15 extra multiple-choice questions for Functions and Arrays in PHP (12th Standard Computer Applications, Samacheer Kalvi), beyond the ones printed in the textbook — each with the correct option highlighted and a clear, worked explanation. Free to read in English and Tamil.
Q1
Which of the following is an advantage of using functions in PHP that allows programmers to test and debug individual blocks of code separately from the rest of the application?
- A. Modularity
- B. Testing and debuggingCorrect
- C. Code reuse
- D. Polymorphism
Explanation. In PHP, using functions facilitates easier testing and debugging because individual functions can be isolated and verified independently from the remainder of the application's source code.
Q2
How does PHP handle case-sensitivity regarding user-defined function names?
- A. User-defined function names are completely case-sensitive.
- B. Only the first letter of the function name is case-sensitive.
- C. User-defined function names are not case-sensitive.Correct
- D. Only functions containing numbers are case-sensitive.
Explanation. PHP does not treat user-defined function names as case-sensitive, meaning that calling a function with different letter casings will still execute the same function block.
Q3
A user-defined function name in PHP must start with which of the following characters?
- A. A dollar sign (\$) or a number
- B. A letter or an underscoreCorrect
- C. A number or a special symbol
- D. A semicolon (;) or an asterisk (*)
Explanation. According to the PHP language rules, a user-defined function name is required to begin with either an alphabetical letter or an underscore character.
Q4
In PHP terminology, what is the precise distinction between the terms "parameter" and "argument"?
- A. Arguments are used in the function definition, while parameters are used in the function call.
- B. Parameters are used in the function definition, while arguments are used in the function call.Correct
- C. Parameters must be strings, while arguments must be numeric values.
- D. Arguments are always optional, while parameters are always mandatory.
Explanation. In PHP programming, parameters refer to the variables declared in the function's definition header, whereas arguments represent the actual values passed to the function during its execution call.
Q5
How does PHP differ from traditional programming languages regarding the data types stored within a single array?
- A. Traditional languages allow any data types, whereas PHP restricts arrays to only one data type.
- B. PHP does not require all elements in an array to be of the same data type, unlike traditional languages.Correct
- C. PHP arrays can only store integer types, while traditional languages support mixed types.
- D. Both PHP and traditional languages strictly forbid mixed data types in arrays.
Explanation. PHP arrays are flexible and can contain elements of diverse data types simultaneously, whereas traditional programming languages generally require all elements in an array to be of the same type.
Q6
Which of the following is another term used to describe the keys in a PHP associative array?
- A. Indexes
- B. Parameters
- C. LabelsCorrect
- D. Nodes
Explanation. The keys in a PHP associative array are commonly referred to as labels because they serve to identify and label the corresponding values stored within the data structure.
Q7
When declaring a PHP array name, which symbol must it begin with, followed by a letter or an underscore?
- A. #
- B. &
- C. \$Correct
- D. _
Explanation. Array names in PHP are variables, and therefore they must always begin with the dollar sign symbol, followed by a letter or an underscore character.
Q8
Which operator is used to separate keys from their corresponding values when defining an associative array in PHP?
- A. ->
- B. =>Correct
- C. =
- D. ::
Explanation. PHP utilizes the double-arrow operator to link keys with their designated values when creating associative arrays in code blocks.
Q9
In a PHP multidimensional array, what do the first and second sets of square brackets specify respectively?
- A. Column and Row
- B. Key and Value
- C. Row and ColumnCorrect
- D. Index and Label
Explanation. Accessing nested elements in a multidimensional array requires two sets of square brackets, where the first set designates the row index and the second set designates the column index.
Q10
Which of the following is another name for a PHP multidimensional array?
- A. Indexed array
- B. Nested arrayCorrect
- C. Linear array
- D. Flat array
Explanation. Multidimensional arrays in PHP are also referred to as nested arrays because they are constructed as arrays containing one or more other arrays as their elements.
Q11
Consider the PHP array: \$student = array("name" => "Barath", "age" => 23);. What will be the output of echo \$student["age"];?
- A. name
- B. Barath
- C. age
- D. 23Correct
Explanation. The associative array uses keys as labels. Accessing the array with the key "age" retrieves and outputs its associated integer value, which is 23.
Q12
Which of the following is a correct syntax to create an indexed array containing elements in PHP?
- A. \$colors = { "red", "green", "blue" };
- B. \$colors = array("red", "green", "blue");Correct
- C. \$colors = ( "red", "green", "blue" );
- D. \$colors = "red" . "green" . "blue";
Explanation. PHP allows creating indexed arrays by passing a comma-separated list of values into the built-in array function or enclosing them within square brackets.
Q13
What is the key keyword used in PHP to initiate the declaration of a user-defined function?
- A. def
- B. funct
- C. functionCorrect
- D. define
Explanation. To define a custom function in PHP, the programmer must use the lowercase keyword "function" followed by the function's name and parenthesis.
Q14
Which of the following describes the modularity advantage of using functions in PHP?
- A. It allows code to be executed faster on the browser side.
- B. It breaks down the code into smaller, manageable pieces that are easier to maintain.Correct
- C. It encrypts the database connection string automatically.
- D. It converts PHP code directly into native machine code.
Explanation. Modularity refers to dividing a large program into smaller, self-contained functional modules, making the overall codebase significantly easier to organize, read, and maintain.
Q15
Consider the PHP nested array: \(arr = array(array(1, 2, 3), array(4, 5, 6), array(7, 8, 9));. What is the value of \)arr?
- A. 2
- B. 5
- C. 6Correct
- D. 8
Explanation. The index 1 refers to the second sub-array (which is array(4, 5, 6)), and index 2 refers to the third element inside that sub-array, which has a value of 6.
