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CS Olympiad Booleans and Decisions — practice questions

Explore 30 free Booleans and Decisions questions in CS Olympiad Computer Science. Open each question or exercise to read its content, reference answers and available explanation.

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Booleans and Decisions questions and exercises with answers

Showing questions 1–30 of 30.

A quiz app stores whether a player passed. The data type it should use is:Read the answer and worked solution →A login screen checks whether user equals admin. The comparison returns:Read the answer and worked solution →A coder writes is_zero = num = 0 and every value gets wiped. His mistake was using:Read the answer and worked solution →A program must test, not change, a variable. The correct operator is:Read the answer and worked solution →A game checks if a score is even. A number is even when it divides exactly by:Read the answer and worked solution →An expression that evaluates to either true or false is called a:Read the answer and worked solution →In a Python if statement, the body runs only when the condition is:Read the answer and worked solution →A learner writes an if statement with nothing in its body. Python will produce:Read the answer and worked solution →PEP 8 recommends indenting each level of a Python body by how many spaces?Read the answer and worked solution →Instead of writing if is_raining == True, a tidy programmer writes:Read the answer and worked solution →When an if else statement runs, the number of branches actually taken is:Read the answer and worked solution →In Python the else keyword must sit at the same indentation level as the:Read the answer and worked solution →Python provides how many logical operators?Read the answer and worked solution →A club entry rule needs both age and ticket to be valid. The operator to use is:Read the answer and worked solution →A concert lets in anyone in band or choir. The operator to use is:Read the answer and worked solution →A program should act when a computer is switched off. The operator to use is:Read the answer and worked solution →In Python the expression 1 + 2 * 3 evaluates to:Read the answer and worked solution →In Python the expression (1 + 2) * 3 evaluates to:Read the answer and worked solution →The rule deciding order when two operators share a precedence level is:Read the answer and worked solution →Most Python operators are evaluated in which direction?Read the answer and worked solution →A curve program uses two separate if statements and both run by mistake. The fix is to use:Read the answer and worked solution →An elif statement is only legal when it directly follows an if or another:Read the answer and worked solution →Catch the true testsRead the answer and worked solution →Pop the logical operatorsRead the answer and worked solution →Run the decision gatesRead the answer and worked solution →Slice the true resultsRead the answer and worked solution →Assign or compareRead the answer and worked solution →Sort the Python piecesRead the answer and worked solution →Type the answerRead the answer and worked solution →Decisions bingoRead the answer and worked solution →

Worked practice questions

A quiz app stores whether a player passed. The data type it should use is:

  1. bool
  2. list
  3. dict
  4. file
Show answer and solution

Correct answer: A. bool

1. The answer is only yes or no. 2. One data type holds exactly two values. 3. That type is bool. _Source: OpenStax Introduction to Python Programming, Chapter 4._

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A login screen checks whether user equals admin. The comparison returns:

  1. Open or Shut
  2. True or False
  3. Text or Digit
  4. Name or Email
Show answer and solution

Correct answer: B. True or False

1. Comparison operators test a relationship. 2. The answer is always one of two values. 3. So it returns True or False. _Source: OpenStax Introduction to Python Programming, Chapter 4._

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A coder writes is_zero = num = 0 and every value gets wiped. His mistake was using:

  1. One equals sign
  2. Two equals signs
  3. Three equals signs
  4. Four equals signs
Show answer and solution

Correct answer: A. One equals sign

1. Assignment and comparison look alike but differ. 2. A single equals sign assigns instead of testing. 3. So he used one equals sign. _Source: OpenStax Introduction to Python Programming, Chapter 4._

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More Computer Science topics

Computer ScienceOlympiad Computer ScienceData Structures and AlgorithmsInterview PrepModels of ComputationProgramming LanguagesPython Strings Lists and Tuples