Computer Science for IGCSE & O level - Algorithm Design And Problem Solving (Section 13)
1
Normal data is described as?
Trả lời
(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?
Trả lời
(D)
Extreme data
3
In what situation would you use boundary data?
Trả lời
(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?
Trả lời
(C)
Understanding the requirements and defining the problem.
5
Which of the following can cause an incorrect output in a trace table?
Trả lời
A
B
C
6
What is data validation primarily concerned with?
Trả lời
(C)
Ensuring data meets certain criteria before use.
7
What should be tested using normal data?
Trả lời
(C)
Expected results
8
Which of the following statements is true regarding the use of flowcharts and pseudocode?
Trả lời
A
B
9
Which of the following is an example of input for an alarm app?
Trả lời
(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?
Trả lời
(B)
Presence check
11
In the provided algorithm for checking password length, what action is taken if the password does not meet the criteria?
Trả lời
(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?
Trả lời
(C)
To select different actions based on a condition.
13
What is an advantage of using pseudocode?
Trả lời
(B)
It is simple to understand and allows algorithms to be easily expressed.
14
What validation techniques use human input?
Trả lời
C
D
15
What is the main function of the coding phase in the program development life cycle?
Trả lời
(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?
Trả lời
(B)
Oval
17
What does the term 'pseudocode' represent in the context of algorithms?
Trả lời
(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”`?
Trả lời
(D)
Length check
19
What is the primary function of 'INPUT' and 'OUTPUT' statements in pseudocode?
Trả lời
(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?
Trả lời
A
B
C
21
Normal data is used to test the algorithm in which of the following scenario?
Trả lời
(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?
Trả lời
(C)
Presence check
23
What is the purpose of a check digit in data entry?
Trả lời
(C)
To identify errors made during data entry.
24
When is the 'REPEAT...UNTIL' loop most appropriate to use?
Trả lời
(B)
When the loop should run at least once.
25
What can be tested using abnormal data?
Trả lời
A
D
26
Which of the following best describes "normal data"?
Trả lời
(C)
Data that the algorithm is expected to handle without errors.
27
What is a common use of the IF-THEN-ELSE construct?
Trả lời
(C)
To handle different situations based on a condition.
28
Which loop type guarantees that the loop body will execute at least once?
Trả lời
(C)
REPEAT...UNTIL
29
What does 'iteration' refer to in the context of coding and testing?
Trả lời
(C)
Repeating a process until a condition is met.
30
Which types of data are used when testing a program's robustness?
Trả lời
B
C
D
31
What is the core functionality of a check digit?
Trả lời
(B)
To detect errors that may occur during data entry.
32
What is the primary goal of applying abnormal test data?
Trả lời
(C)
To determine if the algorithm responds correctly to invalid input.
33
What is a primary characteristic of the FOR...TO...NEXT loop?
Trả lời
(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?
Trả lời
(C)
WHILE...DO...ENDWHILE loop and IF statement
35
What does a format check ensure about the entered data?
Trả lời
(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'?
Trả lời
(C)
Storing and removing alarm times.
37
Which methods can be used for the validation phase?
Trả lời
A
B
C
D
38
During data entry, which method allows a user to review the data and confirm its accuracy before submission?
Trả lời
(C)
A screen/visual check
39
Which symbol in a flowchart represents a decision?
Trả lời
(C)
Diamond
40
Which type of validation check is used to ensure data falls within a specific range?
Trả lời
(B)
Range check
41
What do `INPUT` and `OUTPUT` statements primarily facilitate in an algorithm?
Trả lời
A
C
42
Which checks are used during the data validation stage?
Trả lời
A
B
C
43
Which of the following is most often used to represent the starting point in a flowchart?
Trả lời
(C)
An oval
44
What are the characteristics of extreme data?
Trả lời
(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?
Trả lời
(C)
Boundary data
46
What's the primary objective of employing a screen/visual check during data validation?
Trả lời
(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?
Trả lời
(C)
Trigger an event at a predetermined time.
48
In the context of program development, what does the analysis stage primarily involve?
Trả lời
(C)
Understanding the problem and specifying requirements.
49
Which of the following is a common characteristic of pseudocode?
Trả lời
(C)
It uses an informal high-level description of algorithms.
50
Which techniques are designed to verify that the data entered is accurate?
