PHP

Object Oriented Concept of PHP

⛪ Programming Language > PHP

This is the MCQ questions and answers section on "Object Oriented PHP" with the explanation for various interview, competitive examination and entrance test. Solved examples with detailed answer description, explanation are given and it would be easy to understand. ➲ Object Oriented Concept of PHP - Quiz

Q 1: Which version of PHP introduced the instanceof keyword?

  • A PHP 4
  • B PHP 5
  • C PHP 5.3
  • D PHP 6

Q 2: Which one of the following functions is used to determine whether a class exists?

  • A exist()
  • B exist_class()
  • C class_exist()
  • D __exist()

Q 3: Which method scope prevents a method from being overridden by a subclass?

  • A Abstract
  • B Protected
  • C Final
  • D Static

Q 4: Which of the following statements is/are true about Constructors in PHP?
(i) PHP 4 introduced class constructors.
(ii) Constructors can accept parameters.
(iii) Constructors can call class methods or other functions
(iv) Class constructors can call on other constructors.

  • A (ii) and (iii)
  • B (ii), (iii) and (iv)
  • C None of the mentioned
  • D All of the mentioned

Q 5: PHP recognizes constructors by the name.

  • A classname()
  • B _construct()
  • C function _construct()
  • D function __construct()

Q 6: Which keyword allows class members (methods and properties) to be used without needing to instantiate a new instance of the class?

  • A protected
  • B final
  • C static
  • D private

Q 7: Which keyword is used to refer to properties or methods within the class itself?

  • A private
  • B public
  • C protected
  • D $this

Q 8: In the PHP code given below, what is/are the properties? 
< ?php 
    class Example 
    {
        public $name;
        function Sample()
        {
            echo "This is an example";
        }
    } 
?>

  • A echo
  • B public $name;
  • C class Example
  • D function sample()

Q 9: Which one of the following keyword is used to inherit our subclass into a superclass?

  • A extends
  • B implements
  • C inherit
  • D include

Q 10: Which one of the following functions is used to determine object type?

  • A obj_type()
  • B type()
  • C is_a()
  • D is_obj()

Q 11: The practice of separating the user from the true inner workings of an application through well-known interfaces is known as..

  • A Polymorphism
  • B Inheritance
  • C Encapsulation
  • D Abstraction

Q 12: hich of the following term originates from the Greek language that means

  • A Abstraction
  • B Polymorphism
  • C Inheritance
  • D Differential

Q 13: The practice of creating objects based on predefined classes is often referred to as..

  • A class creation
  • B object creation
  • C object instantiation
  • D class instantiation

Q 14: Which one of the following property scopes is not supported by PHP?

  • A friendly
  • B final
  • C public
  • D static

Q 15: Which one of the following can be used to instantiate an object in PHP assuming class name to be Foo?

  • A $obj = new $foo;
  • B $obj = new foo;
  • C $obj = new foo ();
  • D obj = new foo ();

Q 16: Which of the following method scopes is/are not supported by PHP?
(i) private
(ii) final
(iii) static
(iv) abstract

  • A Only (ii)
  • B Only (iv)
  • C (ii) and (iv)

Q 17: Which of the following is/are the right way to declare a method?
(i) function functionName() { function body }
(ii) scope function functionName() { function body }
(iii) method methodName() { method body }
(iv) scope method methodName() { method body }

  • A Only (ii)
  • B Only (iv)
  • C (i) and (ii)
  • D (iii) and (iv)

Q 18: Which one of the following is the right way to invoke a method?

  • A $object->methodName();
  • B object->methodName();
  • C object::methodName();
  • D $object::methodName();

Q 19: Which one of the following is the right way to call a class constant, given that the class is mathFunction?

  • A echo PI;
  • B echo mathFunction->PI;
  • C echo mathFunction::PI;
  • D echo mathFunction=PI;

Q 20: Which one of the following is the right way to define a constant?

  • A constant PI =
  • B const $PI =
  • C constant PI =
  • D const PI =

Q 21: Which of the following advanced OOP features is/are not supported by PHP?
(i) Method overloading
(ii) Multiple Inheritance
(iii) Namespaces
(iv) Object Cloning

  • A All of the mentioned
  • B All of the mentioned
  • C (i) and (ii)
  • D (iii) and (iv)

Q 22: Which of the following advanced OOP features is/are not supported by PHP?
(i) Method overloading
(ii) Multiple Inheritance
(iii) Namespaces
(iv) Object Cloning

  • A All of the mentioned
  • B All of the mentioned
  • C (i) and (ii)
  • D (iii) and (iv)

Q 23: Which version of PHP introduced the advanced concepts of OOP?

  • A PHP 4
  • B PHP 5
  • C PHP 5.3
  • D PHP 6

Q 24: Which one of the following is the right way to clone an object?

  • A _clone(targetObject);
  • B destinationObject = clone targetObject;
  • C destinationObject = _clone(targetObject);
  • D destinationObject = clone(targetObject);

Q 25: The class from which the child class inherits is called.
(i) Child class
(ii) Parent class
(iii) Super class
(iv) Base class

  • A Only (i)
  • B (ii), (iii) and (iv)
  • C Only (iii)
  • D (ii) and (iv)

Q 26: Which of the following is/are true for an abstract class?
(i) A class is declared abstract by prefacing the definition with the word abstract.
(ii) A class is declare abstract by using the keyword implements.
(iii) It is a class that really isn’t supposed to ever be instantiated but instead serves as a base class.
(iv) Attempting to instantiate an abstract class results in an error.

  • A Only (ii)
  • B All of the mentioned
  • C (ii) and (iv)

Q 27: If one intends to create a model that will be assumed by a number of closely related objects, which class must be used?

  • A Normal class
  • B Static class
  • C Abstract class
  • D Interface

Q 28: If your object must inherit behavior from a number of sources you must use a/an

  • A Interface
  • B Object
  • C abstract class
  • D static class

Q 29: Which method is used to tweak an object

  • A clone()
  • B __clone()
  • C _clone
  • D object_clone()

Q 30: Which feature allows us to call more than one method or function of the class in single instruction?

  • A Typecasting
  • B Method Including
  • C Method adding
  • D Method chaining

Q 31: Which magic method is used to implement overloading in PHP?

  • A __call
  • B __invoke
  • C __wakeup
  • D __unset