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Computer Science for IGCSE & O level - Programming (Section 10)

1
What is the primary function of a selection statement (like IF...THEN...ELSE)?
Answer
(C)
To choose which code block to execute based on a condition.
2
What is the main advantage of using a CASE statement over a series of IF-ELSE statements?
Answer
(B)
CASE statements are more readable when dealing with multiple conditions.
3
What is an advantage of using functions in a program?
Answer
(B)
They allow code reusability.
4
Which of the following is NOT a common characteristic of an IDE?
Answer
(D)
A web browser
5
What is the exponentiation operator in most programming languages (as per the examples)?
Answer
(C)
^
6
In the context of the table of counting operations, what is the purpose of the statement: `NumberOfSacks = NumberOfSacks + 1`?
Answer
(C)
To increase the count of sacks by one.
7
What will be the output for the following pseudocode? `Total = 10 Total = Total + 5 Output Total`
Answer
(C)
15
8
Which type of data would be used to store decimal values?
Answer
(B)
REAL
9
What does the `FOR` loop facilitate in the pseudo-code examples?
Answer
(B)
Iterates through a set of students.
10
What is a key benefit of writing modular code (using procedures and functions)?
Answer
(D)
It reduces code duplication and improves reusability.
11
What is meant by a 'maintainable' program?
Answer
(B)
A program that is easily understood, modified, and updated.
12
What is the key characteristic of a post-condition loop?
Answer
(B)
The loop body is guaranteed to execute at least once.
13
What is a key benefit of using nested selection statements?
Answer
(B)
It enables the implementation of more complex logic.
14
Which string method is used to find the number of characters in a string?
Answer
(B)
Length
15
What is a compiler's main task?
Answer
(B)
To translate source code into machine code.
16
Which of the following is used to store multiple data items in an array?
Answer
(D)
Elements with the same data type
17
Within a FOR loop, what dictates the number of times the code inside the loop will execute?
Answer
(B)
The condition specified by the start value, end value, and step.
18
What is the primary purpose of file handling in programming?
Answer
(B)
To store data permanently.
19
In the provided pseudo-code, which construct is used to repeat a block of code a specific number of times?
Answer
(C)
FOR loop
20
What is the term that is often used to define a code block?
Answer
(C)
Function
21
What does the concept of "sequence" represent in programming?
Answer
(A)
The order of steps in an algorithm
22
Which of the following is used to denote 'greater than or equal to' in many programming languages?
Answer
(C)
>=
23
In what kind of loop is the condition checked *before* any of the loop's code is executed?
Answer
(B)
Pre-condition loop
24
Which string handling method is used to convert a string to lowercase?
Answer
(C)
Lowercase
25
In a program, what is an example of an output statement?
Answer
(B)
print("Hello")
26
In a `FOR` loop, what is usually defined at the start?
Answer
(C)
The initial value of a counter.
27
What does `myFile.close()` do in the Python example?
Answer
(C)
Closes the file
28
In the `Worked Example`, which part of the code would be executed repeatedly for each student?
Answer
A
C
29
Which method is typically used to change all characters in a string to lowercase?
Answer
(C)
Lowercase
30
If we have two conditions, A and B, which logical operator returns TRUE only when *both* A and B are TRUE?
Answer
(B)
AND
31
What is the purpose of the Step value in a FOR loop, such as `For number = 10 to 50 Step 5`?
Answer
(C)
To determine the increment or decrement for each iteration.
32
When you open a file in 'r+' mode (read and write), what happens?
Answer
(B)
The file is opened for reading and writing, starting from the beginning.
33
What would typically be required when defining a function?
Answer
A
B
C
34
Which of the following is a characteristic of a variable in a computer program?
Answer
(B)
Its value can change during the execution of the program.
35
What is the role of comments in programming code?
Answer
(B)
To provide information and explanations for human readers.
36
In the pseudocode, what is the primary purpose of the line: `TOTAL = 0`?
Answer
(C)
To initialize the 'TOTAL' variable to zero.
37
What does the keyword `DECLARE` signify in the given code examples?
Answer
(A)
A variable is being defined.
38
What is the range of valid index values in an array in most programming languages?
Answer
(C)
From 0 to the number of elements in the array - 1.
39
What is the purpose of a 'FOR' loop when populating arrays?
Answer
(C)
To iterate through the elements of the array and assign values.
40
In the context of programming, what does "TotalWeight = TotalWeight + Weight" represent?
Answer
(B)
Adding the current value of TotalWeight and the value of Weight and assigning the result to TotalWeight.
41
What is the function of the 'Substring' method?
Answer
(B)
To extract part of a string.
42
What statement in pseudocode can be used to get input from the user?
Answer
(C)
INPUT
43
What is the primary function of the `RETURN` statement inside of a function?
Answer
(B)
To specify the value to be returned.
44
What is the usual behavior of a CASE statement if there's no matching case and no ELSE (or default) clause?
Answer
(C)
The program continues with the next statement after the CASE block.
45
Which operation is performed by the following in the given example: `Calculate Number1 + Number2 + Number3 + Number4 + Number5;`?
Answer
(C)
Addition
46
What is the primary purpose of the programming language that the school has chosen to use?
Answer
(D)
To create an algorithm.
47
In most programming languages, what typically signifies the end of a multi-line comment?
Answer
(B)
*/
48
What is the primary function of the 'try' and 'catch' blocks?
Answer
(B)
To handle potential errors (exceptions) in a program.
49
If a variable is declared inside a function, what scope does it have?
Answer
(B)
Local scope
50
What does the "Step 5" part of the `For` loop control in the given example: `For number to 10 to 50 Step 5`?
Answer
(C)
The increment value for each iteration.