Chapter:

60+ OOP Solved MCQs

in Advance PHP

Chapters

18

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1.	--------is about writing procedures or functions that perform operations on the data. Sol:
A.	procedural programming
B.	function programming
C.	object oriented programming
D.	class
Answer» A. procedural programming

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2.	while--------is about creating objects that contain both data and functions. Sol:
A.	procedural programming
B.	function programming
C.	object oriented programming
D.	method
Answer» C. object oriented programming

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3.	A class is defined by using the---keyword, followed by the name of the class and a pair of curly braces ({}). All its properties and methods go inside the braces Sol:
A.	procedural programming
B.	function programming
C.	object oriented programming
D.	class
Answer» D. class

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4.	----are nothing without objects! We can create multiple objects from a class Sol:
A.	procedural programming
B.	function programming
C.	object oriented programming
D.	class
Answer» D. class

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5.	Each----has all the properties and methods defined in the class, but they will have different property values.
A.	object
B.	$this
C.	instanceof
D.	class
Answer» A. object

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6.	-----of a class is created using the new keyword Sol:
A.	object
B.	$this
C.	instanceof
D.	class
Answer» A. object

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7.	The-----keyword refers to the current object, and is only available inside methods Sol:
A.	object
B.	$this
C.	instanceof
D.	class
Answer» B. $this

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8.	Objects of a class is created using the-----keyword Sol:
A.	new
B.	$this
C.	instanceof
D.	class
Answer» A. new

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9.	we change the value of the $name property? There are two ways: Inside the ----- &Outside the class
A.	object
B.	$this
C.	instanceof
D.	class
Answer» D. class

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10.	You can use the----keyword to check if an object belongs to a specific class Sol:
A.	object
B.	$this
C.	instanceof
D.	class
Answer» C. instanceof

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11.	A-----allows you to initialize an object's properties upon creation of the object Sol:
A.	constructor
B.	in
C.	instanceof
D.	class
Answer» A. constructor

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12.	If you create a-----function, PHP will automatically call this function when you create an object from a class.
A.	__Construct()
B.	___Destruct()
C.	oop
D.	class
Answer» A. __Construct()

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13.	that the construct function starts with two underscores------- Sol:
A.	__ ()
B.	___ ()
C.	oop
D.	class
Answer» A. __ ()

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14.	A------ is called when the object is destructed or the script is stopped or exited. Sol:
A.	constructor
B.	destructor
C.	oop
D.	class
Answer» B. destructor

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15.	If you create a-----function, PHP will automatically call this function at the end of the script
A.	__Construct()
B.	___Destruct()
C.	oop
D.	class
Answer» B. ___Destruct()

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16.	Notice that the destruct function starts with------- Sol:
A.	__Construct()
B.	___()
C.	oop
D.	class
Answer» B. ___()

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17.	-----function that is automatically called when you create an object from a class, and a ---------function that is automatically called at the end of the script
A.	__Construct() & __destruct()
B.	___Destruct()& input()
C.	oop& procedure
D.	class & object
Answer» A. __Construct() & __destruct()

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18.	------stands for Object-Oriented Programming. Sol:
A.	__Construct()
B.	___Destruct()
C.	OOP
D.	class
Answer» C. OOP

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19.	-----and methods can have access modifiers which control where they can be accessed Sol:
A.	Properties
B.	Destruct
C.	OOP
D.	class
Answer» A. Properties

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20.	-----the property or method can be accessed from everywhere. This is default Sol:
A.	Properties
B.	public
C.	protected
D.	private
Answer» B. public

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21.	------the property or method can be accessed within the class and by classes derived from that class .
A.	Properties
B.	public
C.	protected
D.	private
Answer» C. protected

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22.	------the property or method can ONLY be accessed within the class Sol:
A.	Properties
B.	public
C.	protected
D.	private
Answer» D. private

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23.	--------in OOP When a class derives from another class. Sol:
A.	inheritance
B.	public
C.	protected
D.	private
Answer» A. inheritance

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24.	The-----will inherit all the public and protected properties and methods from the parent class. In addition, it can have its own properties and methods.
A.	inheritance
B.	child class
C.	protected
D.	private
Answer» B. child class

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25.	An inherited class is defined by using the------keyword Sol:
A.	inheritance
B.	public
C.	extends
D.	private
Answer» C. extends

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26.	---methods can be overridden by redefining the methods (use the same name) in the child class.
A.	inheritance
B.	public
C.	protected
D.	private
Answer» A. inheritance

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27.	The----keyword can be used to prevent class inheritance or to prevent method overriding
A.	final
B.	constants
C.	const
D.	case-sensitive
Answer» A. final

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28.	------cannot be changed once it is declared. Sol:
A.	final
B.	constants
C.	const
D.	case-sensitive
Answer» B. constants

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29.	Class constants can be useful if you need to define some-------data within a class Sol:
A.	final
B.	constants
C.	const
D.	case-sensitive
Answer» B. constants

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30.	A class constant is declared inside a class with the-----keyword. Sol:
A.	final
B.	constants
C.	const
D.	case-sensitive
Answer» C. const

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31.	Class constants are--------However, it is recommended to name the constants in all uppercase letters.
A.	final
B.	constants
C.	const
D.	case-sensitive
Answer» D. case-sensitive

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32.	We can access a-------from outside the class by using the class name followed by the scope resolution operator (::) followed by the constant name
A.	final
B.	constant
C.	const
D.	case-sensitive
Answer» B. constant

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33.	-------classes and methods are when the parent class has a named method, but need its child class(es) to fill out the tasks
A.	abstract
B.	child
C.	interface
D.	implement
Answer» A. abstract

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34.	An------class is a class that contains at least one abstract method Sol:
A.	abstract
B.	child
C.	interface
D.	implement
Answer» A. abstract

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35.	An------method is a method that is declared, but not implemented in the code. Sol:
A.	abstract
B.	child
C.	interface
D.	implement
Answer» A. abstract

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36.	An abstract class or method is defined with the------keyword: Sol:
A.	abstract
B.	child
C.	interface
D.	implement
Answer» A. abstract

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37.	When inheriting from an------class, the child class method must be defined with the same name
A.	abstract
B.	child
C.	interface
D.	implement
Answer» A. abstract

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38.	if the-----method is defined as protected, the child class method must be defined as either protected or public, but not private
A.	abstract
B.	child
C.	interface
D.	implement
Answer» A. abstract

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39.	The----class method must be defined with the same name and it re declares the parent abstract method Sol:
A.	abstract
B.	child
C.	interface
D.	implement
Answer» B. child

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40.	The-----class method must be defined with the same or a less restricted access modifier Sol:
A.	abstract
B.	child
C.	interface
D.	implement
Answer» B. child

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41.	The number of required arguments must be the same. However, the-----class may have optional arguments in addition
A.	abstract
B.	child
C.	interface
D.	implement
Answer» B. child

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42.	-----make it easy to use a variety of different classes in the same way. When one or more classes use the same interface, it is referred to as "polymorphism"
A.	abstract
B.	child
C.	interface
D.	implement
Answer» C. interface

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43.	Interfaces are declared with the------keyword. Sol:
A.	abstract
B.	child
C.	interface
D.	implement
Answer» C. interface

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44.	------cannot have properties, while abstract classes can Sol:
A.	abstract
B.	child
C.	interface
D.	implement
Answer» C. interface

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45.	All------methods must be public, while abstract class methods is public or protected Sol:
A.	abstract
B.	child
C.	interface
D.	implement
Answer» C. interface

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46.	All methods in an-----are abstract, so they cannot be implemented in code and the abstract keyword is not necessary
A.	abstract
B.	child
C.	interface
D.	implement
Answer» A. abstract

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47.	-------keyword is used in interface Sol:
A.	abstract
B.	child
C.	interface
D.	implement
Answer» D. implement

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48.	To implement an interface, a class must use the-------keyword. Sol:
A.	abstract
B.	child
C.	interface
D.	implement
Answer» D. implement

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49.	A class that implements an interface must------all of the interface's methods. Sol:
A.	abstract
B.	child
C.	interface
D.	implement
Answer» D. implement

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50.	PHP only supports---------a child class can inherit only from one single parent.
A.	abstract
B.	child
C.	interface
D.	single inheritance
Answer» D. single inheritance

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51.	class needs to inherit multiple behaviors? OOP------is used to solve this problem. Sol:
A.	static
B.	self
C.	traits
D.	single inheritance
Answer» C. traits

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52.	------are used to declare methods that can be used in multiple classes. Traits can have methods and abstract methods that can be used in multiple classes.
A.	static
B.	self
C.	traits
D.	single inheritance
Answer» C. traits

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53.	Traits are declared with the----keyword Sol:
A.	static
B.	self
C.	traits
D.	single inheritance
Answer» C. traits

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54.	------methods can be called directly - without creating an instance of the class first. Sol:
A.	static
B.	self
C.	traits
D.	single inheritance
Answer» A. static

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55.	Static methods are declared with the------keyword Sol:
A.	static
B.	self
C.	traits
D.	single inheritance
Answer» A. static

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56.	A class can have both static and non-static methods. A static method can be accessed from a method in the same class using the-----keyword and double colon (::)
A.	static
B.	self
C.	traits
D.	single inheritance
Answer» B. self

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57.	------properties can be called directly - without creating an instance of a class. Sol:
A.	static
B.	self
C.	traits
D.	single inheritance
Answer» A. static

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58.	An iterable is any value which can be looped through with a-----loop. Sol:
A.	foeach()
B.	self
C.	traits
D.	single inheritance
Answer» A. foeach()

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59.	The-----pseudo-type was introduced in PHP 7.1, and it can be used as a data type for function arguments and function return values.
A.	foeach()
B.	self
C.	iterable
D.	single inheritance
Answer» C. iterable

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60.	The-----keyword can be used as a data type of a function argument or as the return type of a function:
A.	foeach()
B.	self
C.	iterable
D.	single inheritance
Answer» C. iterable

discuss

60+ OOP Solved MCQs

--------is about writing procedures or functions that perform operations on the data. Sol:

while--------is about creating objects that contain both data and functions. Sol:

A class is defined by using the---keyword, followed by the name of the class and a pair of curly braces ({}). All its properties and methods go inside the braces Sol:

----are nothing without objects! We can create multiple objects from a class Sol:

Each----has all the properties and methods defined in the class, but they will have different property values.

-----of a class is created using the new keyword Sol:

The-----keyword refers to the current object, and is only available inside methods Sol:

Objects of a class is created using the-----keyword Sol:

we change the value of the $name property? There are two ways: Inside the ----- &Outside the class

You can use the----keyword to check if an object belongs to a specific class Sol:

A-----allows you to initialize an object's properties upon creation of the object Sol:

If you create a-----function, PHP will automatically call this function when you create an object from a class.

that the construct function starts with two underscores------- Sol:

A------ is called when the object is destructed or the script is stopped or exited. Sol:

If you create a-----function, PHP will automatically call this function at the end of the script

Notice that the destruct function starts with------- Sol:

-----function that is automatically called when you create an object from a class, and a ---------function that is automatically called at the end of the script

------stands for Object-Oriented Programming. Sol:

-----and methods can have access modifiers which control where they can be accessed Sol:

-----the property or method can be accessed from everywhere. This is default Sol:

------the property or method can be accessed within the class and by classes derived from that class .

------the property or method can ONLY be accessed within the class Sol:

--------in OOP When a class derives from another class. Sol:

The-----will inherit all the public and protected properties and methods from the parent class. In addition, it can have its own properties and methods.

An inherited class is defined by using the------keyword Sol:

---methods can be overridden by redefining the methods (use the same name) in the child class.

The----keyword can be used to prevent class inheritance or to prevent method overriding

------cannot be changed once it is declared. Sol:

Class constants can be useful if you need to define some-------data within a class Sol:

A class constant is declared inside a class with the-----keyword. Sol:

Class constants are--------However, it is recommended to name the constants in all uppercase letters.

We can access a-------from outside the class by using the class name followed by the scope resolution operator (::) followed by the constant name

-------classes and methods are when the parent class has a named method, but need its child class(es) to fill out the tasks

An------class is a class that contains at least one abstract method Sol:

An------method is a method that is declared, but not implemented in the code. Sol:

An abstract class or method is defined with the------keyword: Sol:

When inheriting from an------class, the child class method must be defined with the same name

if the-----method is defined as protected, the child class method must be defined as either protected or public, but not private

The----class method must be defined with the same name and it re declares the parent abstract method Sol:

The-----class method must be defined with the same or a less restricted access modifier Sol:

The number of required arguments must be the same. However, the-----class may have optional arguments in addition

-----make it easy to use a variety of different classes in the same way. When one or more classes use the same interface, it is referred to as "polymorphism"

Interfaces are declared with the------keyword. Sol:

------cannot have properties, while abstract classes can Sol:

All------methods must be public, while abstract class methods is public or protected Sol:

All methods in an-----are abstract, so they cannot be implemented in code and the abstract keyword is not necessary

-------keyword is used in interface Sol:

To implement an interface, a class must use the-------keyword. Sol:

A class that implements an interface must------all of the interface's methods. Sol:

PHP only supports---------a child class can inherit only from one single parent.

class needs to inherit multiple behaviors? OOP------is used to solve this problem. Sol:

------are used to declare methods that can be used in multiple classes. Traits can have methods and abstract methods that can be used in multiple classes.

Traits are declared with the----keyword Sol:

------methods can be called directly - without creating an instance of the class first. Sol:

Static methods are declared with the------keyword Sol:

A class can have both static and non-static methods. A static method can be accessed from a method in the same class using the-----keyword and double colon (::)

------properties can be called directly - without creating an instance of a class. Sol:

An iterable is any value which can be looped through with a-----loop. Sol:

The-----pseudo-type was introduced in PHP 7.1, and it can be used as a data type for function arguments and function return values.

The-----keyword can be used as a data type of a function argument or as the return type of a function:

A class is defined by using the---keyword, followed by the name of the class and a pair
of curly braces ({}). All its properties and methods go inside the braces
Sol:

The----class method must be defined with the same name and it re declares the parent
abstract method
Sol: