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WorksheetsWhirl Optical Illusion – Timestamped Multiple-Choice Test
Total questions: 20
Worksheet time: 10mins
What is the first action AI instructs the viewer to do?
Create a new sprite from scratch
Load a project file from your computer
Draw an optical illusion from scratch
Open the Scratch editor without a project
Which project file does AI load at the beginning?
World Spiral V2
03 World Spiral V1
Optical Illusion 101
Ghostbusters Game
What is the appearance of the stage backdrop in the project?
A gradient background with multiple colors
A white background with a grid
A black vector shape covering the stage
A photographic image of space
What is the purpose of the “frame” sprite?
It creates a colorful border around the stage
It serves as a hidden hitbox for collisions
It is a simple black frame that surrounds the other sprite
It displays score information
What does the “sides” sprite consist of?
A single complex shape
Two simple vector rectangles
Multiple animated characters
A moving background image
Why does the frame sprite help the illusion look smooth?
It adds a blur effect to the sides
It hides the jagged edges of the rotating sides
It rotates at the same speed as the sides
It changes colors to match the illusion
Before adding the animation, what does Al instruct to do with the stage?
Change the stage backdrop to a photograph
Add the “begin game” code using the usual key shortcuts
Delete all existing sprites
Create new variables for the animation
Which two keys does Al mention as shortcuts for beginning and ending the game?
B for Begin and E for End
S for Start and X for Exit
G for Go and H for Halt
L for Launch and P for Pause
After pressing the green flag, what event does the stage script broadcast?
Game Over
Begin Game
Stop Animation
Reset Stage
For the “frame” sprite, which property is set immediately after receiving the begin game message?
It is hidden
It is moved to the center of the stage and pointed to the right
It starts rotating immediately
It changes its color to white
What does AI instruct for the frame’s appearance?
Change the frame’s size to 50%
Bring the frame to the front layer
Duplicate the frame sprite
Hide the frame until the illusion starts
What size does AI set for the frame sprite?
50%
100%
140%
200%
When duplicating code from the frame sprite to the sides sprite, what two changes does AI make?
The size is changed to 140 and the sprite is sent to the back layer
The size is reduced to 80 and the sprite is hidden
The sprite’s rotation is adjusted and its color is changed
The sprite is duplicated twice and merged into one
What does AI say about the animation AI is about to create?
He explains every detail of the animation
He challenges the viewer to figure out the animation on their own
He demonstrates a pre-made animation
He skips the animation section entirely
How long is the short wait AI inserts before starting the repeat loop for the animation?
1 second
0.5 seconds
A tenth of a second
2 seconds
Which two variables does AI create to control the animation?
Spin and Zoom
Turn rate and Whirl rate
Speed and Acceleration
Frame count and Timer
At the beginning of the animation, what are the initial values of the turn rate and whirl rate variables?
Both set to 1
Turn rate is 0 and whirl rate is 1
Both set to 0
Turn rate is 1 and whirl rate is 0
How does the turn rate change during the repeat loop?
It stays constant throughout
It decreases by 0.2 degrees each time
It increases by 0.2 degrees with each iteration
It randomly changes each time
What effect does AI add after adjusting the turn rate?
He changes the sprite’s color
He increases the whirl rate by 1 to create a visual whirl effect
He stops the animation
He resets the turn rate to zero
What is the purpose of duplicating the code and then reversing the turn rate later in the animation?
To speed up the animation
To reset the illusion to its original starting point
To change the background color
To add a blinking effect to the sprites
