Question 1
Which statement is true about interfaces and abstract classes?
1
An abstract class can have both abstract and concrete methods
2
Interfaces can have constructors
3
Abstract classes cannot have concrete methods
4
Interfaces cannot be implemented by multiple classes
Question 2
What is the primary purpose of abstraction in Object-Oriented Programming (OOP)?
1
To hide implementation details and show only essential features
2
To make data more accessible
3
To provide direct access to data
4
To increase code complexity
Question 3
Which OOP principle is most closely related to abstraction?
1
Encapsulation
2
Inheritance
3
Polymorphism
4
None of the above
Question 4
What is the primary purpose of abstraction in Object-Oriented Programming (OOP)?
1
An abstract class must have at least one abstract method
2
An abstract class can have both abstract and non-abstract methods
3
An abstract class cannot have constructors
4
An abstract class can be instantiated
Question 5
What is the difference between abstraction and encapsulation?
1
Encapsulation is a subclass of abstraction
2
Abstraction protects data, while encapsulation hides implementation details
3
Abstraction hides implementation details, while encapsulation protects data
4
Both are the same
Question 6
Which of the following best describes an abstract method?
1
A method that is private and cannot be accessed
2
A method that cannot be inherited
3
A method that has no body and must be implemented in derived classes
4
A method that is final and cannot be overridden
Question 7
Which of the following is an advantage of using abstraction?
1
Increased code reusability
2
Reduced complexity
3
Easier maintenance and scalability
4
All of the above
Question 8
What is abstract class in C++?
1
Class specifically used as a base class with atleast one virtual functions
2
Class specifically used as a base class with atleast one pure virtual functions
3
Class from which any class is derived
4
Any Class in C++ is an abstract class
Question 9
What is an abstract class in Java?
1
A class that cannot be instantiated
2
A class that must contain at least one abstract method
3
A class that allows method overriding
4
All of the above
Question 10
Which of the following is true about abstract classes in C#?
1
Abstract classes must have at least one abstract method.
2
Interfaces and abstract classes are the same.
3
An abstract class can have concrete methods.
4
Abstract classes can be instantiated.
Question 11
What happens if a class contains at least one pure virtual function in C++?
1
It becomes an abstract class
2
It does not support polymorphism
3
It cannot have constructors
4
It can be instantiated normally
Question 12
What is the default behavior if a base class pointer points to a derived class object but does not use virtual functions in C++?
1
The base class method is called
2
The derived class method is called
3
Compilation error
4
Runtime error
Question 13
What will happen if a C++ derived class does not override a virtual function of the base class?
1
The base class function is called
2
The program crashes
3
Compilation error
4
Undefined behavior
5
Runtime Error
Question 14
What is Encapsulation in Object-Oriented Programming (OOP)?
1
Using multiple inheritance to combine functionalities
2
Hiding the implementation details and exposing only the necessary functionality
3
Writing all code in a single function
4
Allowing direct access to all data members of a class
Question 15
Which access specifier should be used to achieve Encapsulation in a class?
1
Private
2
Static
3
Protected
4
Public
Question 16
Which of the following statements is true regarding Encapsulation?
1
Encapsulation does not allow defining class members as private
2
Encapsulation helps in data abstraction and security
3
Encapsulation forces all class members to be static
4
Encapsulation is a way to achieve inheritance
Question 17
What is the primary difference between Encapsulation and Abstraction?
1
Encapsulation is not used in real-world applications, while abstraction is
2
Abstraction deals with private members only, while encapsulation does not
3
Encapsulation hides implementation details, while abstraction hides complexity
4
Encapsulation is only applicable to variables, while abstraction applies to methods
Question 18
How is abstraction implemented in Java?
1
Using static methods
2
Using instance variables
3
Using constructors
4
Using abstract classes and interfaces
Question 19
Which of the following statements about interfaces in Java is true?
1
A class can implement only one interface
2
An interface can have constructors
3
An interface supports multiple inheritance
4
An interface can have final methods
Question 20
What keyword is used to define an abstract class in C++?
1
abstract
2
interface
3
class
4
virtual
Question 21
Which concept allows abstraction in Python?
1
The @override decorator
2
The lambda function
3
The @abstractmethod decorator
4
The staticmethod decorator