C# Inheritance Questions with Answers | Page 2

C# Inheritance questions with answers are key for understanding object-oriented programming concepts in C#. Inheritance allows one class to acquire properties and methods of another, promoting code reusability and modular design. These programming questions and answers with explanations are often featured in technical interview Q&A for companies like Microsoft, Cognizant, and TCS. Practicing C# MCQs on inheritance helps learners grasp concepts like base and derived classes, access modifiers, method overriding, and polymorphism. Regular practice using C# programming interview questions with answers ensures strong command over object-oriented design principles for both academic and professional success.

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Q11

What keyword is used to implement inheritance in C#?

A extends
B inherits
C implements
D colon (:)

Answer: Option D

Explanation: The colon (:) symbol is used to implement inheritance between classes in C#.

Q12

Which class cannot be inherited in C#?

A Abstract class
B Sealed class
C Static class
D Partial class

Answer: Option B

Explanation: Sealed classes are designed to prevent inheritance in C#.

Q13

What is the root class of all classes in C#?

A System
B Base
C Object
D Root

Answer: Option C

Explanation: Object class is the ultimate base class for all classes in the .NET Framework.

Q14

Which access modifier allows a member to be accessible only within its own class and derived classes?

A private
B public
C internal
D protected

Answer: Option D

Explanation: Protected members are accessible within the class and by derived class instances.

Q15

What keyword is used to call the base class constructor from a derived class?

A super
B this
C base
D parent

Answer: Option C

Explanation: The base keyword is used to call base class constructors and methods.

Q16

Which of the following is true about abstract classes?

A They can be instantiated
B They cannot have abstract methods
C They cannot be inherited
D They must be inherited to be used

Answer: Option D

Explanation: Abstract classes cannot be instantiated and must be inherited.

Q17

What is the main purpose of the "virtual" keyword in C#?

A To make method static
B To prevent method overriding
C To allow method overriding
D To make method private

Answer: Option C

Explanation: Virtual keyword allows methods to be overridden in derived classes.

Q18

Which keyword is used to override a method in a derived class?

A overrides
B new
C override
D virtual

Answer: Option C

Explanation: Override keyword explicitly indicates that a method is intended to override a base class method.

Q19

What happens if a class does not explicitly inherit from any class?

A It becomes a sealed class
B It inherits from Object class
C It causes compilation error
D It becomes an abstract class

Answer: Option B

Explanation: In C#, all classes implicitly inherit from Object class if no explicit inheritance is specified.

Q20

Which of the following can implement multiple inheritance in C#?

A Abstract classes
B Sealed classes
C Interfaces
D Static classes

Answer: Option C

Explanation: Interfaces allow a class to implement multiple inheritance in C#.

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