Computer Science for IGCSE & O level - Algorithm Design And Problem Solving (Section 13)
1
Normal data is described as?
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(B)
A set of data expected to provide expected output.
2
When testing a program that calculates the area of a rectangle, which data set would you use to ensure the program works correctly with the minimum and maximum possible lengths and widths?
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(D)
Extreme data
3
In what situation would you use boundary data?
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(B)
If you need to input the largest value the system will accept.
4
What is the primary goal of the analysis phase in the software development life cycle?
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(C)
Understanding the requirements and defining the problem.
5
Which of the following can cause an incorrect output in a trace table?
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A
B
C
6
What is data validation primarily concerned with?
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(C)
Ensuring data meets certain criteria before use.
7
What should be tested using normal data?
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(C)
Expected results
8
Which of the following statements is true regarding the use of flowcharts and pseudocode?
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A
B
9
Which of the following is an example of input for an alarm app?
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(B)
The time set for the alarm.
10
What type of data validation is utilized to prevent a missing input, such as the name field in a registration form?
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(B)
Presence check
11
In the provided algorithm for checking password length, what action is taken if the password does not meet the criteria?
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(C)
A specific message is displayed to the user.
12
In the context of the provided examples, what is the purpose of using an 'IF...THEN...ELSE' statement within an algorithm?
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(C)
To select different actions based on a condition.
13
What is an advantage of using pseudocode?
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(B)
It is simple to understand and allows algorithms to be easily expressed.
14
What validation techniques use human input?
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C
D
15
What is the main function of the coding phase in the program development life cycle?
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(C)
To translate the design into a programming language.
16
Which symbol is typically used in a flowchart to represent the start and end points?
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(B)
Oval
17
What does the term 'pseudocode' represent in the context of algorithms?
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(D)
An informal way of describing an algorithm's steps using plain language and simple programming constructs.
18
What type of check is exemplified by the algorithm: `IF PasswordLength != 8 THEN OUTPUT “Your password must be exactly eight characters”`?
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(D)
Length check
19
What is the primary function of 'INPUT' and 'OUTPUT' statements in pseudocode?
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(D)
To receive data and show results.
20
Which of the following methods can be used to design and construct a solution to a problem?
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A
B
C
21
Normal data is used to test the algorithm in which of the following scenario?
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(A)
To check if the algorithm provides the correct results for valid inputs.
22
Which validation technique aims to ensure that a required field, like a phone number, has been filled in by the user?
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(C)
Presence check
23
What is the purpose of a check digit in data entry?
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(C)
To identify errors made during data entry.
24
When is the 'REPEAT...UNTIL' loop most appropriate to use?
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(B)
When the loop should run at least once.
25
What can be tested using abnormal data?
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A
D
26
Which of the following best describes "normal data"?
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(C)
Data that the algorithm is expected to handle without errors.
27
What is a common use of the IF-THEN-ELSE construct?
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(C)
To handle different situations based on a condition.
28
Which loop type guarantees that the loop body will execute at least once?
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(C)
REPEAT...UNTIL
29
What does 'iteration' refer to in the context of coding and testing?
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(C)
Repeating a process until a condition is met.
30
Which types of data are used when testing a program's robustness?
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B
C
D
31
What is the core functionality of a check digit?
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(B)
To detect errors that may occur during data entry.
32
What is the primary goal of applying abnormal test data?
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(C)
To determine if the algorithm responds correctly to invalid input.
33
What is a primary characteristic of the FOR...TO...NEXT loop?
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(B)
It repeats a set of instructions a specified number of times.
34
In the alarm clock example, which construct is used to ensure the alarm will only go off at the pre-determined time?
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(C)
WHILE...DO...ENDWHILE loop and IF statement
35
What does a format check ensure about the entered data?
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(C)
That the data conforms to a specific pattern or structure.
36
In the context of designing an alarm app, what would be considered 'processes'?
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(C)
Storing and removing alarm times.
37
Which methods can be used for the validation phase?
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A
B
C
D
38
During data entry, which method allows a user to review the data and confirm its accuracy before submission?
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(C)
A screen/visual check
39
Which symbol in a flowchart represents a decision?
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(C)
Diamond
40
Which type of validation check is used to ensure data falls within a specific range?
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(B)
Range check
41
What do `INPUT` and `OUTPUT` statements primarily facilitate in an algorithm?
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A
C
42
Which checks are used during the data validation stage?
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A
B
C
43
Which of the following is most often used to represent the starting point in a flowchart?
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(C)
An oval
44
What are the characteristics of extreme data?
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(B)
The highest and lowest allowable values.
45
Which type of test data would you use to determine whether a program correctly handles the edge cases or limitations of its input values?
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(C)
Boundary data
46
What's the primary objective of employing a screen/visual check during data validation?
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(A)
To allow the user to visually confirm the accuracy of the data prior to submission.
47
What does an algorithm in the context of an alarm clock generally aim to do?
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(C)
Trigger an event at a predetermined time.
48
In the context of program development, what does the analysis stage primarily involve?
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(C)
Understanding the problem and specifying requirements.
49
Which of the following is a common characteristic of pseudocode?
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(C)
It uses an informal high-level description of algorithms.
50
Which techniques are designed to verify that the data entered is accurate?
