OOps VB

Which of the following accurately defines "encapsulation" in object-oriented programming?

• a) Combining multiple classes into a single unit.

• b) Exposing implementation details to the user.

• c) Wrapping up data and methods into a single unit.

• d) Creating a hierarchy of objects

In Visual Basic .NET, what is the term for types that are built into the programming language and are not defined by the programmer?

• a) Abstract types

• b) Primitive types

• c) Custom types

• d) Complex types

What is the main difference between a reference type and a value type in Visual Basic .NET?

• a) Reference types are stored on the heap, while value types are stored on the stack.

• b) Reference types are stored on the stack, while value types are stored on the heap.

• c) Reference types are more efficient in terms of memory usage.

• d) Value types support inheritance, while reference types do not.

Which of the following access modifiers in Visual Basic .NET restricts access to the current class only?

• a) Public

• b) Private

• c) Protected

• d) Friend

What is the key difference between an abstract class and an interface in Visual Basic .NET?

• a) An abstract class can be instantiated, while an interface cannot.

• b) An interface can contain fields, while an abstract class cannot.

• c) An abstract class can provide method implementations, while an interface cannot.

• d) An interface can support multiple inheritance, while an abstract class cannot.

Which type of inheritance allows a class to inherit characteristics and behaviors from multiple interfaces?

• a) Single inheritance

• b) Multiple inheritance

• c) Hierarchical inheritance

• d) Multilevel inheritance

What is the purpose of "overriding" in Visual Basic .NET?

• a) To create new methods in the derived class

• b) To replace the implementation of a base class method in the derived class.

• c) To access private members of the base class.

• d) To prevent the inheritance of certain methods.

In Visual Basic .NET, what is the term for a function pointer that encapsulates a method and can be used to call that method indirectly?

• a) Class

• a) Interface

• c) Delegate

• d) Enum

What is the primary goal of abstraction in object-oriented programming?

• a) To expose implementation details to the user.

• b) To create complex data types.

• c) To provide a way to implement multiple interfaces.

• d) To hide implementation complexities from the user.

In Visual Basic .NET, which keyword is used to implement explicit interface implementation?

• a) Implements

• b) Overrides

• c) DirectCast

• d) Inherits