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App Inventor Quiz - Key Concepts

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Questions and Answers

Which of the following is NOT a characteristic of the Notifier component's ShowMessageDialog?

The message automatically disappears after being displayed. (correct)

The message disappears only after the button in the dialog is pressed.

It allows setting the button text content.

It allows setting the title name.

Which commands can open another Screen? (Select all that apply)

Command from the Screen component for AboutScreen.

Command from the Control option to open another screen with start value. (correct)

Command from the Control option to open another screen. (correct)

Command from the Screen component for openScreenAnimation.

Where is the origin point (0,0) of the Canvas component located?

In the upper left corner of the Canvas component. (correct)

In the center of the Canvas component.

In the lower right corner of the Canvas component.

In the upper right corner of the Canvas component.

Which components require a network connection? (Select all that apply)

WebViewer component. Signup and view all the answers

Which event can automatically execute without user interaction?

Initialize event of the Screen component. Signup and view all the answers

Which component in App Inventor is considered a non-visual component?

Sound Signup and view all the answers

What setting maintains the Screen in a portrait orientation?

Portrait Signup and view all the answers

How many times will the Clock Timer event execute if the Timer Interval is set to 100 milliseconds?

10 Signup and view all the answers

Which arrangement component allows for horizontal alignment of elements?

HorizontalArrangement Signup and view all the answers

In App Inventor, what option allows a component to become invisible without deleting it?

Visible Signup and view all the answers

Which parameters allow the screen orientation to change with the device's holding position?

Unspecified Signup and view all the answers

What is the appropriate width setting for a component to fill its parent container?

Fill parent Signup and view all the answers

Which component requires the camera functionality of the device?

Camera Signup and view all the answers

What is the file format used for app projects in App Inventor?

.aia Signup and view all the answers

What data type is returned when a CheckBox is checked?

Logic Signup and view all the answers

Study Notes

App Inventor Quiz - Key Concepts

Invisible Components (Question 1): Sound is an invisible component in App Inventor.
Screen Orientation - Portrait (Question 2): Using Portrait will keep the screen in a vertical orientation.
Screen Orientation - Landscape (Question 3): Using Landscape keeps the screen horizontal.
Screen Orientation - Automatic (Questions 4): Unspecified and Sensor allow the screen to change orientation automatically based on device rotation.
Clock Component Timer Interval (Question 5): A Timer Interval of 100 results in the Clock Timer event executing 10 times per second.
Component Sizing - Fill Parent (Question 6): Setting width to Fill parent makes a component expand to fill its container.
Component Sizing - Automatic (Question 7): Setting width to Automatic allows a component to adjust its width based on its content.
Horizontal Arrangement (Question 8): HorizontalArrangement arranges components horizontally.
Component Visibility (Question 9): Using Visible property allows to control if a component is visible in the app or not.
Camera Components (Question 10): Camcorder and Camera components require access to the device's camera.
Components Not Allowed in Canvas (Question 11): Image, and Camera components can´t be placed within a Canvas component.
Initialize Event (Question 12): The Initialize event in the Screen component executes code when the app first loads.
Background Image Setting (Question 13): The Ball component does not have a Background Image property.
App Inventor File Format (Question 14): .aia is the App Inventor project file format.
Android Install File Format (Question 15): .apk is the Android installation file format.
Valid Project Name (Question 16): 21050101project and project2015 are not valid names.
CheckBox Data Type (Question 17): A CheckBox returns a Logic value (true/false) when checked.
Font Sizing (Question 18): FontSize property controls the font size of a component's text.
Notifier Component - ShowMessageDialog (Question 19): The ShowMessageDialog in the Notifier automatically disappears after a delay.
Opening Another Screen (Question 20): Use the Control options of open another screen commands and open another screen with start value commands to move to different screen.
Canvas Origin (Question 21): The origin (0, 0) of the Canvas component is at its top-left corner.
Network Components (Question 22): WebViewer and SpeechRecognizer components require internet connection.
Automatic Event Execution (Question 23): The Initialize event executes automatically when the app starts, without requiring user interaction.

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Description

Test your knowledge of key concepts in App Inventor with this quiz. From invisible components to screen orientations and timer intervals, assess your understanding of essential elements that power your app development. Perfect for beginners and those looking to refresh their skills!