Quiz Scratch S1L4
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Questions and Answers

What is the primary function of a broadcast in Scratch?

  • To delete unused sprites from the project
  • To store variable values for different sprites
  • To send messages between sprites for script activation (correct)
  • To change the appearance of a sprite

How do broadcasts allow sprites to respond to events in Scratch?

  • By enabling sound effects to play based on events
  • By sending messages that activate scripts based on user interactions (correct)
  • By controlling the movement speed of sprites indiscriminately
  • By allowing them to change costumes dynamically

What is one way broadcasts can affect multiple sprites simultaneously?

  • By linking their costumes together
  • By allowing them to communicate with each other directly
  • By changing their size to a random amount
  • By sending a single message that triggers actions for all sprites at once (correct)

Which block is used to create clones of sprites in Scratch?

<p>The 'Create Clone' block (C)</p> Signup and view all the answers

What happens when a clone is created in Scratch?

<p>It inherits the costumes and scripts but operates independently (A)</p> Signup and view all the answers

Which of the following is NOT a typical use for broadcasting in Scratch?

<p>To make background images responsive to sprites (C)</p> Signup and view all the answers

When a broadcast message is received, what occurs in Scratch?

<p>All sprites waiting for that message will run their respective scripts (B)</p> Signup and view all the answers

What function does the 'delete clone' block serve in Scratch?

<p>To remove a specific clone and halt its scripts (A)</p> Signup and view all the answers

What is the purpose of the Time variable in the countdown script?

<p>To represent the starting value of the countdown (A)</p> Signup and view all the answers

Which tool would you use if you want to create a perfect circle in the costume design area?

<p>The circle tool (D)</p> Signup and view all the answers

How does the countdown loop function in the script?

<p>It repeats while Time is greater than or equal to 1 (D)</p> Signup and view all the answers

What is the function of the 'fill with color' tool in costume creation?

<p>To apply color to a designated area (B)</p> Signup and view all the answers

What action occurs after the script pauses for 1 second in the countdown?

<p>The Time variable is decreased by 1 (D)</p> Signup and view all the answers

What happens if you want to make a message appear, such as 'Game over'?

<p>You need to add a sprite and go to costumes (A)</p> Signup and view all the answers

In the context of the game, how long will the shark remain active?

<p>30 seconds (A)</p> Signup and view all the answers

Which tool would you use for creating straight edges when designing a costume?

<p>The line tool (C)</p> Signup and view all the answers

Flashcards

Scratch Broadcast

A message sent from one sprite to another in Scratch, triggering matching scripts.

Broadcast Use Cases

In Scratch, use broadcasts to have sprites talk to each other, respond to events (like key presses), make multiple sprites act simultaneously (like dancing), and announce game end conditions (like 'Game Over').

Scratch Clone

A feature to copy a sprite multiple times within a Scratch project; each clone has same appearance, actions, and data as original.

Clone Actions

Clones automatically start running code attached to the "When clone starts" block. Clones can be removed using "Delete this clone."

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Clones' Scripts

Each clone has the same scripts, costumes, sounds and variables as the original sprite

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Clone Creation

A block in Scratch creates an exact copy of your selected sprite every time you click.

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Deleting Clones

Use the "Delete this clone" block to remove a clone.

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Broadcast to many

Broadcasting can communicate a message to a multitude of sprites, resulting in simultaneous task execution.

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Timer in Scratch

A variable that counts down from a starting value, usually in seconds, used to track time in a project.

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Timer Loop

Repeats a block of code until the timer reaches a specific value, often used for countdown timers.

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Timer Decreasing

The timer value decreases by a set amount, usually 1, each time the loop runs, creating a countdown effect.

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Scratch Costumes

Different appearances for a sprite, allowing you to change its look and create animations.

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Brush Tool

Used to draw freehand shapes and lines in Scratch costumes.

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Line Tool

Creates straight lines in Scratch costumes, ideal for shapes with sharp edges.

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Rectangle Tool

Draws perfect rectangles or squares in Scratch costumes.

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Circle Tool

Creates perfect circles or ovals in Scratch costumes.

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Study Notes

Scratch Session 1: Broadcasts

  • Broadcasts are messages sent between sprites in Scratch.
  • Broadcasts activate scripts in the receiving sprite when matching hat blocks are present.
  • Broadcast blocks are found in the "Events" block category, which are yellow.
  • They are located on the left side of the Scratch console.

Using Broadcasts in Scratch

  • Broadcasts enable characters to communicate and react to events.
  • Characters can respond to questions and share information through broadcasts.
  • "When I receive..." blocks react to specific broadcast messages.
  • Sprites can react in response to actions like pressing an arrow key (using broadcasts).
  • Multiple sprites can respond to a broadcast simultaneously (useful for coordinated actions).
  • Broadcasts can announce game events like "game over" or "you win".

Scratch Blocks: Broadcasts

  • `"broadcast [message]" blocks send a broadcast message.
  • `"when I receive [message]" blocks react to a received message.
  • "broadcast [message] and wait" block sends a message and waits for all sprites to finish their scripts before continuing.

Scratch Cloning

  • Cloning creates multiple identical copies of a sprite.
  • These copies have the same costumes, scripts, sounds, and variables as the original sprite.
  • They function independently except for the shared attributes.
  • `"create clone of [sprite]" blocks create clones.
  • "when I start as a clone" block starts the clone's code.
  • "delete this clone" block removes clones.

Application/Example in a Scratch Defence Game

  • The game centers around protecting a central "Earth" sprite from "evil ladybugs".
  • Player controls a "ladybug fighter" using the mouse.
  • Space bar creates a new clone of the fighter; it moves to attack the ladybugs.
  • Ladybugs randomly move towards the Earth.
  • Each ladybug that touches the Earth reduces the player's life count.
  • Gameplay continues until all lives are lost.
  • The player starts with 10 lives.

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Related Documents

Scratch Programming Session 1 PDF
Scratch Session 2 PDF

Description

This quiz explores the concept of broadcasts in Scratch. Learn how sprites communicate and react through broadcast messages and the different blocks used for this purpose. Test your knowledge on using broadcasts effectively in your Scratch projects.

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