Unit 3 Post-Project Practice Test

Front

The program below attempts to draw a crab with a blue background. What change needs to be made so that it works correctly? Options: Move background("blue"); to the end of the program, Move drawSprites(); to the end of the program, Rename the variable sprite to crab, Remove the line of code background("blue");, No change, the program already works

Back

Move drawSprites(); to the end of the program

Answer explanation

You have to use the drawSprites command AFTER you create your sprite, because the computer reads the code in order.

Front

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

Back

Answer explanation

Remember. Order is important. Think of it like hanging things on a bulletin board. Whatever you code last, will show up on the top.

Front

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? Options: a, volume, loudest, 100, silent

Back

volume

Answer explanation

Make sure that your variable names are specific.

Front

The program on the left draws the scene, but you want the rectangle to be further to the right. How can you change the code to achieve this? Options: Call .moveRight(), Add a line of code to change rect.x = 100;, Update the first argument (parameter) of rect( ) to 100, No change needed: the rectangle is animated to move right

Back

Update the first argument (parameter) of rect( ) to 100

Answer explanation

The first arugument (parameter) in the rect code changes the x-position.

Front

Describe what will happen in the following program: When the left mouse button is pressed, the sprite rotates. When the right arrow key is pressed, it moves to the right.

Back

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

Answer explanation

Look for the answer that uses a left click for rotate and a right key press for moving to the right. There is not code that makes it move to the left. There is not code that makes it only rotate and move to the right when the left click AND right key press are done at the same time.

Front

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? Options: 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();, rect(0, 300, 200, 50); should be rect(0, 300);

Back

drawRect; should be drawRect();

Answer explanation

They attempted to call the function at the top of the program, but the gray block shows that it is just a comment. In order to make a function, it needs parentheses at the end of the function ( ).

Front

Which program will draw this image? Options: fill("red"); ellipse(100, 100, 50, 50); fill("green"); rect(100, 100, 50, 50);, fill("green"); ellipse(100, 100, 50, 50); fill("red"); rect(100, 100, 50, 50);, fill("red"); rect(100, 100, 50, 50); fill("green"); ellipse(100, 100, 50, 50);, fill("green"); rect(100, 100, 50, 50); fill("red"); ellipse(100, 100, 50, 50);

Back

Answer explanation

Look for the answer choice that draws a red square first, so it is behind the other shape, and then a green circle (ellipse), so it is on top.

Front

Your friend has added code to simulate gravity. Which new line of code are you most likely to see in their program? Options: monkey.displace(rabbit);, elephant.collide(hippo);, giraffe.bounce(parrot);, rock.velocityY = rock.velocityY + 0.2;, snake.bounceOff(pig);

Back

rock.velocityY = rock.velocityY + 0.2;

Answer explanation

We can simulate gravity by using a counter pattern with velocity.

Front

Consider the following program. What is the value of score at the end of this program? Options: 0, 1, 5, 6, 100

Back

6

Answer explanation

The score starts at 0. Then 1 point is added to the score. The if-statement is true (health > 90), so the score gets 5 more points, for a total of 6 points.

Front

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()?

Back

orangeFish.x = orangeFish.x - 2;

Answer explanation

You need a counter pattern to make the fish move to left. To make it go left, you will need to make it smaller by subtracting, because the left side is 0.