Welcome to the Interfaces,Inheritance and Polymorphism MCQs Page

Dive deep into the fascinating world of Interfaces,Inheritance and Polymorphism with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Interfaces,Inheritance and Polymorphism, a crucial aspect of C# programming. In this section, you will encounter a diverse range of MCQs that cover various aspects of Interfaces,Inheritance and Polymorphism, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within C# programming.

Check out the MCQs below to embark on an enriching journey through Interfaces,Inheritance and Polymorphism. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of C# programming.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Interfaces,Inheritance and Polymorphism. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Interfaces,Inheritance and Polymorphism MCQs | Page 4 of 20

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01

Basics of C# Programming

02

Data Types,Variables and Operators

03

Control Instructions

04

Classes and Objects

05

Arrays and Strings

06

Functions and Subroutines

07

Indexers and Exception Handling

08

Console IO and Stream Classes

09

Delegates and Generics

10

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11

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Miscellaneous Topics

Q31.

Which of the following unary operators can be overloaded?

1. true
2. false
3. +
4. new
5. is

1, 2, 3

3, 4, 5

3 only

5 only

Discuss

Answer: (a).1, 2, 3

Q32.

A derived class can stop virtual inheritance by declaring an override as

inherits

extends

inheritable

not inheritable

Discuss

Answer: (b).sealed

Q33.

Which of the following keyword is used to change the data and behavior of a base class by replacing a member of a base class with a new derived member?

new

base

overloads

override

Discuss

Answer: (a).new

Q34.

Which of the following statements is correct?

When used as a modifier, the new keyword explicitly hides a member inherited from a base class.

Operator overloading works in different ways for structures and classes.

It is not necessary that all operator overloads are static methods of the class.

The cast operator can be overloaded.

Discuss

Answer: (a).When used as a modifier, the new keyword explicitly hides a member inherited from a base class.

Q35.

Which of the following keyword is used to overload user-defined types by defining static member functions?

opoverload

operator

operatoroverload

Discuss

Answer: (c).operator

Q36.

Which of the followings is the correct way to overload + operator?

public sample operator + ( sample a, sample b )

public abstract operator + ( sample a, sample b)

public abstract sample operator + (sample a, sample b )

public static sample operator + ( sample a, sample b )

Discuss

Answer: (d).public static sample operator + ( sample a, sample b )

Q37.

Which of the following statements is correct?

Static methods can be a virtual method.

Abstract methods can be a virtual method.

It is necessary to override a virtual method.

When overriding a method, the names and type signatures of the override method must be the same as the virtual method that is being overriden.

Discuss

Answer: (d).When overriding a method, the names and type signatures of the override method must be the same as the virtual method that is being overriden.

Q38.

Which of the following statements are correct?

1. All operators in C#.NET can be overloaded.
2. We can use the new modifier to modify a nested type if the nested type is hiding another type.
3. In case of operator overloading all parameters must be of the different type than the class or struct that declares the operator.
4. Method overloading is used to create several methods with the same name that performs similar tasks on similar data types.
5. Operator overloading permits the use of symbols to represent computations for a type.

1, 3

2, 4

2, 5

3, 4

Discuss

Answer: (c).2, 5

Q39.

Which of the following statement is correct about the C#.NET code snippet given below?


public class Sample
{
    public int x;
    public virtual void fun()
    { }
}
public class DerivedSample : Sample
{
    new public void fun()
    { }
}

DerivedSample class hides the fun() method of base class.

The DerivedSample class version of fun() method gets called using Sample class reference which holds DerivedSample class object.

The code replaces the DerivedSample class version of fun() method with its Sample class version.

It is not possible to hide Sample class version of fun() method without use of new in DerivedSample class.

Discuss

Answer: (a).DerivedSample class hides the fun() method of base class.

Q40.

Which of the following statements is correct?

The conditional logical operators cannot be overloaded.

When a binary operator is overloaded the corresponding assignment operator, if any, must be explicitly overloaded.

We can use the default equality operator in an overloaded implementation of the equality operator.

A public or nested public reference type does not overload the equality operator.

Discuss

Answer: (a).The conditional logical operators cannot be overloaded.

Page 4 of 20

Welcome to the Interfaces,Inheritance and Polymorphism MCQs Page

Interfaces,Inheritance and Polymorphism MCQs | Page 4 of 20

Explore more Topics under C# programming

Basics of C# Programming

Data Types,Variables and Operators

Control Instructions

Classes and Objects

Arrays and Strings

Functions and Subroutines

Indexers and Exception Handling

Console IO and Stream Classes

Delegates and Generics

LINQ

Collection Classes and Mathematical Functions

Namespaces and Preprocessors

Miscellaneous Topics

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