Computer Science for IGCSE & O level - Programming (Section 4)
1
What is the value of `x` after the code: `x = 5; x += 3;`?
Απάντηση
(D)
8
2
What is the output when using the code: `print "Computer".Substring(3,4)`?
Απάντηση
(D)
mpute
3
What is a disadvantage of using global variables extensively?
Απάντηση
(B)
They can be easily accessed by any part of the program, leading to potential unintended modifications.
4
Which programming concept allows a program to make decisions?
Απάντηση
(B)
Selection
5
Which of the following features are parts of an algorithm?
Απάντηση
A
B
C
D
6
What is the primary goal of program documentation?
Απάντηση
(B)
To make the code more readable.
7
What does the acronym 'GUI' stand for?
Απάντηση
(B)
Graphical User Interface
8
Which of the following is a characteristic of a good programming practice?
Απάντηση
(C)
Giving descriptive names to variables
9
What will `print("Python"[2:])` output?
Απάντηση
(C)
thon
10
In a pseudo-code program, what is the purpose of a PROCEDURE?
Απάντηση
(B)
To group a set of statements to perform a specific task.
11
What data structure is described as containing several elements of the same data type, where each element can be accessed using the same identifier name?
Απάντηση
(B)
Array
12
What is the function of `OUTPUT` in programming?
Απάντηση
(B)
To display data to the user.
13
Which of the following is NOT a common string method?
Απάντηση
(C)
Append
14
In the context of programming, what is a 'bug'?
Απάντηση
(B)
An error in the code.
15
What does the algorithm need in order to do output?
Απάντηση
(B)
Input
16
Which data type would be most appropriate for storing the number of students in a class?
Απάντηση
(D)
INTEGER
17
Which is the correct syntax to call a procedure named 'CalculateMarks'?
Απάντηση
(B)
CALL CalculateMarks
18
What type of statement allows a program to choose between different actions based on a condition?
Απάντηση
(B)
Selection Statement
19
What does 'scope' refer to in relation to variables?
Απάντηση
(B)
Where a variable is accessible within the code.
20
Which programming paradigm is likely being used based on the presented examples?
Απάντηση
(C)
Procedural Programming
21
What is the purpose of the `+=` operator in Python (or similar operators in other languages)?
Απάντηση
(C)
To add a value to a variable and assign the result to the same variable.
22
What does the term 'sequence' refer to in the context of an algorithm?
Απάντηση
(B)
The order in which steps are executed.
23
What is the role of a parameter within a function or procedure?
Απάντηση
(C)
To receive data that is passed into the function or procedure.
24
What is the role of the `DIV` library routine?
Απάντηση
(B)
To return the quotient (whole number) of a division.
25
Why is it beneficial to use descriptive identifier names?
Απάντηση
(C)
It improves the code's readability and maintainability.
26
In the context of programming, what does 'modularity' refer to?
Απάντηση
(C)
Breaking down a program into smaller, self-contained, and reusable modules.
27
What type of loop is used to repeat a block of code as long as a condition is true?
Απάντηση
(B)
WHILE loop
28
Which string function is typically used to locate a specified character or substring within a string?
Απάντηση
(C)
Index or Find
29
What does the term 'index' refer to when discussing arrays?
Απάντηση
(C)
The location of an element within the array.
30
What is the purpose of debugging in programming?
Απάντηση
(B)
To test and fix errors in the code.
31
In the provided pseudo-code snippets, what does the constant `NumberSubjects` likely represent?
Απάντηση
(C)
The total number of subjects a student is taking.
32
What is the correct data type for a value that can store decimal numbers?
Απάντηση
(D)
Double/Real
33
In the context of the program, what does the constant `NumberSubjects` likely represent?
Απάντηση
(B)
The number of subjects a student takes.
34
In the provided context of student mark calculations, what is the likely purpose of the variable `studentTotal`?
Απάντηση
(B)
The total marks obtained by a student.
35
What is the main role of a programming language's syntax?
Απάντηση
(A)
To define the rules for writing valid statements.
36
What data type is typically used to store a whole number?
Απάντηση
(B)
Integer
37
What does the assignment operator do?
Απάντηση
(C)
Assigns a value to a variable
38
What is the term for the process of repeating a set of instructions in a program?
Απάντηση
(B)
Iteration
39
Which of the following is an example of a logical operator?
Απάντηση
(C)
AND
40
Which of the following best describes an 'algorithm'?
Απάντηση
(B)
A set of instructions for a specific task.
41
Which one is a comment feature in the Python language?
Απάντηση
(C)
'# '
42
What is the purpose of an 'IF' statement in programming?
Απάντηση
(B)
To make decisions based on a condition.
43
What does the acronym "GUI" stand for?
Απάντηση
(A)
Graphical User Interface
44
In pseudo code, what is the purpose of the keyword "OUTPUT"?
Απάντηση
(B)
To display information to the user.
45
In the provided pseudocode, what does the value 999 represent?
Απάντηση
(C)
A delimiter to finish the loop
46
What is the purpose of indentation in Python?
Απάντηση
(D)
All of the above
47
What is the range of values for a boolean data type?
Απάντηση
(B)
True or False
48
What is the output of the code: `print(type(True))`
Απάντηση
(C)
49
What does the term 'selection' refer to in programming?
Απάντηση
(C)
Choosing different paths of code execution.
50
If a function needs to return multiple values, what is one common way to achieve this in programming?
Απάντηση
(C)
Return a single array or object containing the multiple values.
