which of the following is the place where we code the components added in the Designer Window?

                       a. Block Editor                                  b. Viewer Pane
                       c. Component Pane                                d. All of these

                 B.  Write ‘T’ for true and ‘F’ for false.
                    1. Properties of the components can be changed from the Viewer pane.                   .....................

                    2. Trash is used for deleting blocks that are not required.                            .....................
                    3. MIT App Inventor is a free app development tool.                                    .....................

                 C.  Short answer type questions.

                    1.  Name the components of the Block Editor window.
                       .....................................................................................................................................................................................................

                    2.  What is the final step after creating an app?
                       .....................................................................................................................................................................................................






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