WorksheetsMoving Spots Illusion – Multiple Choice Test
Total questions: 25
Worksheet time: 15mins
What is the name of the Scratch project used in this lesson?
Spinning Circles
Moving Spots V1
Color Illusion
Rotating Shapes
What is the purpose of this illusion?
A) To create an animated bouncing effect
B) To create the illusion of moving spots without actual movement
C) To make the spots change color randomly
D) To make the spots disappear
What key is pressed to begin the game?
A) A
B) S
C) B
D) G
What key is pressed to stop the game?
A) Q
B) X
C) E
D) M
How many rows of spots are created in this project?
A) 10
B) 15
C) 20
D) 25
How many clones are created per row?
A) 10
B) 15
C) 21
D) 30
What background color is used for the stage?
A. Red
B. Blue
C. Green
D. Yellow
What is the primary function of the "When Green Flag Clicked" block?
To end the game
To stop all scripts
To initialize the game and start cloning
To change the color of the spots
What is the purpose of the "Broadcast Begin Game" block?
To create clones of the sprite
To change the speed of animation
To signal that the game has started
To delete all sprites
What property is set for the spot sprite before cloning begins?
Size at 25%
Size at 50%
Size at 75%
Size at 100%
Where is the first spot positioned on the stage?
Center of the screen
Bottom right corner
Top left corner
Random positions
Why is the original sprite hidden before cloning begins?
To prevent errors in the script
To allow only clones to be displayed
To save memory in Scratch
To increase animation speed
What happens when a new clone is created?
The clone moves to a new position and rotates slightly
The clone disappears immediately
The clone changes color randomly
The clone follows the mouse cursor
How much does each cloned sprite move to the right?
10 steps
15 steps
How much does each clone rotate?
1 degree
2 degrees
5 degrees
10 degrees
What happens if the cloning loop is not limited to 15 rows?
The game will not run properly
The game will continue cloning indefinitely
The game will crash
The spots will disappear
What Scratch block is used to create clones?
Create a clone of myself
Duplicate sprite
Make a copy block
Generate new sprite
What must happen after creating 21 clones in a row?
The Y position must decrease to start a new row
The X position must reset to zero
The background color must change
The clones must disappear
Why does the illusion work even though the spots do not move?
The varying rotations of each clone trick the eye
The background color shifts constantly
The spots are actually moving but very slowly
The colors change dynamically
What Scratch block is used to move the clones down a row?
Change Y by -20
Set Y to 0
Change X by 20
Move 10 steps
What is the final effect of the illusion?
What should you do after finishing your project?
Save over the original template
Save a new version of your project
Delete the project if it doesn’t work
Close Scratch without saving
How can students experiment with the illusion?
By changing the rotation angles and colors
By increasing the number of clones to 50
By setting the background to black
By deleting the sprite and restarting
What can be adjusted to make the illusion look different?
The size of the sprite and rotation angle
The position of the green flag block
The number of broadcasts in the code
The number of clones per row
What is the key learning takeaway from this lesson?
Small adjustments in rotation create a moving illusion
The only way to animate in Scratch is using motion blocks
Cloning in Scratch is only useful for duplicating objects
Optical illusions in Scratch require complicated programming
