Computer Science for IGCSE & O level - Programming (Section 12)
1
What is the role of the 'return' statement in a function?
Trả lời
(C)
To end the function and return a value.
2
In the "Totaling" example, the value of TotalWeight is being increased by what?
Trả lời
(A)
Weight
3
What does the `'''` notation usually denote in Python?
Trả lời
(B)
A multi-line comment
4
What is a characteristic feature of a pre-condition loop?
Trả lời
(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'?
Trả lời
(B)
INTEGER
6
What is the value that needs to be provided for return to the user?
Trả lời
(C)
Return Value
7
What is the primary role of a debugger?
Trả lời
(C)
To find and fix errors in code.
8
What are potential benefits of using an IDE for programming?
Trả lời
A
B
C
9
If a program contains nested statements, what is the relation between the outer and inner statements?
Trả lời
(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?
Trả lời
(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
```
Trả lời
(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?
Trả lời
(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?
Trả lời
(B)
You are an adult
14
What is the main function of the 'Uppercase' string handling method?
Trả lời
(B)
To convert all the characters in a string to uppercase.
15
What is the role of parameters in a procedure or function?
Trả lời
(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?
Trả lời
(B)
When 'Finish' reaches 300.
17
In Java, what type of object is usually created when working with files for writing?
Trả lời
(C)
FileWriter
18
What is the meaning of `CALL` in the provided context?
Trả lời
(B)
To execute a function or procedure.
19
What is the main advantage of nesting selection statements?
Trả lời
(C)
It allows you to express complex conditions.
20
What is the function of the nested loop in this algorithm?
Trả lời
(D)
To calculate total of marks of students.
21
What happens when you open a file in append mode ('a')?
Trả lời
(D)
New content is added at the end of the file.
22
Which of these statements is not a part of a function definition?
Trả lời
(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?
Trả lời
(B)
Constants.
24
Which statement is correct regarding the selection statements in programming languages?
Trả lời
(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?
Trả lời
(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')`)?
Trả lời
(B)
Write mode
27
What does the outer loop iterate through in the given pseudo-code examples?
Trả lời
(C)
The number of students.
28
In the context of the 'Worked example,' what does the term 'average mark' refer to?
Trả lời
(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?
Trả lời
(B)
To keep track of the number of marks entered.
30
Based on the provided text, what is the main purpose of the algorithm?
Trả lời
(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?
Trả lời
(B)
The code inside the ELSE or default case (if present) is executed.
32
What is the main concept of a reusable code?
Trả lời
(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?
Trả lời
(C)
Nested statements
34
What type of loop is illustrated by the following code snippet?
```
REPEAT
Statement(s)
UNTIL condition
```
Trả lời
(C)
Post-condition loop
35
In Java, when are you required to import `java.io.File`?
Trả lời
(D)
All of the above
36
What is the primary purpose of the `Substring` method?
Trả lời
(B)
To extract a portion of a string.
37
In pseudocode, what is the main purpose of using 'OPENFILE'?
Trả lời
(C)
To establish a connection to the file
38
What is the first task mentioned in the 'Worked example'?
Trả lời
(C)
Calculate and output highest, lowest, and average marks for a class.
39
Which of these is NOT a common file operation discussed?
Trả lời
(D)
Deleting a file
40
Which of the following can be part of an arithmetic expression?
Trả lời
A
B
C
41
What does the NOT logical operator do?
Trả lời
(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?
Trả lời
(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"?
Trả lời
(B)
Highest and lowest marks for each student.
44
In the provided examples, which elements help in making the code modular?
Trả lời
(C)
Procedures and functions
45
What is the key characteristic of a local variable?
Trả lời
(C)
It is only accessible within the block in which it is defined.
46
What does a two-dimensional array store?
Trả lời
(B)
A table of values with rows and columns.
47
What is one of the uses of library routines?
Trả lời
(C)
To perform standard tasks.
48
What is generally considered the first step in interacting with a file in most programming languages?
Trả lời
(D)
Opening the file.
49
What does the algorithm output at the end?
Trả lời
(D)
All of the above.
50
In the context of programming, what does "iteration" refer to?
