Multiple Choice Questions: Moving Sprites in Scratch

📚 Quick Study Guide

• 🧭 Coordinate System: Scratch uses an x-y coordinate system. X increases to the right, and Y increases upwards. The center of the stage is (0, 0).
• 🧱 Motion Blocks: Blocks like 'move ( ) steps', 'go to x: ( ) y: ( )', 'change x by ( )', and 'change y by ( )' control sprite movement.
• 🔄 Loops: 'forever' and 'repeat ( )' blocks are essential for continuous or repeated movements.
• ⏱️ Timing: The 'wait ( ) seconds' block introduces pauses in the sprite's movement.
• 🎭 Costumes: Sprites can have multiple costumes, and switching between them creates animation.
• 🖱️ Sensing: Use 'touching ( )' block to detect collisions between sprites or stage edges.
• 💡 Variables: Variables can store and change values (like speed or position) during the program's execution.

🧪 Practice Quiz

1. Which of the following blocks moves a sprite a specific number of steps in its current direction?
   1. A. `go to x: ( ) y: ( )`
   2. B. `move ( ) steps`
   3. C. `change x by ( )`
   4. D. `set x to ( )`
2. What coordinate values represent the exact center of the Scratch stage?
   1. A. (100, 100)
   2. B. (0, 0)
   3. C. (-100, -100)
   4. D. (480, 360)
3. Which block is used to make a sprite continuously move across the stage?
   1. A. `repeat ( )`
   2. B. `if ( ) then`
   3. C. `forever`
   4. D. `stop`
4. How can you make a sprite appear to walk by changing its appearance?
   1. A. Using the `change color effect` block
   2. B. Switching between different costumes
   3. C. Using the `say ( ) for ( ) seconds` block
   4. D. Using the `hide` and `show` blocks
5. Which block would you use to pause the script for a specified amount of time?
   1. A. `wait ( ) seconds`
   2. B. `move ( ) steps`
   3. C. `glide ( ) secs to x: ( ) y: ( )`
   4. D. `turn ( ) degrees`
6. What is the purpose of the 'change x by ( )' block?
   1. A. To set the sprite's x-coordinate to a specific value.
   2. B. To move the sprite up or down.
   3. C. To change the sprite's costume.
   4. D. To increase or decrease the sprite's x-coordinate relative to its current position.
7. How can you detect if a sprite is touching the edge of the stage?
   1. A. Using the `distance to [mouse-pointer]` block
   2. B. Using the `touching [edge]?` block
   3. C. Using the `timer` block
   4. D. Using the `loudness` block