In a Java program, where does the program start executing?
Απάντηση
(B)
In the main method
16
What is the main difference between a local and a global variable?
Απάντηση
(C)
Local variables are declared inside a function, and global variables are declared outside any function.
17
When designing an algorithm, what should you consider first?
Απάντηση
(B)
The desired output and the steps needed to achieve it.
18
Which of the following is a characteristic of a good algorithm?
Απάντηση
(B)
It should be efficient and produce the correct output.
19
What is the output of `print(10 // 3)`?
Απάντηση
(B)
3
20
Which of the following are considered string handling methods?
Απάντηση
A
B
21
What is the primary advantage of using nested loops in programming?
Απάντηση
(B)
To repeat a set of instructions multiple times for different levels of iteration.
22
In file handling, what is the purpose of closing a file?
Απάντηση
(C)
To release system resources.
23
Which of these is an example of a valid variable assignment in Python?
Απάντηση
(B)
name = "John"
24
What is a benefit of using a high-level programming language over a low-level programming language?
Απάντηση
(C)
Easier to write and understand.
25
What data type would be used to store the value 'True' or 'False'?
Απάντηση
(C)
Boolean
26
What is the main purpose of comments in programming?
Απάντηση
(B)
To provide explanations about the code.
27
How can you make your program easier to modify and update (more maintainable)?
Απάντηση
(B)
By using meaningful variable names and comments.
28
In a program dealing with student data, what is the likely purpose of a constant declared as `MAX_SUBJECTS`?
Απάντηση
(B)
To define the maximum number of subjects a student can take.
29
Why is modular programming beneficial?
Απάντηση
(C)
It helps with code reuse and makes code easier to manage.
30
In the example given (total and counting), what data structure is being used?
Απάντηση
(B)
Variables
31
What is the purpose of the `FOR` loop in the context of student and subject marks?
Απάντηση
(C)
To iterate through a specified number of subjects or students.
32
What is an 'operand' in a programming context?
Απάντηση
(B)
A variable or value that an operator acts upon.
33
Which data type is used to represent text in programming?
Απάντηση
(C)
String
34
In a one-dimensional array, what typically represents the first element's index in most programming languages?
Απάντηση
(C)
0
35
Which data type is most suitable for storing the number of hours worked?
Απάντηση
(D)
INTEGER
36
Which programming concept is used to repeatedly execute a block of code?
Απάντηση
(C)
Iteration
37
If you want to find the largest value in a set of numbers, what programming construct would you use?
Απάντηση
(A)
A loop combined with a conditional statement.
38
What distinguishes local variables from global variables?
Απάντηση
(C)
Local variables are only accessible within the block (e.g., function) where they are declared; global variables can be accessed throughout the program.
39
What is the purpose of the `OR` operator in a conditional statement?
Απάντηση
(B)
To execute code if at least one condition is true.
40
What does a conditional statement (e.g., `IF-THEN-ELSE`) primarily do?
Απάντηση
(C)
Execute code based on a specific condition.
41
What does DRY stand for in programming principles?
Απάντηση
(A)
Don't Repeat Yourself
42
What is the role of the `break` statement inside a loop?
Απάντηση
(B)
To stop the execution of the loop.
43
What does the `OUTPUT` statement typically require?
Απάντηση
(B)
A variable or expression to display.
44
If you wanted to convert the string "hello" to uppercase, what string handling method would you use?
Απάντηση
(C)
ToUpper()
45
When declaring an array, what determines the maximum number of elements it can hold?
Απάντηση
(C)
The specified size or bounds of the array
46
Which data type is the most suitable for storing someone's age?
Απάντηση
(D)
INTEGER
47
In which programming language can you find the `CASE` statement?
Απάντηση
(D)
All languages that support Selection
48
Which structure is used to execute a piece of code repeatedly?
Απάντηση
(C)
A loop.
49
What is the first line in Python code output?
Απάντηση
(C)
print ('Hello World')
50
Which data type would you use to represent a true or false value in programming?
