Explore topic-wise MCQs in C Sharp Programming.

This section includes 44 Mcqs, each offering curated multiple-choice questions to sharpen your C Sharp Programming knowledge and support exam preparation. Choose a topic below to get started.

1.

Which of the following statements are correct about the C#.NET code snippet given below? namespace IndiabixConsoleApplication { class index { protected int count; public index() { count = 0; } } class index1: index { public void increment() { count = count +1; } } class MyProgram { static void Main(string[] args) { index1 i = new index1(); i.increment(); } } }count should be declared as public if it is to become available in the inheritance chain. count should be declared as protected if it is to become available in the inheritance chain. While constructing an object referred to by i firstly constructor of index class will be called followed by constructor of index1 class. Constructor of index class does not get inherited in index1 class. count should be declared as Friend if it is to become available in the inheritance chain.

A. 1, 2, 5
B. 2, 3, 4
C. 3, 5
D. 4, 5
E. None of these
Answer» C. 3, 5
Discussion
2.

How can you make the private members inheritable?

A. By making their visibility mode as public only
B. By making their visibility mode as protected only
C. By making their visibility mode as private in derived class
D. It can be done both by making the visibility mode public or protected
Answer» E.
Discussion
3.

The private members of the base class are visible in derived class but are not accessible directly.

A. True
B. False
Answer» B. False
Discussion
4.

If a derived class object is created, which constructor is called first?

A. Base class constructor
B. Derived class constructor
C. Depends on how we call the object
D. Not possible
Answer» B. Derived class constructor
Discussion
5.

While inheriting a class, if no access mode is specified, then which among the following is true? (in C++)

A. It gets inherited publicly by default
B. It gets inherited protected by default
C. It gets inherited privately by default
D. It is not possible
Answer» D. It is not possible
Discussion
6.

Members which are not intended to be inherited are declared as ________________

A. Public members
B. Protected members
C. Private members
D. Private or Protected members
Answer» D. Private or Protected members
Discussion
7.

If a base class is inherited in protected access mode then which among the following is true?

A. Public and Protected members of base class becomes protected members of derived class
B. Only protected members become protected members of derived class
C. Private, Protected and Public all members of base, become private of derived class
D. Only private members of base, become private of derived class
Answer» B. Only protected members become protected members of derived class
Discussion
8.

Which access type data gets derived as private member in derived class?

A. Private
B. Public
C. Protected
D. Protected and Private
Answer» B. Public
Discussion
9.

Which type of inheritance leads to diamond problem?

A. Single level
B. Multi-level
C. Multiple
D. Hierarchical
Answer» D. Hierarchical
Discussion
10.

Which is the correct syntax of inheritance?

A. class derived_classname : base_classname{ /*define class body*/ };
B. class base_classname : derived_classname{ /*define class body*/ };
C. class derived_classname : access base_classname{ /*define class body*/ };
D. class base_classname :access derived_classname{ /*define class body*/ };
Answer» D. class base_classname :access derived_classname{ /*define class body*/ };
Discussion
11.

Which among the following is correct for a hierarchical inheritance?

A. Two base classes can be used to be derived into one single class
B. Two or more classes can be derived into one class
C. One base class can be derived into other two derived classes or more
D. One base class can be derived into only 2 classes
Answer» D. One base class can be derived into only 2 classes
Discussion
12.

Which programming language doesn’t support multiple inheritance?

A. C++ and Java
B. C and C++
C. Java and SmallTalk
D. Java
Answer» E.
Discussion
13.

Which among the following is correct for multiple inheritance?

A. class student{public: int marks;}s; class stream{int total;}; class topper:public student, public stream{ };
B. class student{int marks;}; class stream{ }; class topper: public student{ };
C. class student{int marks;}; class stream:public student{ };
D. class student{ }; class stream{ }; class topper{ };
Answer» B. class student{int marks;}; class stream{ }; class topper: public student{ };
Discussion
14.

Which among the following best defines single level inheritance?

A. A class inheriting a derived class
B. A class inheriting a base class
C. A class inheriting a nested class
D. A class which gets inherited by 2 classes
Answer» C. A class inheriting a nested class
Discussion
15.

How many basic types of inheritance are provided as OOP feature?

A. 4
B. 3
C. 2
D. 1
Answer» B. 3
Discussion
16.

Which among the following best describes the Inheritance?

A. Copying the code already written
B. Using the code already written once
C. Using already defined functions in programming language
D. Using the data and functions into derived segment
Answer» E.
Discussion
17.

Creating a derived class from a base class requires fundamental changes to the base class.

A. 1
B.
Answer» C.
Discussion
18.

It is illegal to make objects of one class as members of another class.

A. 1
B.
Answer» B.
Discussion
19.

The size of a derived class object is equal to the sum of sizes of data members in base class and the derived class.

A. 1
B.
Answer» B.
Discussion
20.

A class D can be derived from a class C, which is derived from a class B, which is derived from a class A.

A. 1
B.
Answer» B.
Discussion
21.

Private members of base class cannot be accessed by derived class member functions or objects of derived class.

A. 1
B.
Answer» B.
Discussion
22.

If a base class and a derived class each include a member function with the same name, the member function of the derived class will be called by an object of the derived class

A. 1
B.
Answer» B.
Discussion
23.

If a base class contains a member function func(), and a derived class does not contain a function with this name, an object of the derived class cannot access func().

A. 1
B.
C. 1
D.
Answer» C. 1
Discussion
24.

We can derive a class from a base class even if the base class's source code is not available.

A. 1
B.
Answer» B.
Discussion
25.

Which of the following are reuse mechanisms available in C#.NET? Inheritance Encapsulation Templates Containership Polymorphism

A. 1, 4
B. 1, 3
C. 2, 4
D. 3, 5
Answer» B. 1, 3
Discussion
26.

Which of the following statements are correct about Inheritance in C#.NET? A derived class object contains all the base class data. Inheritance cannot suppress the base class functionality. A derived class may not be able to access all the base class data. Inheritance cannot extend the base class functionality. In inheritance chain construction of object happens from base towards derived.

A. 1, 2, 4
B. 2, 4, 5
C. 1, 3, 5
D. 2, 4
Answer» D. 2, 4
Discussion
27.

An object of a derived class cannot access private members of base class.

A. 1
B.
Answer» B.
Discussion
28.

Which of the following is correct about the C#.NET snippet given below? namespace IndiabixConsoleApplication { class Baseclass { public void fun() { Console.WriteLine("Hi" + " "); } public void fun(int i) { Console.Write("Hello" + " "); } } class Derived: Baseclass { public void fun() { Console.Write("Bye" + " "); } } class MyProgram { static void Main(string[ ] args) { Derived d; d = new Derived(); d.fun(); d.fun(77); } } }

A. The program gives the output as: Hi Hello Bye
B. The program gives the output as: Bye Hello
C. The program gives the output as: Hi Bye Hello
D. Error in the program
Answer» C. The program gives the output as: Hi Bye Hello
Discussion
29.

Assume class B is inherited from class A. Which of the following statements is correct about construction of an object of class B?

A. While creating the object firstly the constructor of class B will be called followed by constructor of class A.
B. While creating the object firstly the constructor of class A will be called followed by constructor of class B.
C. The constructor of only class B will be called.
D. The constructor of only class A will be called.
Answer» C. The constructor of only class B will be called.
Discussion
30.

There is no private or protected inheritance in C#.NET.

A. 1
B.
Answer» B.
Discussion
31.

In an inheritance chain which of the following members of base class are accessible to the derived class members? static protected private shared public

A. 1, 3
B. 2, 5
C. 3, 4
D. 4, 5
Answer» C. 3, 4
Discussion
32.

The way a derived class member function can access base class public members, the base class member functions can access public member functions of derived class.

A. 1
B.
Answer» C.
Discussion
33.

Which of the following statements is correct about the C#.NET program given below? namespace IndiabixConsoleApplication { class Baseclass { int i; public Baseclass(int ii) { i = ii; Console.Write("Base "); } } class Derived : Baseclass { public Derived(int ii) : base(ii) { Console.Write("Derived "); } } class MyProgram { static void Main(string[ ] args) { Derived d = new Derived(10); } } }

A. The program will work correctly only if we implement zero-argument constructors in Baseclass as well as Derived class.
B. The program will output: Derived Base
C. The program will report an error in the statement base(ii).
D. The program will work correctly if we replace base(ii) with base.Baseclass(ii).
Answer» E.
Discussion
34.

Which of the following should be used to implement a 'Has a' relationship between two entities?

A. Polymorphism
B. Templates
C. Containership
D. Encapsulation
Answer» D. Encapsulation
Discussion
35.

There is no multiple inheritance in C#.NET. That is, a class cannot be derived from multiple base classes.

A. 1
B.
C. 1
D.
Answer» B.
Discussion
36.

How can you prevent inheritance from a class in C#.NET ?

A. Declare the class as shadows.
B. Declare the class as overloads.
C. Declare the class as sealed.
D. Declare the class as suppress.
Answer» D. Declare the class as suppress.
Discussion
37.

Which of the following statements are correct about the C#.NET code snippet given below? namespace IndiabixConsoleApplication { class index { protected int count; public index() { count = 0; } } class index1: index { public void increment() { count = count +1; } } class MyProgram { static void Main(string[] args) { index1 i = new index1(); i.increment(); } } } count should be declared as public if it is to become available in the inheritance chain. count should be declared as protected if it is to become available in the inheritance chain. While constructing an object referred to by i firstly constructor of index class will be called followed by constructor of index1 class. Constructor of index class does not get inherited in index1 class. count should be declared as Friend if it is to become available in the inheritance chain.

A. 1, 2, 5
B. 2, 3, 4
C. 3, 5
D. 4, 5
Answer» C. 3, 5
Discussion
38.

Which statement will you add in the function fun() of class B, if it is to produce the output "Welcome to IndiaBIX.com!"? namespace IndiabixConsoleApplication { class A { public void fun() { Console.Write("Welcome"); } } class B: A { public void fun() { // [*** Add statement here ***] Console.WriteLine(" to IndiaBIX.com!"); } } class MyProgram { static void Main (string[ ] args) { B b = new B(); b.fun(); } } }

A. base.fun();
B. A::fun();
C. fun();
D. mybase.fun();
Answer» B. A::fun();
Discussion
39.

Which of the following should be used to implement a 'Like a' or a 'Kind of' relationship between two entities?

A. Polymorphism
B. Containership
C. Templates
D. Encapsulation
Answer» E.
Discussion
40.

Multiple inheritance is different from multiple levels of inheritance.

A. 1
B.
C. 1
D.
Answer» B.
Discussion
41.

What will be the output of the C#.NET code snippet given below? namespace IndiabixConsoleApplication { class Baseclass { public void fun() { Console.Write("Base class" + " "); } } class Derived1: Baseclass { new void fun() { Console.Write("Derived1 class" + " "); } } class Derived2: Derived1 { new void fun() { Console.Write("Derived2 class" + " "); } } class Program { public static void Main(string[ ] args) { Derived2 d = new Derived2(); d.fun(); } } }

A. Base class
B. Derived1 class
C. Derived2 class
D. Base class Derived1 class
Answer» B. Derived1 class
Discussion
42.

What will be the size of the object created by the following C#.NET code snippet? namespace IndiabixConsoleApplication { class Baseclass { private int i; protected int j; public int k; } class Derived: Baseclass { private int x; protected int y; public int z; } class MyProgram { static void Main (string[ ] args) { Derived d = new Derived(); } } }

A. 24 bytes
B. 12 bytes
C. 20 bytes
D. 10 bytes
Answer» B. 12 bytes
Discussion
43.

Which of the following statements should be added to the subroutine fun( ) if the C#.NET code snippet given below is to output 9 13? class BaseClass { protected int i = 13; } class Derived: BaseClass { int i = 9; public void fun() { // [*** Add statement here ***] } }

A. Console.WriteLine(base.i + " " + i);
B. Console.WriteLine(i + " " + base.i);
C. Console.WriteLine(mybase.i + " " + i);
D. Console.WriteLine(i + " " + mybase.i);
Answer» C. Console.WriteLine(mybase.i + " " + i);
Discussion
44.

Which of the following can be facilitated by the Inheritance mechanism? Use the existing functionality of base class. Overrride the existing functionality of base class. Implement new functionality in the derived class. Implement polymorphic behaviour. Implement containership.

A. 1, 2, 3
B. 3, 4
C. 2, 4, 5
D. 3, 5
Answer» B. 3, 4
Discussion