CSD Unit 3 - Games and Animation Assessment

You want to create a variable to store how loud the music is playing on your cell phone. Which of the following would be the best variable name?

• a

• volume

• loudest

• silent

Answer explanation

Content: Unit 3 Lesson 5

volume is the most meaningful name. loudest and silent are possible values for how loud the music is playing, but they are not good variable names.

The program below attempts to draw a crab with a blue background. What change needs to be made so that it works correctly?

• Move background("blue"); to the end of the program

• Move drawSprites(); to the end of the program

•   Rename the variable sprite to crab

• No change, the program already works

Answer explanation

Content: Unit 3 Lesson 7

drawSprites() should be called after all the sprites have been created.

The program below attempts to draw a blue rectangle but does not work as intended. What change needs to be made for the blue rectangle to be drawn?

• drawRect; should be at the end of the program

• fill("blue"); should be moved outside of the function and after drawRect;

• fill("blue"); should be moved outside of the function and before drawRect;

• drawRect; should be drawRect();

Answer explanation

Content: Unit 3 Lesson 24

Whenever you want to use a function you need to call it by its name. To do this you just write the name of the function followed by parentheses.

Given the functions below, write a program that will draw the scene on the right.

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Answer explanation

Content: Unit 3 Lesson 24

Since the background is yellow, drawBackground() must be called. Since the red rectangle is on top of the green ellipse, drawTwo() is called after drawOne().

The program below draws the scene on the right, but you want the rectangle to be further to the right. How can you change the code to achieve this?

• Call .moveRight()

• Add a line of code to change rect.x = 100;

• Update the first argument of rect() to 100

• D.   No change needed: the rectangle is animated to move right

Answer explanation

Content: Unit 3 Lesson 4

The first parameter of rect() is the x-location. By increasing the x-location to 100, the rectangle will be further right.

Describe what will happen in the following program.

• When the right mouse button is pressed, the sprite moves to the right. When the left arrow key is pressed, it rotates.

• When the left mouse button is pressed, the sprite rotates. When the right arrow key is pressed, it moves to the right.

• When both the left mouse button and right arrow key are pressed, the sprite rotates and moves to the right.

• When the left mouse button is pressed, the sprite rotates. When the right arrow key is pressed, it moves to the right. When the left arrow key is pressed, it moves to the left.

Answer explanation

Content: Unit 3 Lesson 15, 16

Which of the following programs correctly draws a rectangle at a random x position? (Select two)

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• 
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Answer explanation

Content: Unit 3 Lesson 6

Which program will draw the image below?

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Answer explanation

Content: Unit 3 Lesson 2

Since the green ellipse is on top of the red rectangle, the red rectangle should be drawn first, then the green ellipse.

You need to update the code below to animate the fish to move from the right side of the screen to the left side of the screen. In the draw loop, what line of code do you need to add before drawSprites()?

• orangeFish.moveLeft();

• orangeFish.move = "left";

• orangeFish.x = orangeFish.x - 2;

• orangeFish.x = orangeFish.x + 2;

Answer explanation

Content: Unit 3 Lesson 12

Your friend has added code to simulate gravity. Which new line of code are you most likely to see in their program?

• monkey.displace(rabbit);

• elephant.collide(hippo);

• giraffe.bounce(parrot);

• rock.velocityY = rock.velocityY + 0.2;

Answer explanation

Content: Unit 3 Lesson 22, 23