Computer Science for IGCSE & O level - Algorithm Design And Problem Solving (Section 10)
1
In the context of an algorithm, what is the function of an 'IF...THEN...ELSE' structure?
Answer(A)
To make a decision based on a condition.
2
What type of validation is exemplified by ensuring a user enters a numerical value, not text, into a field designed for numbers?
3
What is the primary goal of a type check?
Answer(A)
To make sure the data entered is the correct type.
4
In the alarm clock algorithm, how does the algorithm know when to trigger the alarm sound?
Answer(B)
When the current time equals the alarm time.
5
What are the key considerations in designing data validation methods?
6
Which types of data should be used to check if a program functions correctly during data entry?
7
Which of the following statements are true about a linear search?
8
A type check is primarily used to validate the:
Answer(A)
The type of data entered (e.g., numeric, text, boolean).
9
Which of these best describes the role of a check digit?
Answer(C)
Detecting data entry mistakes.
10
Which of the following would be considered an example of extreme data?
Answer(B)
The largest and smallest values that are valid inputs.
11
In pseudocode, what does the term 'FOR...NEXT' usually indicate?
12
What is the role of an IF-THEN-ELSE statement in conditional statements?
Answer(D)
To execute different code blocks based on a condition
13
Which programming stage directly follows the design stage in the program development life cycle?
14
What is the purpose of testing in the program development life cycle?
Answer(C)
To ensure the program meets requirements.
15
In the provided algorithm, what is used to determine whether the password length is acceptable?
Answer(C)
The `PasswordLength` is not equal to eight characters.
16
What is the purpose of data validation?
Answer(B)
To ensure the data is accurate, reliable, and complete.
17
In the context of developing algorithms, what is the main purpose of using the appropriate data types for variables?
Answer(C)
To prevent data errors and ensure the algorithm operates as intended.
18
What is the main objective when using "normal data" for program testing?
Answer(A)
To verify that the program functions correctly with expected inputs.
19
In pseudocode, what does `Counter <- Counter + 1` typically represent?
Answer(C)
Incrementing the counter by 1.
20
Answer(B)
A simple method for showing algorithms that is very similar to code used in a programming language.
21
What are the types of data that can be taken from a computer?
22
What is the conventional sequence of operations applied in check digit calculation?
Answer(C)
Multiplying, adding, then dividing.
23
What does a flowchart use to represent the beginning and end of an algorithm?
24
In a flowchart, what does the shape of a rectangle typically represent?
25
What are the key characteristics involved in searching for a specific item using a linear search?
26
Which data validation technique checks to see if a number is within a specific acceptable range?
27
Which of the following best describes decomposition in the context of problem-solving?
Answer(B)
Breaking down a complex problem into smaller, more manageable parts.
28
What type of shape is used in a flowchart to indicate the start or end point?
29
What steps are commonly involved in bubble sort?
30
Which of the following is the primary purpose of a screen/visual check in data validation?
Answer(A)
To provide the user a chance to check the accuracy of the entered data.
31
What type of check ensures that the entered data contains an appropriate number of characters?
32
Which of the following is an advantage of using pseudocode?
33
What does 'top-down design' typically involve?
Answer(B)
Breaking down the program into smaller sub-systems.
34
What is the purpose of the design stage in the program development life cycle?
Answer(B)
Defining how the program will work, its components, and their relationships.
35
In an algorithm, what do conditional statements primarily help with?
Answer(B)
Executing different actions based on certain conditions.
36
What symbols are used in the flowchart to show the input of data and output of information?
37
In the program development life cycle, what stage typically follows the design stage?
38
What is a key characteristic of extreme data?
Answer(B)
They are the minimum and maximum values.
39
What do trace tables provide during algorithm analysis?
Answer(B)
Step-by-step variable changes during execution.
40
During which stage of the program development life cycle is the actual code written?
41
What is the purpose of using a `CASE OF` structure in an algorithm?
Answer(B)
To select one action from several choices.
42
What process does a check digit typically follow?
43
Which loop structure is most suitable when the number of iterations is unknown and depends on a condition?
44
What is the primary purpose of a format check in the context of data validation?
Answer(B)
To ensure the data conforms to a specific pattern.
45
Which of the following best describes the main purpose of a check digit?
Answer(B)
To detect common errors that may occur during data entry.
46
In the bubble sort algorithm, how is the sorting achieved?
Answer(A)
By comparing and swapping adjacent elements.
47
What does the `THEN` keyword typically introduce in an `IF...THEN...ELSE` structure?
Answer(B)
The set of actions to be taken if the condition is true.
48
What sequence of operations is common in check digit calculations?
Answer(A)
Multiply, add, and divide.
49
What are typical elements that are included in a good validation process?
50
Which data is used to make sure a program handles incorrect inputs well?
