Computer Science for IGCSE & O level - Programming (Section 12)
1
What is the role of the 'return' statement in a function?
Απάντηση
(C)
To end the function and return a value.
2
In the "Totaling" example, the value of TotalWeight is being increased by what?
Απάντηση
(A)
Weight
3
What does the `'''` notation usually denote in Python?
Απάντηση
(B)
A multi-line comment
4
What is a characteristic feature of a pre-condition loop?
Απάντηση
(B)
The condition is checked before each iteration.
5
In the provided pseudo-code, what data type is used for the variables 'studentHigh', 'studentLow', and 'studentTotal'?
Απάντηση
(B)
INTEGER
6
What is the value that needs to be provided for return to the user?
Απάντηση
(C)
Return Value
7
What is the primary role of a debugger?
Απάντηση
(C)
To find and fix errors in code.
8
What are potential benefits of using an IDE for programming?
Απάντηση
A
B
C
9
If a program contains nested statements, what is the relation between the outer and inner statements?
Απάντηση
(B)
The inner statement is executed only when the condition of the outer statement is met.
10
What is meant by the term 'iteration' in the context of a programming loop?
Απάντηση
(C)
A single execution of the code block within the loop.
11
What is the outcome of the given code using count-controlled loop:
```
For number to 10 to 50 Step 5
Console.WriteLine(number)
Next number
```
Απάντηση
(A)
Prints numbers from 10 to 50 increasing by 5.
12
What does the text suggest about the structure of a programming language's standard library?
Απάντηση
(B)
It includes a standard library of functions and procedures.
13
If the following code is executed and age is 17:
```
IF age >= 17
THEN
Print "You are an adult"
ELSE
Print "You are a child"
ENDIF
```
What will be the output?
Απάντηση
(B)
You are an adult
14
What is the main function of the 'Uppercase' string handling method?
Απάντηση
(B)
To convert all the characters in a string to uppercase.
15
What is the role of parameters in a procedure or function?
Απάντηση
(A)
They store the values of the arguments passed to the procedure or function.
16
In the provided pseudocode, what is the stopping condition for the loop?
Απάντηση
(B)
When 'Finish' reaches 300.
17
In Java, what type of object is usually created when working with files for writing?
Απάντηση
(C)
FileWriter
18
What is the meaning of `CALL` in the provided context?
Απάντηση
(B)
To execute a function or procedure.
19
What is the main advantage of nesting selection statements?
Απάντηση
(C)
It allows you to express complex conditions.
20
What is the function of the nested loop in this algorithm?
Απάντηση
(D)
To calculate total of marks of students.
21
What happens when you open a file in append mode ('a')?
Απάντηση
(D)
New content is added at the end of the file.
22
Which of these statements is not a part of a function definition?
Απάντηση
(C)
The name of the variable
23
What does the pseudo-code example use to define the number of students and the number of subjects?
Απάντηση
(B)
Constants.
24
Which statement is correct regarding the selection statements in programming languages?
Απάντηση
(A)
Selection statements allow different routes through the steps of a program.
25
Which logical operator yields TRUE only when *either* or *both* operands are TRUE?
Απάντηση
(B)
OR
26
In the context of file handling, what does the 'w' mode signify when opening a file (e.g., `myFile = open('example.txt', 'w')`)?
Απάντηση
(B)
Write mode
27
What does the outer loop iterate through in the given pseudo-code examples?
Απάντηση
(C)
The number of students.
28
In the context of the 'Worked example,' what does the term 'average mark' refer to?
Απάντηση
(C)
The average mark of each student, calculated by dividing the student's total marks by the number of subjects.
29
What is the purpose of the 'Counter' variable in the given pseudocode example?
Απάντηση
(B)
To keep track of the number of marks entered.
30
Based on the provided text, what is the main purpose of the algorithm?
Απάντηση
(A)
To calculate and output highest, lowest, and average marks for a class of students.
31
In a CASE statement, what happens if none of the cases match the expression?
Απάντηση
(B)
The code inside the ELSE or default case (if present) is executed.
32
What is the main concept of a reusable code?
Απάντηση
(C)
Writing code only once.
33
In a nested selection (IF-ELSE inside another IF-ELSE), what is the term used to refer to the inner statements?
Απάντηση
(C)
Nested statements
34
What type of loop is illustrated by the following code snippet?
```
REPEAT
Statement(s)
UNTIL condition
```
Απάντηση
(C)
Post-condition loop
35
In Java, when are you required to import `java.io.File`?
Απάντηση
(D)
All of the above
36
What is the primary purpose of the `Substring` method?
Απάντηση
(B)
To extract a portion of a string.
37
In pseudocode, what is the main purpose of using 'OPENFILE'?
Απάντηση
(C)
To establish a connection to the file
38
What is the first task mentioned in the 'Worked example'?
Απάντηση
(C)
Calculate and output highest, lowest, and average marks for a class.
39
Which of these is NOT a common file operation discussed?
Απάντηση
(D)
Deleting a file
40
Which of the following can be part of an arithmetic expression?
Απάντηση
A
B
C
41
What does the NOT logical operator do?
Απάντηση
(C)
It reverses the logical value of an expression.
42
What happens if the value of a variable doesn't match any of the cases in a CASE statement, and there is no default clause?
Απάντηση
(C)
The program continues to the next statement after the CASE block.
43
What does the code calculate at the end of the outer loop, in the "Worked example"?
Απάντηση
(B)
Highest and lowest marks for each student.
44
In the provided examples, which elements help in making the code modular?
Απάντηση
(C)
Procedures and functions
45
What is the key characteristic of a local variable?
Απάντηση
(C)
It is only accessible within the block in which it is defined.
46
What does a two-dimensional array store?
Απάντηση
(B)
A table of values with rows and columns.
47
What is one of the uses of library routines?
Απάντηση
(C)
To perform standard tasks.
48
What is generally considered the first step in interacting with a file in most programming languages?
Απάντηση
(D)
Opening the file.
49
What does the algorithm output at the end?
Απάντηση
(D)
All of the above.
50
In the context of programming, what does "iteration" refer to?
