Computer Science for IGCSE & O level - Programming (Section 14)
1
What type of programming statements allows the program to execute different blocks of code based on certain conditions?
Απάντηση
(C)
Selection statements
2
Which of the following is NOT a characteristic of a function in the context of the given material?
Απάντηση
(D)
A function can't have parameters.
3
Which of the following is NOT a string handling method?
Απάντηση
(D)
Multiply
4
What is the purpose of the line: `ClassHigh = 0` in the beginning of the provided code example?
Απάντηση
(A)
To initialize the variable ClassHigh.
5
Which of the following are examples of standard library routines, based on the text?
Απάντηση
A
B
6
What is a characteristic of a pre-condition loop?
Απάντηση
(C)
The condition is checked *before* each iteration.
7
If the function is defined with parameters, what should the call match?
Απάντηση
(A)
Argument should match parameters.
8
Which of the following data types can store true or false values?
Απάντηση
(C)
Boolean
9
What does the pseudocode example `INPUT myText;` do?
Απάντηση
(C)
Takes input from the user and stores it in a variable called 'myText'.
10
Based on the image, arrays can be:
Απάντηση
A
B
11
How do you call a procedure or function with parameters?
Απάντηση
A
B
C
12
Which of these are important features when writing a file?
Απάντηση
A
C
D
13
What are the main components usually found in a "For" loop structure?
Απάντηση
A
B
C
14
What does the acronym 'IDE' stand for?
Απάντηση
(B)
Integrated Development Environment
15
What should you consider when a procedure has parameters?
Απάντηση
(B)
The argument should match the parameters.
16
What is the function of a 'FOR' loop in programming?
Απάντηση
(A)
To execute a block of code repeatedly a specific number of times.
17
What is the primary purpose of nesting selection statements (e.g., an IF statement inside another IF statement)?
Απάντηση
(C)
To enable the implementation of complex conditional logic.
18
Which of the following is an example of an input statement?
Απάντηση
(C)
input("Enter a number:")
19
What is the main function of the `output` statement in the code examples?
Απάντηση
(C)
To display results to the user.
20
What is the purpose of the `CLOSEFILE` statement in file handling?
Απάντηση
(C)
To close the connection to the file.
21
What is a common use case for the 'try...catch' block?
Απάντηση
(B)
To handle potential errors during file operations
22
Which of the following tasks is NOT typically performed by standard library routines (as discussed in the text)?
Απάντηση
(C)
Defining the program's variables.
23
What is a fundamental concept in the context of creating a maintainable program?
Απάντηση
(B)
Using meaningful identifier names.
24
Which type of statement enables a program to make decisions based on the evaluation of an expression?
Απάντηση
(C)
Selection statement
25
In the provided Java code, what is the purpose of `try...catch` blocks?
Απάντηση
(B)
To handle potential errors during file operations
26
What type of programming structure is characterized by loops that have at least one iteration?
Απάντηση
(C)
Post-condition loops.
27
What operation is being performed by the code `NumberOfSacks = NumberOfSacks + 1;` (Counting)?
Απάντηση
(C)
Incrementing the value of NumberOfSacks.
28
What type of loop always has at least one iteration?
Απάντηση
(C)
Do-While loop
29
Which of the following is used to store a single character?
Απάντηση
(C)
Char
30
What is the function of a file object?
Απάντηση
(B)
To represent the file and provide methods for interacting with it.
31
Which logical operator would be used to combine the conditions 'A is true' and 'B is true' to only execute the consequent statements?
Απάντηση
(B)
AND
32
What does the term 'bug' refer to in the context of programming?
Απάντηση
(B)
An error or defect in a program.
33
What happens if there is a nesting of selection statements (IF-ELSE inside another IF-ELSE)?
Απάντηση
(C)
It can create more complex decision-making logic.
34
When a function is defined, what will always be defined as the first statements to be defined?
Απάντηση
(D)
The name of the function or procedure
35
What is the purpose of an algorithm?
Απάντηση
(B)
To provide step-by-step instructions for solving a problem.
36
In the Totaling example (TotalWeight = TotalWeight + Weight), what does 'Weight' represent?
Απάντηση
(B)
The amount to be added to the total weight.
37
Which statements are correct about nested statements?
Απάντηση
A
C
38
Which string handling method is used to find the number of characters in a string?
Απάντηση
(B)
Length
39
In the context of a program, what does 'iteration' refer to?
Απάντηση
(B)
The process of repeating a set of instructions.
40
What is the purpose of the `OPENFILE` command in pseudocode for file handling?
Απάντηση
(C)
To establish a connection with the file.
41
Which operator is used to get the remainder in division?
Απάντηση
(C)
%
42
What is the primary function of selection statements in programming?
Απάντηση
(C)
To make decisions and control program flow based on conditions.
43
What data type would be most appropriate for storing a student's grade (e.g., A, B, C)?
Απάντηση
(C)
STRING
44
What operation does the following line of pseudo-code perform? `studentAverage = studentTotal / numOfSubjects`
Απάντηση
(B)
Calculates the average mark of a student.
45
What does the inner loop of the program, as described in the 'Worked Example,' primarily calculate?
Απάντηση
(C)
The total marks for each student.
46
In the code examples, which language uses `dim` and `console.writeline`?
Απάντηση
(B)
Visual Basic
47
In Java, what is used to create an object for writing into a file?
Απάντηση
(C)
FileWriter
48
What kind of loop is used for iteration in the examples given?
Απάντηση
(A)
FOR...NEXT loop
49
What will be the output when `age` is 20, given the following code?
```
IF age >= 17
THEN
Print "You are an adult"
ELSE
Print "You are a child"
ENDIF
```
Απάντηση
(B)
You are an adult
50
Which loop structure is known for checking the condition at the *end* of the loop?
