Object-Oriented Programming Quizzes for Sixth Form College Students

Question 1

What is a key advantage of polymorphism in object-oriented programming?

Accepted Answer

Increased code reusability

Answer

Reduced memory usage

Answer

Improved code readability

Answer

Enhanced program speed

Question 2

Which of the following is **not** an advantage of using object-oriented programming (OOP) over traditional procedural programming?

Accepted Answer

Increased execution speed

Answer

Improved code organization and readability

Answer

Increased flexibility and extensibility

Answer

Reduced likelihood of errors

Question 3

Which of the following is a **disadvantage** of using inheritance in object-oriented programming?

Accepted Answer

Increased complexity and maintenance overhead

Answer

Reusability of code

Answer

Reduced coupling between classes

Answer

Improved performance

Question 4

In object-oriented programming, what concept involves organizing related data and behaviors into reusable units called objects?

Accepted Answer

Encapsulation

Answer

Inheritance

Answer

Abstraction

Answer

Polymorphism

Question 5

Which of the following is a characteristic of procedural programming, but not object-oriented programming?

Accepted Answer

Focus on procedural flow

Answer

Encapsulation

Answer

Modularity

Answer

Data independence

Question 6

In Java, the 'protected' access modifier grants visibility to which of the following?

Accepted Answer

Within the package and to subclasses, regardless of their package

Answer

Only within the class where it is declared

Answer

To all classes within the same hierarchy, including subclasses and superclasses

Answer

To any class that has a reference to an object of the class with the 'protected' modifier

Question 7

In object-oriented programming, which technique allows controlled access to private data members within an object?

Accepted Answer

Accessor (getter) methods

Accepted Answer

Mutator (setter) methods

Answer

Direct access to private data members

Answer

Protected access modifiers

Question 8

Which of the following is a disadvantage of object-oriented programming?

Accepted Answer

Inherent complexity

Answer

Increased code reusability

Answer

Improved maintainability and extensibility

Answer

Reduced coupling between different parts of the code

Question 9

Which of the following is NOT a fundamental principle of object-oriented programming (OOP)?

Accepted Answer

Sequential execution

Answer

Encapsulation

Answer

Polymorphism

Answer

Inheritance

Question 10

Which of the following is a potential drawback of encapsulation in object-oriented programming?

Accepted Answer

Increased code complexity and performance overhead

Answer

Enhanced data security and access control

Answer

Improved code maintainability and reusability

Answer

Enhanced flexibility and adaptability to changing requirements

Question 11

Which concept is NOT a fundamental principle of object-oriented programming?

Accepted Answer

Modularity

Answer

Encapsulation

Answer

Inheritance

Answer

Polymorphism

Question 12

Which concept is NOT a fundamental principle of object-oriented programming (OOP)?

Accepted Answer

Imperative programming

Answer

Encapsulation

Answer

Polymorphism

Answer

Inheritance

Question 13

Which of the following is NOT a fundamental principle of object-oriented programming?

Accepted Answer

Aggregation

Answer

Encapsulation

Answer

Inheritance

Answer

Polymorphism

Question 14

Which of the following is not a core principle of object-oriented programming?

Accepted Answer

Global state

Answer

Encapsulation

Answer

Inheritance

Answer

Polymorphism

Question 15

In object-oriented programming, which principle emphasizes concealing data within objects?

Accepted Answer

Data hiding

Answer

Global variables

Answer

Spaghetti code

Answer

Top-down design

Question 16

Which of the following is not a fundamental pillar of object-oriented programming?

Accepted Answer

Decomposition

Answer

Encapsulation

Answer

Inheritance

Answer

Polymorphism

Question 17

Which of the following is NOT a fundamental principle of object-oriented programming?

Accepted Answer

Modularity

Answer

Encapsulation

Answer

Inheritance

Answer

Polymorphism

Question 18

In object-oriented programming, what is the main goal of encapsulation?

Accepted Answer

Hiding implementation details while providing a clear interface

Answer

Allowing unrestricted access to an object's data and methods

Answer

Enabling multiple inheritance to combine properties and methods

Answer

Encouraging tight coupling between objects

Question 19

Which of the following is NOT a fundamental principle of object-oriented programming?

Accepted Answer

Recursion

Answer

Encapsulation

Answer

Inheritance

Answer

Polymorphism

Question 20

In Java, which statement best describes the relationship between an interface and its implementing class?

Accepted Answer

A class can implement multiple interfaces, but an interface cannot inherit from multiple classes.

Answer

An interface can inherit from a class, but a class cannot implement an interface.

Answer

Both a class and an interface can inherit from each other.

Answer

Neither a class nor an interface can inherit from or implement each other.

Question 21

In UML, which diagram type is used to show the static structure of a system, including the relationships between classes?

Accepted Answer

Class diagram

Answer

Activity diagram

Answer

Sequence diagram

Answer

Use case diagram

Question 22

In object-oriented programming, what is the main purpose of a class diagram?

Accepted Answer

To represent the static structure of a system by showing relationships between classes and their attributes.

Answer

To show how objects interact and behave during runtime.

Answer

To define the methods and their parameters within a class.

Answer

To specify the algorithms and data structures used within a class.

Question 23

Which of the following is a characteristic, but not a principle, of Object-Oriented Programming (OOP)?

Accepted Answer

Code reusability

Answer

Encapsulation

Answer

Inheritance

Answer

Polymorphism

Question 24

Which of the following is **not** a fundamental principle of object-oriented programming?

Accepted Answer

Concurrency

Answer

Encapsulation

Answer

Inheritance

Answer

Polymorphism

Question 25

In object-oriented programming, which feature allows data to be hidden from other parts of the program?

Accepted Answer

Encapsulation

Answer

Global variables

Answer

Top-down design

Question 26

In Java, what is the main purpose of the 'this' keyword within a method?

Accepted Answer

Reference the current object instance of the class.

Answer

Reference the parent class of the current class.

Answer

Reference a static method of the current class.

Question 27

Which of the following is NOT a potential benefit of using object-oriented programming?

Accepted Answer

Guaranteed reduction in code complexity

Answer

Encapsulation of data and methods

Answer

Increased flexibility through inheritance and polymorphism

Answer

Potential reduction in development time through code reuse

Question 28

In object-oriented programming, which concept allows you to create new classes based on existing ones, enabling code reuse?

Accepted Answer

Inheritance

Answer

Encapsulation

Answer

Polymorphism

Answer

Abstraction

Question 29

For a system that needs to process a large number of objects, which design approach is likely to provide the best performance?

Accepted Answer

Multiple smaller classes with clear responsibilities

Answer

A single large class containing all functionality

Answer

Avoiding inheritance to simplify the code

Answer

Combining procedural and object-oriented programming techniques

Question 30

In Object-Oriented Programming (OOP), which concept enables objects of different classes to respond to the same message in a unique way?

Accepted Answer

Polymorphism

Answer

Encapsulation

Answer

Inheritance

Answer

Abstraction

Question 31

Which of the following is NOT an advantage of inheritance in OOP?

Accepted Answer

Increased code complexity

Answer

Code reusability

Answer

Reduced coupling

Answer

Automatic memory management

Question 32

Which access modifier allows subclasses to access private members of the superclass?

Accepted Answer

protected

Answer

public

Answer

private

Answer

default

Question 33

What is the primary purpose of an interface in OOP?

Accepted Answer

To define a contract that classes must implement

Answer

To provide a concrete implementation of a behaviour

Answer

To inherit functionality from a parent class

Answer

To instantiate objects

Question 34

Which design principle promotes the creation of classes with a single, well-defined responsibility?

Accepted Answer

Single Responsibility Principle

Answer

Open-Closed Principle

Answer

Liskov Substitution Principle

Answer

Interface Segregation Principle

Question 35

Which of the following is a fundamental aspect of encapsulation in OOP?

Accepted Answer

Hiding data implementation details from external access

Answer

Allowing unrestricted access to private data

Answer

Providing public methods to modify private data

Answer

Encouraging direct manipulation of internal data

Question 36

What is the term for converting a derived class object back to its base class?

Accepted Answer

Upcasting

Answer

Downcasting

Answer

Casting

Answer

Conversion

Question 37

Which type of polymorphism allows operators to be overloaded to perform varying operations on dissimilar data types?

Accepted Answer

Operator polymorphism

Answer

Compile-time polymorphism

Answer

Runtime polymorphism

Answer

Method polymorphism

Question 38

Which design principle advocates for using interfaces instead of concrete classes?

Accepted Answer

SOLID

Answer

KISS

Answer

DRY

Answer

YAGNI

Question 39

Which of the following is a disadvantage of using inheritance in OOP?

Accepted Answer

Increased code complexity

Answer

Reduced code reusability

Answer

Limited extensibility

Answer

Improved encapsulation

Question 40

Which design pattern ensures that a class has only one instance?

Accepted Answer

Singleton

Answer

Factory

Answer

Observer

Answer

Strategy

Question 41

Which of the following is **not** a core principle of object-oriented programming (OOP)?

Accepted Answer

Concurrency

Answer

Encapsulation

Answer

Abstraction

Answer

Modularity

Question 42

Method overriding is used to:

Accepted Answer

Provide different implementations of a method in derived classes

Answer

Hide the implementation of a method in a derived class

Answer

Prevent access to a method in a derived class

Answer

Create a new method in a derived class with a different name

Question 43

Which design pattern defines a family hierarchy of classes and objects?

Accepted Answer

Composite

Answer

Factory method

Answer

Strategy

Answer

Observer

Question 44

Which access modifier is used to make a class member accessible only within the class itself?

Accepted Answer

private

Answer

public

Answer

protected

Answer

internal

Question 45

What is the primary purpose of a constructor in a class?

Accepted Answer

To initialize the state of an object when it is created

Answer

To define the methods that the class will have

Answer

To provide a means to access the class's private data

Answer

To create a new instance of the class without initializing its state

Question 46

A class is to an object as a:

Accepted Answer

Blueprint is to an instance

Answer

Instance is to a blueprint

Answer

Method is to a variable

Answer

Object is to a class

Question 47

Which of the following is **not** an advantage of using inheritance?

Accepted Answer

Improved performance

Answer

Code reusability

Answer

Reduced complexity

Answer

Increased polymorphism

Question 48

In Java, how do you create an instance of the `BankAccount` class named `account`?

Accepted Answer

`account = new BankAccount();`

Answer

`BankAccount account;`

Answer

`new BankAccount(account);`

Question 49

Which design pattern is commonly used to create a graphical user interface (GUI) that offers a consistent user experience?

Accepted Answer

MVC (Model-View-Controller)

Answer

Strategy

Answer

Observer

Answer

Factory Method

Question 50

Which of the following is NOT a benefit of using inheritance in object-oriented programming?

Accepted Answer

Increased code complexity

Answer

Improved maintainability

Answer

Reduced development time

Answer

Code reusability

Question 51

What is the primary purpose of the 'this' keyword in Java?

Accepted Answer

To refer to the current object

Answer

To access static methods

Answer

To pass arguments to a method

Answer

To create a new object

Question 52

Which design pattern is commonly used to provide a consistent interface to a set of related objects?

Accepted Answer

Facade

Answer

Singleton

Answer

Strategy

Question 53

What is the fundamental difference between a class and an object in object-oriented programming?

Accepted Answer

A class is a blueprint for creating objects, while an object is an instance of a class

Answer

A class is static, while an object is dynamic

Answer

A class contains data, while an object contains methods

Question 54

What is the main objective of encapsulation in object-oriented programming?

Accepted Answer

To protect the internal state of an object from unauthorized access

Answer

To increase performance

Answer

To enforce data consistency

Answer

To improve code readability

Question 55

Which of the following is a key characteristic of a well-structured object-oriented program?

Accepted Answer

High cohesion and low coupling

Answer

Extensive use of global variables

Answer

Complex class hierarchies

Answer

Deep inheritance

Question 56

In Java, declare a public class correctly:

Accepted Answer

public class ClassName { }

Answer

public ClassName { }

Answer

class public ClassName { }

Answer

ClassName public { }

Question 57

What is the primary purpose of inheritance in OOP?

Accepted Answer

To enable code reuse and simplify maintenance

Answer

To enhance security measures

Answer

To improve program performance

Question 58

Which benefit do design patterns offer in OOP?

Accepted Answer

They promote code quality and maintainability

Answer

They reduce code readability

Answer

They increase development time

Answer

They introduce security vulnerabilities

Question 59

Which is NOT a responsibility of a constructor in OOP?

Accepted Answer

Terminating the program

Answer

Assigning values to instance variables

Answer

Initialising object state

Answer

Establishing relationships between objects

Question 60

In Java, what is the correct syntax to create a package?

Accepted Answer

package com.example;

Answer

example package com;

Answer

com.example package;

Answer

package example.com;

Question 61

Which of the following is not classified as a pillar of Object-Oriented Programming?

Accepted Answer

Concurrency

Answer

Polymorphism

Answer

Encapsulation

Answer

Modularity

Question 62

Consider the following Java code:

```
class Animal {
    //...
}

class Dog extends Animal {
    //...
}

```

Which statement accurately describes the relationship between the classes?

Accepted Answer

Dog is a subtype of Animal, inheriting its properties and behavior.

Answer

Dog is a type of Animal, with no inheritance relationship.

Answer

Animal and Dog are unrelated classes.

Answer

Animal is a subtype of Dog, gaining access to Dog's properties.

Question 63

Which design pattern is commonly used to ensure that only one instance of a class is ever created?

Accepted Answer

Singleton

Answer

Builder

Answer

Factory

Question 64

Consider the following Python method:

```
def update_user(user_id, **kwargs):
    //...
```

What is the purpose of the **kwargs argument?

Accepted Answer

To accept an arbitrary number of keyword arguments as a dictionary.

Answer

To return a dictionary of the passed keyword arguments.

Answer

To restrict the method to only accept specific keyword arguments.