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Object Oriented Concept MCQ question and answer with solution | PHP Programming

Learn Object Oriented Concept MCQ Questions and answers with easy and logical explanations. Object Oriented Concept MCQ in PHP programming provides all type of technical mcq questions which is important for technical exams, cumpus exams and other entrance examination Page-2 section-1

Each section contains 100 MCQs on Object Oriented Concept .
11
Inheritance is the means by which one or more classes can be derived from a/an ___ class.
Discuss
Answer & Solution
Answer: Option A
Solution:
A class that inherits from another is said to be a subclass of it. This relationship is often described in terms of parents and children. A child class is derived from and inherits characteristics from the parent.
12
What will be the output of the following PHP code? 
<?php
class MyClass
{
}
 
$a = new MyClass;
var_dump(!($a instanceof stdClass));
?>
Discuss
Answer & Solution
Answer: Option A
Solution:
To check if an object is not an instanceof a class, the logical not operator can be used.
13
What should be used to refer to a method in the context of a class rather than an object you use?
Discuss
Answer & Solution
Answer: Option D
Solution:
Example- parent::__construct()
14
Prior to which version of PHP did constructors took the name of the enclosing class.
Discuss
Answer & Solution
Answer: Option B
Solution:
The new unified constructors use the name __construct(). Using the old syntax, a call to a parent constructor would tie you to that particular class: parent::ShopProduct();
15
Which method or property can only be accessed from within the enclosing class? Even subclasses have no access.
Discuss
Answer & Solution
Answer: Option C
No explanation is given for this question. Let's Discuss on Board
16
A mutator method is also called as.
Discuss
Answer & Solution
Answer: Option A
Solution:
An accessor method is called getter. The common use of a mutator method is to initialise the value of member variables of a class.
17
Which version of PHP introduced the static keyword?
Discuss
Answer & Solution
Answer: Option B
Solution:
The static keyword was introduced with PHP 5. It cannot be used in PHP 4 scripts.
18
Which keyword is used to access a static method or property from within the same class(rather than from child)?
Discuss
Answer & Solution
Answer: Option C
Solution:
Self is to classes what the $this pseudo-variable is to objects.
19
In which of the following circumstance should you use a static reference to a non static method?
Discuss
Answer & Solution
Answer: Option A
Solution:
Making a method call using parent is the only circumstance in which you should use a static reference to a non-static method.
20
Which one of the following variable cannot be used inside a static method?
Discuss
Answer & Solution
Answer: Option A
Solution:
By definition, static methods are not invoked in the context of an object. For this reason, static methods and properties are often referred to as class variables and properties.