AP Computer Science Principles AP MC Practice Questions

Front

A program that Thomas has written is complete. It has been tested thoroughly, and some outputs were not as expected. Thomas is now going through the code carefully attempting to establish the cause of these errors and change the code to remove them. What is this procedure called?

Back

Debugging

Front

Jeremiah is part of a group planning a summer fair at which local businesses can run stalls and events. He wants to use his programming skills to develop an app for the fair which businesses will be able to use to communicate information about their activities at the fair with visitors. What would be the best first step for Jeremiah to take? Options: Develop all of the major algorithms which will be required for the app by drawing flowchart representations, Write thorough documentation explaining how the code for the app works, Write some sample code to understand how the app might work, Find out from the businesses and potential visitors what information and format they think should be used for the app.

Back

Find out from the businesses and potential visitors what information and format they think should be used for the app.

Front

Which of the following is the MOST important reason computers use artificial languages over natural language? The meaning of different characters and words in an artificial languages is explicit and unambiguous, The syntax of natural languages is easy to translate by computers, The syntax of artificial languages is explicit and unambiguous , The meaning of different characters and words in an artificial languages is too complicated

Back

The syntax of artificial languages is explicit and unambiguous

Front

Which of the following best describes high-level computing languages? They are not very ambiguous, They are extremely difficult for humans to read and understand, They evolve naturally over time, They are very easy for machines to understand and parse

Back

They are not very ambiguous

Front

A statistics teacher wishes to create a program on her calculator that generates a random even integer. The command built in the calculator to generate a random positive integer is RANDOM(a,b). This command generates a random integer between integers a and b (and including a and b). Which line of code will ensure that the random integer generated will be even? Options: RANDOM(a,b) + 1, RANDOM(a,b) + 2, RANDOM(a,b) * 2, RANDOM(a,b) - 2

Back

RANDOM(a,b) * 2

Front

Which of the following best describes “compilation” in reference to computer science? Options: Memory is set aside to store variables and instructions so that a program can be executed. Code in a high-level language is converted to low-level instructions which can be interpreted and run by the CPU. Instructions are repeated a set number of times, or until some specified objective is completed. Algorithms which have been planned, for example using flow-charts, are written in code.

Back

Code in a high-level language is converted to low-level instructions which can be interpreted and run by the CPU.

Front

Which of the following is a reason for the importance of variables in programming? Variables assist in making code more readable. Variables allow you to change a value used in multiple places in a program easily. Variables allow you to store values calculated by the program and access them at a later point in the program.

Back

All of these

Front

Which of the following statements best describes the predictability of the results when this algorithm is run on a computer?

1. Double the value of n
2. Add 34 to the answer
3. Round the answer to the nearest ten
4. Sum the digits of the answer
5. Display the final answer

Options: It is impossible to predict the value of the answer displayed, even if the value of n is known., The answer displayed by the algorithm can be predicted for some values of n, but not for others., The algorithm always displays the same answer, regardless of the value of n., The answer displayed by the algorithm for any known value of n can always be predicted.

Back

The answer displayed by the algorithm for any known value of n can always be predicted.

Front

Which of the following is a valid reason for giving variables meaningful names in a program? A programmer will find it easier to read and understand the code since they will know what the variables represent.

Back

A programmer will find it easier to read and understand the code since they will know what the variables represent.

Front

Using the flowchart above, what value when entered for Y will generate a mathematical error and prevent our flowchart from being completely executed?

Back

None of these values will produce a mathematical error.