OOPS Quiz (Set 15) - Upskilling Engineers

OOPS (Set 15)

1 / 10

What is the difference between a final class and a sealed class?

A final class cannot be inherited from, while a sealed class can be inherited from, but only by classes in the same assembly

A final class must be abstract, while a sealed class can be concrete

A final class cannot be instantiated, while a sealed class can be instantiated

2 / 10

What is the difference between a static method and an instance method in terms of access control?

A static method can only be accessed through the object, while an instance method can be accessed through the class

A static method can only be accessed through the class, while an instance method can be accessed through the object

A static method is always public, while an instance method can be public, private, or protected

3 / 10

What is the difference between a polymorphism and an overloading?

Polymorphism is a type of overloading, where the different definitions of a method have the same name but different parameters

Polymorphism is the ability of an object to take on different forms, while overloading is the ability of a method to have multiple definitions

Overloading is a type of polymorphism, where the different definitions of a method have the same name but different return types

4 / 10

What is the difference between a has-a relationship and a has-many relationship?

A has-a relationship is a stronger relationship than a has-many relationship, because the child object cannot exist without the parent object

A has-a relationship is a relationship between two objects where one object has a reference to another object, while a has-many relationship is a relationship between two objects where one object has a reference to multiple objects

A has-many relationship is a stronger relationship than a has-a relationship, because the parent object can exist without the child object

5 / 10

What is the difference between a composition and an aggregation in terms of memory management?

In a composition, the child object is created when the parent object is created, while in an aggregation, the child object can be created independently of the parent object

In a composition, the child object cannot exist without the parent object, while in an aggregation, the child object can exist without the parent object

In a composition, the child object is stored in the memory of the parent object, while in an aggregation, the child object is not stored in the memory of the parent object

6 / 10

What is the difference between a final class and an abstract class?

A final class must be abstract, while an abstract class can be concrete

A final class cannot be inherited from, while an abstract class can be inherited from

A final class cannot be instantiated, while an abstract class can be instantiated

7 / 10

What is the difference between a constructor and a class method?

A constructor is a method that is declared in a class, while a class method is a method that is declared outside of a class

A constructor is a method that is called when an object is created, while a class method is a method that is called on a class

A constructor is a method that is used to initialize the data members of an object, while a class method is a method that is used to perform some operation on a class

8 / 10

What is the difference between a pure virtual method and an abstract method?

A pure virtual method is an abstract method that must be implemented by a derived class, while an abstract method is an abstract method that may or may not be implemented by a derived class

A pure virtual method is an abstract method that cannot be called, while an abstract method is an abstract method that can be called

A pure virtual method is an abstract method that is declared in a base class, while an abstract method is an abstract method that is declared in a derived class

9 / 10

What is the difference between a static method and a non-static method?

A static method is a method that can be called without creating an object of the class, while a non-static method is a method that can only be called by creating an object of the class

A static method is a method that is stored in the class itself, while a non-static method is a method that is stored in the object

A static method is a method that is called when an object is created, while a non-static method is a method that is called when an object is destroyed

10 / 10

What is the difference between a class variable and an instance variable?

A class variable is a variable that is declared inside a class, while an instance variable is a variable that is declared outside of any methods

A class variable is a variable that is accessible to all methods in a class, while an instance variable is a variable that is only accessible to the method it is declared in

A class variable is a variable that is accessible to all objects in a class, while an instance variable is a variable that is only accessible to the object that created it

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