Computer Science for IGCSE & O level - Algorithm Design And Problem Solving (Section 11)
1
Which of the following is NOT a common method of verification?
Răspuns
(C)
Type check
2
What is the purpose of the outermost `FOR` loop in the bubble sort example (i.e., `FOR Index <- 1 TO Length - 1`)?
Răspuns
(B)
To control the number of passes through the list.
3
To test a program for a salary range, from a minimum to a maximum, which data type is most relevant?
Răspuns
(D)
Extreme data
4
When testing a program that calculates an employee's pay, which type of test data should you employ to verify the correct handling of the minimum (e.g., 0 hours worked) and maximum possible hours worked?
Răspuns
(D)
Extreme data
5
In the context of algorithm design, what does the term "verification" primarily refer to?
Răspuns
(C)
Checking that data has been accurately copied from one source to another.
6
Which validation techniques involve a human user checking the data?
Răspuns
B
C
7
In a typical `FOR...TO...NEXT` loop, what happens after the `NEXT` statement is executed?
Răspuns
(B)
The loop variable is incremented, and the loop starts again.
8
In pseudocode, what do you use to assign a value to an item/variable?
Răspuns
(C)
The <- sign
9
To test the boundaries of a program, what data is used?
Răspuns
(C)
Boundary data
10
What are the essential components of data validation techniques?
Răspuns
A
B
C
11
Which of the following is a type of validation check?
Răspuns
(D)
Character check.
12
When sorting data using a bubble sort, the data is typically sorted in which order?
Răspuns
(B)
Ascending or descending order.
13
What does the 'searching using a linear search' standard method of solution involve?
Răspuns
(A)
Comparing each item in a list against a target value until it is found or the end of the list is reached.
14
Which of the following is generally a step in the algorithm design process?
Răspuns
A
B
D
15
What does the algorithm 'totaling' usually aim to achieve?
Răspuns
(B)
Calculating the sum of a set of values.
16
When should a WHILE...DO...ENDWHILE loop be used?
Răspuns
(B)
When the number of iterations is not known and the action must be repeated until a certain condition is met.
17
What is the purpose of the design stage in software development?
Răspuns
(C)
To plan the program's structure and components.
18
What are the different types of checks that a program might include for validation?
Răspuns
A
B
D
19
What aspect of an algorithm is most effectively illustrated through the use of a trace table?
Răspuns
(C)
The step-by-step execution flow and how variables change.
20
Which types of data are used to determine if a program works correctly?
Răspuns
A
B
C
D
21
Check digits mainly help with...
Răspuns
(B)
Spotting data entry mistakes.
22
In the bubble sort example, what would the `Temperature[Index] <= Temperature[Index + 1]` represent?
Răspuns
A
D
23
Which checks are examples of the verification process?
Răspuns
B
C
24
What is the purpose of a 'bubble sort' algorithm?
Răspuns
(B)
To sort a list of items.
25
What is the role of flowlines in a flowchart?
Răspuns
(B)
To specify the sequence of steps in the algorithm.
26
In the `CASE OF` structure, how are the different code blocks selected for execution?
Răspuns
(C)
Based on the value of an expression.
27
What does the 'storage' component of a computer system refer to?
Răspuns
(C)
The data that needs to be stored for future use.
28
What kind of input does the algorithm for validating the percentage mark use?
Răspuns
(B)
An integer.
29
In the context of the alarm clock algorithm, what is the expected behavior of the code within the WHILE loop?
Răspuns
(B)
To repeatedly monitor the time until the condition is met.
30
What is the primary purpose of a structure diagram when designing an algorithm?
Răspuns
(D)
To provide a high-level overview of the algorithm's components and their relationships.
31
What is a key characteristic of an 'algorithm'?
Răspuns
A
B
C
32
What is the role of a presence check in data validation?
Răspuns
(A)
To ensure data is entered into a field.
33
Which of the following is a valid use of the CASE structure?
Răspuns
(B)
To display different messages based on a user's input.
34
What is the role of a structure diagram?
Răspuns
(B)
To visualise and document the structure of the software.
35
In the context of algorithms, what are the typical components of a loop structure?
Răspuns
A
B
C
D
36
When using a linear search to find an item in an unsorted list, what is the worst-case scenario?
Răspuns
(B)
The item is not in the list.
37
In algorithm design, what is the significance of the step that involves ‘constructing your algorithm’?
Răspuns
(C)
To ensure that the algorithm functions correctly and that it will execute.
38
What is the purpose of an algorithm?
Răspuns
(B)
To solve a specific problem.
39
What is the role of a CASE OF statement?
Răspuns
(A)
To choose between many values
40
In the context of data validation, what is a screen/visual check primarily used for?
Răspuns
(C)
To allow the user to visually confirm the data they've entered is correct.
41
Why is boundary data used in the testing phase?
Răspuns
(A)
To test the extreme limits of data input.
42
Which of the following is *not* a common type of validation check?
Răspuns
(D)
Efficiency check
43
Testing an algorithm's performance with expected inputs uses...
Răspuns
(A)
Normal data.
44
What is the purpose of using comments within an algorithm or its code?
Răspuns
(C)
To explain the code to someone else or to yourself later.
45
What is the purpose of using flow lines within a flowchart?
Răspuns
(B)
To denote the flow of execution.
46
Which of the following actions is most crucial for creating reliable algorithms?
Răspuns
(C)
Thorough testing with a range of inputs.
47
What is the function of the 'ELSE' clause in an `IF...THEN...ELSE` structure?
Răspuns
(C)
To define the actions to be taken when the condition is false.
48
Which type of check verifies that the data entered is a number?
Răspuns
(C)
Type Check
49
Which type of check ensures the data entered is of the correct type?
Răspuns
(B)
Type Check
50
What is the function of an algorithm in the context of computing?
Răspuns
(C)
To provide a set of instructions for solving a specific problem.
