Computer Science for IGCSE & O level - Programming (Section 13)
1
Which of the following are typical components of a file handling process?
Απάντηση
A
B
C
2
What does the `import java.io.File` statement do in Java?
Απάντηση
(A)
Imports the file class
3
What happens if you attempt to read from a file that hasn't been opened first?
Απάντηση
(C)
An error will likely occur.
4
Based on the information given, a one-dimensional array can also be referred to as:
Απάντηση
(B)
A list
5
Which operator is typically used to represent 'not equal to' in most programming languages?
Απάντηση
(A)
!=
6
Which of the following components are crucial for the file handling procedure?
Απάντηση
B
C
D
7
Which of the following statements is true about file storage?
Απάντηση
B
C
D
8
Which of the following best describes a global variable?
Απάντηση
(B)
It can be used by any part of the program.
9
What does the `READFILE` statement in the pseudocode signify in the context of file handling?
Απάντηση
(C)
Reads a line from the file.
10
Which of the following are common data types used in programming?
Απάντηση
A
B
C
D
11
What does DRY stand for in programming principles?
Απάντηση
(A)
Don't Repeat Yourself
12
Which of the following is a purpose of comments in the program?
Απάντηση
(B)
They help in code readability.
13
In the pseudocode, what does the line `AVERAGE = TOTAL / COUNTER` calculate?
Απάντηση
(C)
The average of the marks.
14
What is the correct keyword for declaring a constant?
Απάντηση
(C)
CONST
15
What does the program compute after the completion of the outer loop? (FOR Student = 1 TO NumOfStudents)
Απάντηση
(D)
All of the above
16
Which of the following are important aspects of code readability?
Απάντηση
A
B
C
17
Which logical operator would result in TRUE only if *both* operands are TRUE?
Απάντηση
(B)
AND
18
If the value of 'age' is 10 and the following code executes, what will be printed?
```
IF age >= 17
THEN
Print "You are an adult"
ELSE
Print "You are a child"
ENDIF
```
Απάντηση
(A)
You are a child
19
What is the result if a CASE statement has no matching case, and no default (or ELSE) clause?
Απάντηση
(C)
The program continues execution after the CASE block.
20
Which of the following is considered a control structure?
Απάντηση
(C)
Loops
21
What does the `Uppercase` method usually do in string manipulation?
Απάντηση
(C)
Convert a string to uppercase.
22
What does the term 'scope' refer to in programming?
Απάντηση
(C)
The part of the program where a variable is accessible.
23
What is typically required before writing to a file in most programming languages?
Απάντηση
(B)
Opening the file in write mode
24
What is the purpose of comments in programming?
Απάντηση
(B)
To improve code readability and explain the code.
25
In the pseudocode example, the variable 'COUNTER' is incremented in each iteration. What is the role of COUNTER?
Απάντηση
(C)
To count the number of marks entered.
26
What will be calculated by the inner loop, for each student, during the nested loop structure?
Απάντηση
(C)
The sum of all the marks obtained in all subjects.
27
What would be the appropriate data type for the variable used to store a student's name?
Απάντηση
(C)
STRING
28
What is one of the first steps involved in writing to a file?
Απάντηση
(C)
Opening the file.
29
What does the 'a' mode stand for when opening a file?
Απάντηση
(C)
Append mode
30
What is the purpose of comments in a program?
Απάντηση
(C)
To explain the code to humans.
31
What is the purpose of an algorithm?
Απάντηση
(B)
To provide a set of instructions to solve a problem.
32
What is a procedure also known as?
Απάντηση
(C)
A subroutine
33
What operation is performed by the statement `myFile.write('Hello')` in a Python example?
Απάντηση
(B)
Writing 'Hello' to the file
34
What does the term 'index' refer to within an array?
Απάντηση
(C)
The position of an element within the array
35
What does the `open()` function typically return when successful?
Απάντηση
(C)
A file object
36
What does `myFile.readline()` do in Python?
Απάντηση
(B)
Reads a line from the file
37
What is the function of the `Lowercase` method in string handling?
Απάντηση
(C)
To convert a string to lowercase.
38
In the provided code, what is the purpose of initializing `ClassHigh` to 0?
Απάντηση
(C)
To set the starting value for comparing with student marks.
39
What does a "For" loop usually require?
Απάντηση
(A)
A start value, an end value, and an increment/decrement.
40
What is the purpose of `Input` in the pseudo code?
Απάντηση
(B)
Takes the input from the user.
41
Which programming construct allows a program to repeat a block of code until a certain condition is met?
Απάντηση
(B)
Iteration statement
42
Which of the following is NOT a typical action when working with a file?
Απάντηση
(D)
Sorting
43
In a nested IF-ELSE structure, how are the inner blocks of code related to the outer structure?
Απάντηση
(B)
The execution of the inner block depends on the condition of the outer block.
44
Which of the following are good practices when working with files?
Απάντηση
A
C
45
What is the advantage of using meaningful identifiers for variables?
Απάντηση
(B)
Improves code readability and understanding.
46
Which type of loop is characterized by the condition being evaluated *after* the loop body executes?
Απάντηση
(B)
Post-condition loop
47
Which part of the program is executed based on the value of 'answer' in the case statement?
Απάντηση
(B)
The code block associated with the matching case.
48
What does the '%' operator represent in many programming languages?
Απάντηση
(C)
Modulo (remainder)
49
What is the primary benefit of the 'modular' approach to programming (using procedures and functions)?
Απάντηση
(D)
It enhances reusability and reduces code duplication.
50
Which is a characteristic of a post-condition loop?
