Computer Science for IGCSE & O level - Algorithm Design And Problem Solving (Section 14)
1
What does the term "abstraction" refer to in algorithm design?
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(A)
Hiding unnecessary details and focusing on the essential elements.
2
What type of symbol does a flowchart use to represent a decision?
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(B)
Diamond
3
What is the primary objective of applying abnormal data in program testing?
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(B)
To verify the algorithm handles invalid input properly.
4
What can a trace table show?
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A
B
C
5
Which of the following is the primary use of 'flow lines' within a flowchart?
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(B)
To define the logical flow or sequence of steps.
6
What information can a completed trace table provide?
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A
B
C
7
In a flowchart, the symbol used for representing a decision or condition is:
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(B)
Diamond
8
What is the purpose of using boundary data when testing an algorithm?
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(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?
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(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?
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(C)
WHILE...DO...ENDWHILE
11
What are the typical actions involved in a bubble sort?
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A
B
D
12
In algorithm design, what does 'normal data' represent?
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(C)
Data that is within the expected and valid range.
13
A screen/visual check allows a user to...
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(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?
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(C)
The default option is executed (if present).
15
What does a 'type check' validate?
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(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?
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(C)
CASE OF
17
What is the key characteristic of a queue data structure?
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(C)
FIFO (First-In, First-Out) access.
18
What is the main objective of the design stage in the program development life cycle?
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(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?
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(B)
To verify that the data is correct.
20
In the context of the alarm clock example, what type of loop structure is employed?
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(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?
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(C)
Range check
22
What is the purpose of validation in algorithm design?
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(A)
To ensure the input data is accurate and complete.
23
What term describes a series of instructions designed to solve a specific problem?
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(B)
Algorithm
24
Which of the following is *not* a typical activity performed by an algorithm?
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(C)
Designing user interfaces.
25
What is the significance of "screen/visual check" in data validation?
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(B)
It involves the end-user checking the data for correctness.
26
What is the overall function described in the given alarm clock example?
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(B)
To continuously monitor the current time and trigger an output based on a condition.
