Computer Science for IGCSE & O level - Algorithm Design And Problem Solving (Section 14)

• 1

  What does the term "abstraction" refer to in algorithm design?

  Απάντηση

  (A)

  Hiding unnecessary details and focusing on the essential elements.
• 2

  What type of symbol does a flowchart use to represent a decision?

  Απάντηση

  (B)

  Diamond
• 3

  What is the primary objective of applying abnormal data in program testing?

  Απάντηση

  (B)

  To verify the algorithm handles invalid input properly.
• 4

  What can a trace table show?

  Απάντηση

  A

  B

  C
• 5

  Which of the following is the primary use of 'flow lines' within a flowchart?

  Απάντηση

  (B)

  To define the logical flow or sequence of steps.
• 6

  What information can a completed trace table provide?

  Απάντηση

  A

  B

  C
• 7

  In a flowchart, the symbol used for representing a decision or condition is:

  Απάντηση

  (B)

  Diamond
• 8

  What is the purpose of using boundary data when testing an algorithm?

  Απάντηση

  (C)

  To test the algorithm at its operational limits (minimum and maximum values).
• 9

  What is the primary goal of a screen/visual check in data validation?

  Απάντηση

  (B)

  To provide a means for the user to review and confirm the data's accuracy before it's processed.
• 10

  Which of the following loop structures is a pre-condition loop?

  Απάντηση

  (C)

  WHILE...DO...ENDWHILE
• 11

  What are the typical actions involved in a bubble sort?

  Απάντηση

  A

  B

  D
• 12

  In algorithm design, what does 'normal data' represent?

  Απάντηση

  (C)

  Data that is within the expected and valid range.
• 13

  A screen/visual check allows a user to...

  Απάντηση

  (B)

  Review entered data for correctness before it's processed.
• 14

  In the `CASE OF` structure, what happens if none of the cases match the expression?

  Απάντηση

  (C)

  The default option is executed (if present).
• 15

  What does a 'type check' validate?

  Απάντηση

  (D)

  The kind of data entered into a field (e.g., text, number).
• 16

  What control structure would be most appropriate for creating a menu with different options where the user selects one?

  Απάντηση

  (C)

  CASE OF
• 17

  What is the key characteristic of a queue data structure?

  Απάντηση

  (C)

  FIFO (First-In, First-Out) access.
• 18

  What is the main objective of the design stage in the program development life cycle?

  Απάντηση

  (C)

  To create a detailed plan of how the program will function.
• 19

  Which of the following statements best describes the purpose of validation in a computer system?

  Απάντηση

  (B)

  To verify that the data is correct.
• 20

  In the context of the alarm clock example, what type of loop structure is employed?

  Απάντηση

  (C)

  WHILE...DO...ENDWHILE
• 21

  In the provided validation example, what type of check is used before the `OUTPUT 'The student's mark should be in the range 0 to 100, please re-enter the mark'` statement?

  Απάντηση

  (C)

  Range check
• 22

  What is the purpose of validation in algorithm design?

  Απάντηση

  (A)

  To ensure the input data is accurate and complete.
• 23

  What term describes a series of instructions designed to solve a specific problem?

  Απάντηση

  (B)

  Algorithm
• 24

  Which of the following is *not* a typical activity performed by an algorithm?

  Απάντηση

  (C)

  Designing user interfaces.
• 25

  What is the significance of "screen/visual check" in data validation?

  Απάντηση

  (B)

  It involves the end-user checking the data for correctness.
• 26

  What is the overall function described in the given alarm clock example?

  Απάντηση

  (B)

  To continuously monitor the current time and trigger an output based on a condition.