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Computer Science for IGCSE & O level - Programming (Section 3)

1
What is meant by the term 'scope' in the context of programming variables?
Answer
(B)
The part of the code where a variable is visible and can be used.
2
What is the purpose of the `//` operator in Python?
Answer
(C)
Floor division (integer division)
3
What is the result of the following code: `print 10 != 5`
Answer
(A)
True
4
Which component of the computer is responsible for processing the data?
Answer
(B)
CPU
5
What do the operators AND, OR, and NOT primarily manipulate?
Answer
(C)
Boolean values
6
Which programming language uses a .java file extension?
Answer
(B)
Java
7
Which control structure is used to execute a block of code multiple times?
Answer
(C)
Loop
8
What does the term 'concatenation' mean in the context of string handling?
Answer
(B)
Combining two or more strings together.
9
Which of the following is a common type of loop used in programming?
Answer
(B)
FOR
10
What is the role of the "CPU" in a computer system?
Answer
(B)
To execute instructions and perform calculations.
11
What is the role of the `DIV` function?
Answer
(B)
To divide two numbers and return the whole number portion of the result.
12
In which programming environment would you write your code to be able to execute?
Answer
(A)
IDE
13
What does the term 'variable declaration' mean?
Answer
(C)
Creating a variable and specifying its type.
14
Which statement most accurately describes the difference between a procedure and a function?
Answer
(A)
Procedures can't return values; functions always return values.
15
In a Java program, where does the program start executing?
Answer
(B)
In the main method
16
What is the main difference between a local and a global variable?
Answer
(C)
Local variables are declared inside a function, and global variables are declared outside any function.
17
When designing an algorithm, what should you consider first?
Answer
(B)
The desired output and the steps needed to achieve it.
18
Which of the following is a characteristic of a good algorithm?
Answer
(B)
It should be efficient and produce the correct output.
19
What is the output of `print(10 // 3)`?
Answer
(B)
3
20
Which of the following are considered string handling methods?
Answer
A
B
21
What is the primary advantage of using nested loops in programming?
Answer
(B)
To repeat a set of instructions multiple times for different levels of iteration.
22
In file handling, what is the purpose of closing a file?
Answer
(C)
To release system resources.
23
Which of these is an example of a valid variable assignment in Python?
Answer
(B)
name = "John"
24
What is a benefit of using a high-level programming language over a low-level programming language?
Answer
(C)
Easier to write and understand.
25
What data type would be used to store the value 'True' or 'False'?
Answer
(C)
Boolean
26
What is the main purpose of comments in programming?
Answer
(B)
To provide explanations about the code.
27
How can you make your program easier to modify and update (more maintainable)?
Answer
(B)
By using meaningful variable names and comments.
28
In a program dealing with student data, what is the likely purpose of a constant declared as `MAX_SUBJECTS`?
Answer
(B)
To define the maximum number of subjects a student can take.
29
Why is modular programming beneficial?
Answer
(C)
It helps with code reuse and makes code easier to manage.
30
In the example given (total and counting), what data structure is being used?
Answer
(B)
Variables
31
What is the purpose of the `FOR` loop in the context of student and subject marks?
Answer
(C)
To iterate through a specified number of subjects or students.
32
What is an 'operand' in a programming context?
Answer
(B)
A variable or value that an operator acts upon.
33
Which data type is used to represent text in programming?
Answer
(C)
String
34
In a one-dimensional array, what typically represents the first element's index in most programming languages?
Answer
(C)
0
35
Which data type is most suitable for storing the number of hours worked?
Answer
(D)
INTEGER
36
Which programming concept is used to repeatedly execute a block of code?
Answer
(C)
Iteration
37
If you want to find the largest value in a set of numbers, what programming construct would you use?
Answer
(A)
A loop combined with a conditional statement.
38
What distinguishes local variables from global variables?
Answer
(C)
Local variables are only accessible within the block (e.g., function) where they are declared; global variables can be accessed throughout the program.
39
What is the purpose of the `OR` operator in a conditional statement?
Answer
(B)
To execute code if at least one condition is true.
40
What does a conditional statement (e.g., `IF-THEN-ELSE`) primarily do?
Answer
(C)
Execute code based on a specific condition.
41
What does DRY stand for in programming principles?
Answer
(A)
Don't Repeat Yourself
42
What is the role of the `break` statement inside a loop?
Answer
(B)
To stop the execution of the loop.
43
What does the `OUTPUT` statement typically require?
Answer
(B)
A variable or expression to display.
44
If you wanted to convert the string "hello" to uppercase, what string handling method would you use?
Answer
(C)
ToUpper()
45
When declaring an array, what determines the maximum number of elements it can hold?
Answer
(C)
The specified size or bounds of the array
46
Which data type is the most suitable for storing someone's age?
Answer
(D)
INTEGER
47
In which programming language can you find the `CASE` statement?
Answer
(D)
All languages that support Selection
48
Which structure is used to execute a piece of code repeatedly?
Answer
(C)
A loop.
49
What is the first line in Python code output?
Answer
(C)
print ('Hello World')
50
Which data type would you use to represent a true or false value in programming?
Answer
(C)
Boolean