17.12. Multiple Choice Questions

11-9-1: What order do these four statements need to appear in to not give any errors?

Statement 1 : alex = Turtle()
Statement 2 : from turtle import *
Statement 3 : space = Screen()
Statement 4 : alex.forward(50)

• 1234
• You must first import the turtle module.
• 2341
• You must create a turtle object before you ask it to do things using dot notation.
• 3142
• You must first import the turtle module.
• 2314
• Correct! The turtle module needs to be imported and then a screen needs to be created before creating a turtle object.

11-9-2: What letter will this code draw?

from turtle import *
space = Screen()
alex = Turtle()
alex.forward(100)
alex.left(180)
alex.forward(50)
alex.left(90)
alex.forward(150)

• L
• Incorrect! Follow every step and try to recreate the shape. Try again.
• A
• Incorrect! Follow every step and try to recreate the shape. Try again.
• T
• Correct! The code would create an T shape.
• H
• Incorrect! Follow every step and try to recreate the shape. Try again.

11-9-3: Which way does a turtle (object of the Turtle class) face after this code executes?

from turtle import *
space = Screen()
alex = Turtle()
alex.forward(150)
alex.left(180)
alex.forward(75)
alex.right(45)
alex.left(315)
alex.forward(50)

• East
• Incorrect! Remember where the turtle initially faces when it is created. Try again.
• South
• Incorrect! Remember where the turtle initially faces when it is created. Try again
• West
• Incorrect! Remember where the turtle initially faces when it is created. Try again.
• North
• Correct! The turtle always start from facing east by default.

11-9-4: How many errors are present in the following code?

from Turtle Import *
space = Screen
alex = turtle()
alexes.Forward('150')

• 4 errors
• Incorrect! Hint: Remember the correct syntax for creating turtles. Try again.
• 7 errors
• Correct! Every row in the code has atleast one problem.
• 6 errors
• Incorrect! Hint: Remember the correct syntax for creating turtles. Try again.
• 5 errors
• Incorrect! Hint: Remember the correct syntax for creating turtles. Try again.

11-9-5: Based on the given code, how many lines will be drawn on the screen?

from turtle import *
space = Screen()
alex = Turtle()
alex.forward(30)
alex.left(90)
alex.penup()
alex.forward(50)
alex.left(90)
alex.pendown()
alex.forward(20)
alex.right(90)
alex.penup()
alex.forward(50)
alex.left(180)
alex.forward(10)
alex.right(30)
alex.pendown()
alex.right(90)
alex.forward(30)

• 2 lines
• Incorrect! Hint: What do penup() and pendown() do? Try again.
• 3 lines
• Correct! Remember, that due to penup() some lines won't be printed.
• 4 lines
• Incorrect! Hint: What do penup() and pendown() do? Try again.
• 5 lines
• Incorrect! Hint: What do penup() and pendown() do? Try again.

11-9-6: What would be the final pensize and pencolor after this code executes for both the turtles?

from turtle import *
space = Screen()
alex = Turtle()
james = Turtle()
alex.forward(30)
alex.left(90)
alex.color("blue")
alex.pensize(10)
alex.forward(50)
alex.left(90)
alex.color("red")
alex.forward(20)
alex.right(90)
james.pensize(5)
james.forward(50)
james.left(180)
james.forward(10)
james.right(30)
james.pensize(2)
james.right(90)
james.color("green")
james.forward(50)

• alex : 5, "Red", james : 4, "Green"
• Incorrect! Follow every step and try to recreate the shape. Try again.
• alex : 10, "Blue", james : 10, "Red"
• Incorrect! Follow every step and try to recreate the shape. Try again.
• alex : 2, "Green", james : 10, "Blue"
• Incorrect! Follow every step and try to recreate the shape. Try again.
• alex : 10, "Red", james : 2, "Green"
• Correct! The given code would have the turtle with these values at the end of the code.

11-9-7: What are the final coordinates of the turtle at the end of this code?

from turtle import *
space = Screen()
alex = Turtle()
alex.forward(30)
alex.left(90)
alex.goto(120, 50)
alex.forward(50)
alex.left(90)
alex.goto(30, 30)
alex.forward(20)
alex.right(90)

• (30, 10)
• Incorrect! Follow every step and try to recreate the shape. Also see what goto() does. Try again.
• (10, 30)
• Correct! The turtle is facing west at (30,30) when it goes forward 20 which decreases x to 10.
• (30, 30)
• Incorrect! Follow every step and try to recreate the shape. Also see what goto() does. Try again.
• (50, 30)
• Incorrect! Follow every step and try to recreate the shape. Also see what goto() does. Try again.

11-9-8: What shape would the following code draw?

from turtle import *

def draw_shape(turtle, xpos, ypos, width, height, color, size):
    turtle.penup()
    turtle.goto(xpos, ypos)
    turtle.pendown()
    turtle.color(color)
    turtle.pensize(size)
    turtle.begin_fill()
    for x in range(2):
        turtle.forward(width)
        turtle.right(90)
        turtle.forward(height)
        turtle.right(90)
    turtle.end_fill()

space = Screen()
alex = Turtle()
draw_shape(alex, 10, 20, 50, 20, 'blue', 5)

• The outline of a square in blue
• Incorrect! Think what the .begin_fill() method does. Try again.
• The outline of a rectangle in blue
• Incorrect! Think what the .begin_fill() method does. Try again.
• A blue square
• Incorrect! Look at the height and width parameters of the function. Try again.
• A blue rectangle
• It will draw a filled blue rectangle.

11-9-9: Given the function below. What parameters would you use to create a green rectangle of pen size 7 with a width 80 and height 50 at location (-100, 80)?

from turtle import *

def draw_rectangle(turtle, xpos, ypos, width, height, color, size):
    turtle.penup()
    turtle.goto(xpos, ypos)
    turtle.pendown()
    turtle.color(color)
    turtle.pensize(size)
    turtle.begin_fill()
    for x in range(2):
        turtle.forward(width)
        turtle.right(90)
        turtle.forward(height)
        turtle.right(90)
    turtle.end_fill()

space = Screen()
alex = Turtle()

• draw_rectangle(alex, 80, 50, -100, 80, 'green', 7)
• Incorrect! The parameters are assigned in order. Try again.
• draw_rectangle(alex, -100, 80, 80, 50, 'green', 7)
• This assigns the parameters correctly.
• draw_rectangle(alex, -100, 80, 80, 50, green, 7)
• Incorrect! The color must be a string.
• draw_rectangle(alex, 80, 100, 80, 50, 'green', 7)
• Incorrect! The xpos is before the ypos.

11-9-10: What is drawn when the following code runs?

from turtle import *
def draw_triangle(turtle, xpos, ypos, width, color, heading):
    turtle.penup()
    turtle.goto(xpos, ypos)
    turtle.setheading(heading)
    turtle.pendown()
    turtle.color(color)
    turtle.begin_fill()
    for side in range(3):
        turtle.forward(width)
        turtle.left(120)
    turtle.end_fill()

space = Screen()
alex = Turtle()
draw_triangle(alex, -120, 30, 60, 'green', 60)
draw_triangle(alex, -120, 30, 60, 'green', 240)

• Tree
• Incorrect! Think of what the heading would be for each triangle. Try again.
• Hourglass
• Correct! This is the correct shape that will be printed from this code.
• Diamond
• Incorrect! Think of what the heading would be for each triangle. Try again.
• Rectangle
• Incorrect! Try to draw it yourself.

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