CMU Unit 1 Practice Test

Which shape is specified by the (x,y) coordinates of the center of the shape?

• Rect

• Circle

• Polygon

• Line

Answer explanation

A Rect has (x,y) coordinates of the top left corner, a Polygon is made up of many coordinates along the outside of the shape, and a Line is made up of the coordinates of its two endpoints.

Which of the following has a logical error? We are trying to draw a blue circle centered at (300, 350).

• Circle(300, 350, 40, fill='blue)

• Oval(300, 350, 40, 40, fill='blue)

• Oval(40, 40, 300, 350, fill='blue)

• Circle(300, 350, 80, fill='blue)

Answer explanation

Oval(40, 40, 300, 350, fill='blue) draws an oval centered at (40, 40) with a width and height of 300 and 350 respectively. The code runs, but it doesn't do what we want - a logical error!

All of the following are properties of labels EXCEPT:

• border

• All are valid properties

• italic

• size

Answer explanation

Labels cannot have borders, as they are just text. Only shapes can have borders.

Which code draws this picture?

• RegularPolygon(100, 100, 130, 4, fill='blue')

• Polygon(150,250,200,200,250,250, fill=None, border='blue')

• Polygon(200,200,250,250,150,250, fill='blue')

• Circle(100, 200, 30, fill='blue')

Syntax Error

• Code follows the rules of Python and runs, but crashes after it starts.

• Code doesn't run because program doesn't follow the rules of Python.

• Code runs, but doesn't do what we want it to do.

• Code runs and works perfectly.

Runtime Error

• Code follows the rules of Python and runs, but crashes after it starts.

• Code doesn't run because program doesn't follow the rules of Python.

• Code runs, but doesn't do what we want it to do.

• Code runs and works perfectly.

All of the following are types of errors EXCEPT:

• Syntax Error

• Logical Error

• Cascade Error

• Runtime Error

All of the following are properties for rectangles EXCEPT:

• font

• border

• borderWidth

• fill

Answer explanation

Font is only a property of labels.

What's the name of the place where we write all of our code.

• IDE (Integrated Development Environment)

• Google Docs

• CCW (Cloud-based Coding Window)

• AFE (Agile Framework Executable)

Which shape is not yellow at the bottom?

• Rect(50, 50, 100, 100, fill='yellow')

• Rect(50, 50, 100, 100, fill=gradient('yellow', 'black', start='bottom'))

• Rect(50, 50, 100, 100, fill=gradient('black', 'yellow'))

• Rect(50, 50, 100, 100, fill=gradient('yellow', 'black'))

Answer explanation

Gradient start is set to 'center' by default. That means that Rect(50, 50, 100, 100, fill=gradient('yellow', 'black')) will produce a rectangle that is yellow in the middle and black along the outsides - so will be black on the bottom.