App Creators Lesson 1

In App Inventor, events are programmed using event handlers. What are event handlers?

• The period when a program is running.

• The layer of an app that contains the program that tells the app how to behave.

• In a program, an event that is triggered by user interaction with the user interface.

• A block of code that is triggered when a certain event happens.

What is the file extension for the programs in App Creators?

• .aia

• .com

• .hex

• .html

Which of the following event handlers will play an audio file when a check box is clicked in App Inventor? (Read carefully)

• 
• 
• 
• 

Which is true about the given flowchart?

• If A is true, then C will be performed.

• If A is true, then B will be performed.

• If A is false, then B will be performed.

• B or C will never be performed in this flowchart.

Which of the following are non-visible components? Select all that apply.

• Sound

• Clock

• Button

• TextBox

What does this block do?

• sets a variable name to 'global score' which can then be used in the entire program

• sets the initial score to zero

• sets a variable name to 'score' which can only be used once in the program

• sets a variable name to 'score' which can then be used in the entire program

This event handler will execute all, BUT:

• Play a Sound.

• Add 1 to the Score.

• Move the Mole.

• Set the Score to 0.

In your GermFighter app, how was the WhiteBloodCellSprite, programmed to only move left and right?

• The y-value did not change.

• The y-value changed to its opposite.

• The x-value did not change.

• The x-value changed to its opposite.

What is the sound file extension (other than .mp3), that was used in the GermFighter app?

• .aia

• .wav

• .png

• .com

Which menu option allows you to test your app?

• Project

• Connect

• Build

• Help