APCSP Unit 1

Which of the following is an important step to take before beginning to write the code for a program?

• Plan the logic and anticipated input/output of the code

• Randomly generate the variable names to be used in the program

• Plan an update and maintenance schedule for the program

• Write on paper or a whiteboard all the code you intend to type

Which of the following could be considered part of the beginning “state” of a Scratch program?

• Visibility of sprites

• The background image

• The value of a variable

• All of the above

As part of the lifecycle of a program, after a computer programmer writes the code, it is then compiled and usually used to create an executable file to be run on the CPU. The code that is run through the compiler is known as what?

• Machine Code

• Source Code

• Binary Code

• RAM

Subana is writing a program which will calculate the mean average of a set of numbers by adding the numbers and dividing the result by the amount of numbers. She will use a variable, avg, to store this average. Which variable type would be most suitable for avg?

• Floating point (float)

• Boolean

• Integer

• String

Tom created the following code segments in Scratch, which are intended to create a short piece of music between them.

When the green flag is clicked, each of the three scripts is intended to run in turn, however, due to a mistake in the code, this does not happen. Which of the following changes could Tom make to ensure that all three of the scripts run as intended?

• Delete the block

  "Set volume 100 %"

• Replace the block "broadcast sound3" with the block "broadcast sound2"

• Both of the above options

• None of the above options

Many tasks, large and small, can be solved by performing a specific set of actions and making a particular set of decisions in very precise ways. These sets of actions and decisions are known as what?

• Abstraction

• Algorithms

• Building Blocks

• Processes

Which of the following could be represented by a boolean variable?

• The direction a car proceeds in at a 4-way intersection

• The number of tech support requests made in a day

• Whether a guest at a wedding is allergic to peanuts

• The weight of a truck as recorded at a weigh-station

Peter wrote the following code in scratch to make a sprite perform a series of coordinated moves, forming a “dance routine.”

The code will be used for a competition, and Peter does not want to reveal the moves performed by the sprite in his program. Currently the path taken by the sprite is traced on the screen. Which of the following changes to the code will change this and allow Peter to keep the path taken by his sprite hidden?

• Removing the "pen down" block

• Removing the "set x to 0" block

• Removing the "thing O-la-la for 2 seconds" block

• Removing the "change color effect by 25" block

Which of the following types of languages is optimized for machine processing and may be written and expressed as a series of binary digits (e.g., ones and zeros), making it difficult for humans to read and write?

• Natural language

• Pseudocode

• High-level programming language

• Low-level programming language

Consider constructing an algorithm for a robot that can only perform the following three predefined operations.

Which of the following algorithms will successfully cause the robot to trace out a square-shaped path, with the robot ending up in its original position and facing in its original direction?

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