C# Classes and Objects Questions with Answers | Programming | Page 2

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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Q11

Which of the following statements are correct about objects of a user-defined class called Sample?     All objects of Sample class will always have exactly same data.     Objects of Sample class may have same or different data.     Whether objects of Sample class will have same or different data depends upon a Project Setting made in Visual Studio.NET.     Conceptually, each object of Sample class will have instance data and instance member functions of the Sample class.     All objects of Sample class will share one copy of member functions.

A 1, 3
B 2, 4
C 4, 5
D 3, 5

Answer: Option C

Q12

Which of the following statements is correct about classes and objects in C#.NET?

A Class is a value type.
B Since objects are typically big in size, they are created on the stack.
C Objects of smaller size are created on the heap.
D Smaller objects that get created on the stack can be given names.

Answer: Option

Q13

Which keyword is used to define a class in C#?

A object
B class
C struct
D define

Answer: Option B

Explanation: Classes in C# are declared using the class keyword.

Q14

What is an instance of a class called?

A Object
B Method
C Field
D Property

Answer: Option A

Explanation: Objects are runtime instances of classes.

Q15

Which access modifier allows members to be visible only within the same class?

A public
B private
C protected
D internal

Answer: Option B

Explanation: Private members are accessible only within the class itself.

Q16

What is the entry point method for a C# program?

A Start()
B Execute()
C Main()
D Run()

Answer: Option C

Explanation: The Main() method is the starting point of execution.

Q17

Which keyword is used to create an object in C#?

A object
B create
C new
D instance

Answer: Option C

Explanation: The new keyword instantiates a class.

Q18

What is the default access modifier for class members in C#?

A public
B protected
C private
D internal

Answer: Option C

Explanation: Members inside a class are private unless otherwise specified.

Q19

Which of the following can be used to initialize class variables during object creation?

A Properties
B Constructors
C Methods
D Accessors

Answer: Option B

Explanation: Constructors run automatically when an object is created.

Q20

What happens if no constructor is defined in a class?

A The program fails to compile
B A default constructor is added by C#
C An error is thrown
D Nothing happens

Answer: Option B

Explanation: C# creates an implicit parameterless constructor.

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