Computer Science for IGCSE & O level - Programming (Section 9)
1
What do parameters do in functions or procedures?
Απάντηση
(B)
They receive data passed into the function or procedure.
2
In the context of file handling, what does 'WRITE' typically signify?
Απάντηση
(D)
Write data into a file.
3
What is the primary purpose of storing data in a file?
Απάντηση
(B)
To store data persistently for later use.
4
Which statement is used to select one option out of multiple options?
Απάντηση
(C)
CASE statement
5
What is the name for a named storage location in a computer's memory?
Απάντηση
(B)
Variable
6
What is the result of this comparison: `5 <= 5`?
Απάντηση
(A)
True
7
What is a common characteristic of a well-designed algorithm?
Απάντηση
(C)
It should be efficient and solve the problem correctly.
8
What is the benefit of using comments in code?
Απάντηση
A
B
9
What is the purpose of the `ELSE` statement in an `IF` statement?
Απάντηση
(B)
To specify the actions to be taken if the `IF` condition is false.
10
Which of the following are important aspects when writing a file?
Απάντηση
A
B
C
11
What is the primary function of a loop in programming?
Απάντηση
(B)
To execute a block of code repeatedly.
12
If you wanted to store the ages of students and their corresponding grades in an organized format, what type of structure would you use?
Απάντηση
(C)
A two-dimensional array.
13
If `Value1 = MOD(20, 3)`, what is the value of `Value1`?
Απάντηση
(D)
2
14
What is the result of the following operation: 10 % 3?
Απάντηση
(A)
1
15
What is the primary difference between an `INTEGER` and a `REAL` data type?
Απάντηση
(B)
INTEGER stores whole numbers, REAL stores numbers with decimal points.
16
In the context of programming, what is a variable?
Απάντηση
(B)
A named data store that holds a value that can change.
17
Which statement is used in programming to execute a block of code multiple times?
Απάντηση
(D)
FOR, WHILE
18
What is the purpose of a 'loop' in programming?
Απάντηση
(B)
To execute a block of code repeatedly.
19
What is the role of comments in a program?
Απάντηση
(C)
To explain the code to humans.
20
Which data type is most suitable for storing True/False values?
Απάντηση
(C)
Boolean
21
What is a step-by-step set of instructions used for solving a problem?
Απάντηση
(C)
An algorithm.
22
What does the term "iteration" primarily refer to in programming?
Απάντηση
(B)
The repetition of a set of instructions
23
Why is it important to use clear and meaningful identifiers (variable names, function names, etc.)?
Απάντηση
(C)
To improve the code's readability and maintainability.
24
Which of the following statements represents an input operation?
Απάντηση
(B)
name = input()
25
What is the purpose of a 'comment' in a program?
Απάντηση
(B)
To provide an explanation or description of the code.
26
Which of the following best describes the purpose of comments in code?
Απάντηση
(C)
To provide documentation for the code.
27
Which of the following is a characteristic of high-level programming languages?
Απάντηση
B
C
28
What does an IDE primarily offer to programmers?
Απάντηση
A
B
C
29
What would be an appropriate data type to store a person's name?
Απάντηση
(C)
String
30
Which statement represents a logical decision in a program?
Απάντηση
(C)
IF x > 10 THEN
31
Which of these elements can be found in a procedure definition?
Απάντηση
A
B
D
32
In the context of arrays, what does the term "index" refer to?
Απάντηση
(C)
The position of each element within the array.
33
What keyword is commonly used to start a comment in Python, based on the provided examples?
Απάντηση
(C)
#
34
Which string method is used to find the number of characters in a string?
Απάντηση
(A)
Length
35
What is the role of the `NumOfSubjects` constant in the code?
Απάντηση
(C)
To set a fixed value for a number of subjects.
36
What is the process of finding and fixing errors in a program called?
Απάντηση
(B)
Debugging
37
What are the key components of a standard programming environment?
Απάντηση
(A)
Text editor, compiler, and debugger
38
If the 'age' input is 20, what output will the following code produce?
```
IF age >= 17
THEN
Print "You are an adult"
ELSE
Print "You are a child"
ENDIF
```
Απάντηση
(B)
You are an adult
39
What does the MOD function calculate in programming?
Απάντηση
(C)
The remainder of a division.
40
What is a key benefit of using nested statements (e.g., an IF statement inside another IF statement)?
Απάντηση
(C)
It allows for more complex and detailed logic.
41
What does the following Python code do? `myFile = open('myText.txt', 'r')`
Απάντηση
(B)
Opens a file named 'myText.txt' for reading.
42
Which string method can be used to find the location of a certain character in a string?
Απάντηση
(C)
Find
43
Which is true about nesting selection statements?
Απάντηση
(B)
It can enhance code's modularity and structure.
44
What is the purpose of the 'length' string function?
Απάντηση
(B)
To return the number of characters in a string.
45
What is a key characteristic of a procedure, as described in the provided text?
Απάντηση
(C)
It is a set of programming statements grouped together under a single name.
46
What is a 'subroutine' also known as?
Απάντηση
(C)
Function or Procedure
47
What is the objective of the 'Worked example' at the beginning of the document?
Απάντηση
(B)
To calculate and output statistics for a class of students.
48
Which character is typically used as the multiplication operator?
Απάντηση
(B)
*
49
In the pseudocode example for writing to a file, which command is used to write a line of text?
