PHP Preparation Practice Exams Questions with Explanation: High Quality Practice Exams of PHP with Comprehensive Questions and Detailed Explanation by Scholars Practice Exams

Author:Scholars, Practice Exams
Language: eng
Format: epub
Published: 2024-10-29T00:00:00+00:00

CHAPTER 4 MCQ’s

Object-Oriented Programming (OOP)

Question 1. What is the primary purpose of using classes in Object-Oriented Programming in PHP, and how do they facilitate the concept of encapsulation by bundling data and behavior together?

A. To provide a blueprint for creating objects that encapsulate properties and methods.

B. To enable global variables to be used across different parts of a program.

C. To improve the performance of the script by reducing memory usage.

D. To allow for the direct manipulation of database connections.

Correct Answer: A

Explanation: Classes serve as templates for creating objects in OOP, allowing the encapsulation of both data (properties) and methods (functions) related to that data. This promotes better organization of code and enhances maintainability, as changes can be made within the class without affecting other parts of the application.

Question 2. In PHP, what is the significance of the __construct() method within a class, and how does it contribute to object instantiation by initializing object properties when an object is created?

A. It is used to perform cleanup tasks when an object is destroyed.

B. It initializes the object's properties and sets up the object at the time of instantiation.

C. It defines static properties that can be accessed without creating an object.

D. It is the method that handles errors thrown by the class.

Correct Answer: B

Explanation: The __construct() method in PHP is a special function called automatically when a new object of the class is created. It allows for the initialization of object properties with default or passed values, ensuring that the object is ready for use immediately after instantiation.

Question 3. What is inheritance in PHP OOP, and how does it enable a child class to inherit properties and methods from a parent class, allowing for code reuse and the creation of hierarchical relationships?

A. It allows classes to be instantiated without defining them.

B. It provides a way to define interfaces for implementing multiple class behaviors.

C. It enables a new class to take on the properties and methods of an existing class, promoting code reuse.

D. It creates a private method that can only be accessed by the class itself.

Correct Answer: C

Explanation: Inheritance is a fundamental OOP concept where a child class can inherit properties and methods from a parent class. This allows developers to reuse existing code, create a hierarchical structure of classes, and implement polymorphism, which facilitates flexibility and extensibility in code design.

Question 4. How does the final keyword affect class inheritance in PHP, specifically in preventing a class from being extended or a method from being overridden, and what implications does this have for design choices?

A. It allows methods to be inherited by all subclasses without restriction.

B. It prevents the class from being instantiated directly.

C. It prohibits further inheritance of a class or overriding of a method, ensuring its implementation remains unchanged.

D. It enables a class to implement multiple interfaces at once.

Correct Answer: C

Explanation: The final keyword in PHP can be applied to classes and methods to restrict inheritance. When a class is declared as final, it cannot be subclassed, and if a method is final, it cannot be overridden in any derived class.

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