C# Classes and Objects Questions with Answers | Programming | Page 3

Understanding Classes and Objects in C# is a core concept for anyone preparing for software development interviews. These programming questions and answers explore how object-oriented programming (OOP) principles like encapsulation, abstraction, and inheritance are applied in C#. You’ll learn how classes define structure and behavior, while objects represent real-world entities within programs. Such C# programming MCQs and interview questions are commonly asked in TCS, Accenture, Wipro, and Infosys technical rounds. Practicing these C# OOP questions with explanations improves coding efficiency and conceptual clarity, making it easier to crack programming assessments and placement tests. Start now with C# Classes and Objects questions with answers to strengthen your fundamentals.

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Q21

Which keyword refers to the current instance of a class?

A base
B this
C super
D self

Answer: Option B

Explanation: The this keyword points to the current object.

Q22

A class that cannot be instantiated directly is called a?

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

Answer: Option B

Explanation: Abstract classes require inheritance to be used.

Q23

Which of the following is used to prevent inheritance of a class?

A abstract
B sealed
C static
D final

Answer: Option B

Explanation: sealed keyword disallows further inheritance.

Q24

What is the process of combining data and methods into a class called?

A Polymorphism
B Inheritance
C Abstraction
D Encapsulation

Answer: Option D

Explanation: Encapsulation bundles data and methods together.

Q25

How can a class inherit another class in C#?

A Using extends
B Using base
C Using : symbol
D Using inherits

Answer: Option C

Explanation: Syntax is class B : A.

Q26

Which type of class cannot have instance members or constructors?

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

Answer: Option B

Explanation: Static classes hold only static members.

Q27

Which keyword is used to define a class inside another class?

A inner
B nested
C class
D sub

Answer: Option C

Explanation: Nested classes are declared like normal classes inside others.

Q28

Which of the following can a class contain?

A Fields and methods
B Constructors
C Properties
D All of the above

Answer: Option D

Explanation: Classes can include all these elements.

Q29

What is used to access a member of an object?

A , (comma)
B . (dot)
C -> (arrow)
D : (colon)

Answer: Option B

Explanation: The dot operator accesses members.

Q30

Which of these cannot be accessed using an object of a class?

A Static members
B Instance members
C Properties
D Methods

Answer: Option A

Explanation: Static members are accessed using the class name.

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