Unit 3: Interactive Animations and Games - Lessons 3-6

What does the `rect` block do in Game Lab?

• Plots a circle at given coordinates

• Changes the color of shapes

• Plots a square at given coordinates

• Plots a triangle at given coordinates

Answer explanation

The `rect` block in Game Lab is used to plot a square at specified coordinates. It creates a rectangle with equal width and height, making it a square, unlike the other options which refer to different shapes.

What is the purpose of the `ellipse` block in Game Lab?

• Plots a square at given coordinates

• Plots a circle at given coordinates

• Changes the color of shapes

• Plots a rectangle at given coordinates

Answer explanation

The `ellipse` block in Game Lab is specifically designed to plot a circle at given coordinates. It allows you to create circular shapes, unlike the other options which refer to different shapes or functionalities.

What do the x and y coordinates determine in Game Lab?

• The color of the shape

• The size of the shape

• The position of the shape on the display area

• The type of shape to draw

Answer explanation

In Game Lab, the x and y coordinates specify where a shape is located on the display area. They determine the position of the shape, while other factors like color and size are controlled by different parameters.

What does the `fill` block do in Game Lab?

• Changes the size of shapes

• Changes the color of shapes

• Plots a square at given coordinates

• Plots a circle at given coordinates

Answer explanation

The `fill` block in Game Lab is used to change the color of shapes before they are drawn. It sets the color that will be used for the interior of shapes like rectangles and circles.

What shape does the rect block create by default in Game Lab?

• Circle with radius 50

• Square with sides of length 50

• Rectangle with width 50 and height 100

• Triangle with sides of length 50

Answer explanation

In Game Lab, the rect block creates a square by default, specifically a square with sides of length 50. This is why the correct answer is 'Square with sides of length 50'.

What are the optional parameters for the rect block used for?

• To specify color and border

• To specify width and height

• To specify rotation and scale

• To specify texture and pattern

Answer explanation

The optional parameters for the rect block primarily define its dimensions, specifically width and height, which are essential for determining the size of the rectangle. Other options do not pertain to these dimensions.

What additional parameters does the ellipse block have?

• Color and border

• Width and height

• Rotation and scale

• Texture and pattern

Answer explanation

The ellipse block primarily requires width and height to define its dimensions. While other parameters like color and texture may be relevant, they do not specifically pertain to the fundamental shape of the ellipse.

Which of the following is NOT allowed in variable labels?

• Spaces

• Numbers at the beginning

• Underscores

• CamelCase

Answer explanation

Variable labels cannot contain spaces, as they are not valid characters. However, they can include numbers (not at the beginning), underscores, and CamelCase formatting.

Why is it important to use meaningful labels for variables?

• To make the program run faster

• To avoid syntax errors

• To know exactly what the variable is used for

• To reduce memory usage

Answer explanation

Using meaningful labels for variables is crucial as it helps you know exactly what the variable is used for. This clarity improves code readability and maintainability, making it easier to understand and work with the code in the future.

Which of the following is an example of using underscores in variable labels?

• myVariableName

• my-variable-name

• my_variable_name

• MyVariableName

Answer explanation

The correct choice is 'my_variable_name' because it uses underscores to separate words, which is a common convention in variable naming. The other options use hyphens or camel case, which do not involve underscores.